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CompTIA Network+ N10-009 OSI Reference Model Practice Test

Objective 1.1 • 20 original questions

This CompTIA Network+ N10-009 practice test focuses on OSI reference model concepts. All questions are original ExamSnap scenarios aligned to the current N10-009 blueprint; they are not copied from CompTIA exam content. Use the complete N10-009 collection for broader practice across all five domains. For broader exam preparation, review the CompTIA Network+ N10-009 Exam Dumps page.

Instructions: Select the best answer for each question. Review the explanation after answering; each distractor includes a reason it is not the best choice for that scenario.

Question 1

At Litware Manufacturing, a systems administrator is reviewing a network change. The requirement is to focus on signaling, media, connectors, or link pulses rather than frames or addresses. Which option is the best fit? The decision applies to a branch-office rollout.

Layer 5 – Session
Layer 3 – Network
Layer 6 – Presentation
Layer 1 – Physical
Layer 4 – Transport

Correct answer: D

Why: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. This directly satisfies the requirement: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

Option review:

A: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

B: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

C: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

D: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. This directly satisfies the requirement: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

E: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

Learning point: Use Layer 1 – Physical when the key requirement is to focus on signaling, media, connectors, or link pulses rather than frames or addresses.

Question 2

A ticket at Woodgrove Bank says the team must identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link. Which technology or concept most directly addresses this requirement? The decision applies to a campus refresh.

Layer 5 – Session
Layer 7 – Application
Layer 4 – Transport
Layer 6 – Presentation
Layer 2 – Data link

Correct answer: E

Why: Uses frames and MAC addressing for local-segment delivery and switching. This directly satisfies the requirement: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

Option review:

A: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

B: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

C: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

D: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

E: Uses frames and MAC addressing for local-segment delivery and switching. This directly satisfies the requirement: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

Learning point: Use Layer 2 – Data link when the key requirement is to identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

Question 3

During a design meeting at Blue Yonder Airlines, the junior network administrator needs to identify the layer responsible for IP addressing and routing between subnets. What should be selected? The decision applies to a data-center segment.

Layer 5 – Session
Layer 3 – Network
Layer 7 – Application
Layer 4 – Transport
Layer 2 – Data link

Correct answer: B

Why: Uses logical addressing and routing to move packets between networks. This directly satisfies the requirement: identify the layer responsible for IP addressing and routing between subnets.

Option review:

A: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: identify the layer responsible for IP addressing and routing between subnets.

B: Uses logical addressing and routing to move packets between networks. This directly satisfies the requirement: identify the layer responsible for IP addressing and routing between subnets.

C: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: identify the layer responsible for IP addressing and routing between subnets.

D: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: identify the layer responsible for IP addressing and routing between subnets.

E: Uses frames and MAC addressing for local-segment delivery and switching. However, it does not most directly satisfy the requirement in this scenario: identify the layer responsible for IP addressing and routing between subnets.

Learning point: Use Layer 3 – Network when the key requirement is to identify the layer responsible for IP addressing and routing between subnets.

Question 4

Contoso Health is updating its network standard. Which option best meets the need to identify the layer associated with TCP/UDP ports and end-to-end transport? The decision applies to a remote-site migration.

Layer 7 – Application
Layer 1 – Physical
Layer 5 – Session
Layer 6 – Presentation
Layer 4 – Transport

Correct answer: E

Why: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. This directly satisfies the requirement: identify the layer associated with TCP/UDP ports and end-to-end transport.

Option review:

A: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with TCP/UDP ports and end-to-end transport.

B: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with TCP/UDP ports and end-to-end transport.

C: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with TCP/UDP ports and end-to-end transport.

E: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. This directly satisfies the requirement: identify the layer associated with TCP/UDP ports and end-to-end transport.

Learning point: Use Layer 4 – Transport when the key requirement is to identify the layer associated with TCP/UDP ports and end-to-end transport.

Question 5

A field technician at Litware Manufacturing is validating a proposed solution. The design must identify the layer concerned with maintaining an application communication session. Which answer is most appropriate? The decision applies to a operations lab.

Layer 1 – Physical
Layer 5 – Session
Layer 3 – Network
Layer 7 – Application
Layer 2 – Data link

Correct answer: B

Why: Establishes, manages, and tears down communication sessions between applications. This directly satisfies the requirement: identify the layer concerned with maintaining an application communication session.

Option review:

A: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. However, it does not most directly satisfy the requirement in this scenario: identify the layer concerned with maintaining an application communication session.

B: Establishes, manages, and tears down communication sessions between applications. This directly satisfies the requirement: identify the layer concerned with maintaining an application communication session.

C: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: identify the layer concerned with maintaining an application communication session.

D: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: identify the layer concerned with maintaining an application communication session.

E: Uses frames and MAC addressing for local-segment delivery and switching. However, it does not most directly satisfy the requirement in this scenario: identify the layer concerned with maintaining an application communication session.

Learning point: Use Layer 5 – Session when the key requirement is to identify the layer concerned with maintaining an application communication session.

Question 6

For a new deployment at Woodgrove Bank, the networking team wants to identify the layer associated with data format translation, encoding, or presentation. Which choice most directly satisfies the goal? The decision applies to a production maintenance window.

Layer 2 – Data link
Layer 6 – Presentation
Layer 5 – Session
Layer 4 – Transport
Layer 7 – Application

Correct answer: B

Why: Transforms data representation and commonly encompasses encryption/encoding functions. This directly satisfies the requirement: identify the layer associated with data format translation, encoding, or presentation.

Option review:

A: Uses frames and MAC addressing for local-segment delivery and switching. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with data format translation, encoding, or presentation.

B: Transforms data representation and commonly encompasses encryption/encoding functions. This directly satisfies the requirement: identify the layer associated with data format translation, encoding, or presentation.

D: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with data format translation, encoding, or presentation.

E: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with data format translation, encoding, or presentation.

Learning point: Use Layer 6 – Presentation when the key requirement is to identify the layer associated with data format translation, encoding, or presentation.

Question 7

At Blue Yonder Airlines, a systems administrator is reviewing a network change. The requirement is to identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed. Which option is the best fit? The decision applies to a new floor deployment.

Layer 1 – Physical
Layer 5 – Session
Layer 3 – Network
Layer 4 – Transport
Layer 7 – Application

Correct answer: E

Why: Provides network services directly to user-facing applications and application protocols. This directly satisfies the requirement: identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed.

Option review:

A: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. However, it does not most directly satisfy the requirement in this scenario: identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed.

B: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed.

C: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed.

D: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed.

E: Provides network services directly to user-facing applications and application protocols. This directly satisfies the requirement: identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed.

Learning point: Use Layer 7 – Application when the key requirement is to identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed.

Question 8

During a data-center segment, Contoso Health is comparing several networking concepts. Which option is accurately characterized by this statement: Carries raw bits as electrical, optical, or radio signals and covers media/connectors.

Layer 5 – Session
Layer 3 – Network
Layer 6 – Presentation
Layer 1 – Physical
Layer 4 – Transport

Correct answer: D

Why: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. This directly satisfies the requirement: Carries raw bits as electrical, optical, or radio signals and covers media/connectors..

Option review:

A: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: Carries raw bits as electrical, optical, or radio signals and covers media/connectors..

B: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: Carries raw bits as electrical, optical, or radio signals and covers media/connectors..

C: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: Carries raw bits as electrical, optical, or radio signals and covers media/connectors..

D: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. This directly satisfies the requirement: Carries raw bits as electrical, optical, or radio signals and covers media/connectors..

E: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: Carries raw bits as electrical, optical, or radio signals and covers media/connectors..

Learning point: Use Layer 1 – Physical when the key requirement is to focus on signaling, media, connectors, or link pulses rather than frames or addresses.

Question 9

During a remote-site migration, Litware Manufacturing is comparing several networking concepts. Which option is accurately characterized by this statement: Uses frames and MAC addressing for local-segment delivery and switching.

Layer 3 – Network
Layer 7 – Application
Layer 1 – Physical
Layer 2 – Data link
Layer 4 – Transport

Correct answer: D

Why: Uses frames and MAC addressing for local-segment delivery and switching. This directly satisfies the requirement: Uses frames and MAC addressing for local-segment delivery and switching..

Option review:

A: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: Uses frames and MAC addressing for local-segment delivery and switching..

B: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: Uses frames and MAC addressing for local-segment delivery and switching..

C: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. However, it does not most directly satisfy the requirement in this scenario: Uses frames and MAC addressing for local-segment delivery and switching..

D: Uses frames and MAC addressing for local-segment delivery and switching. This directly satisfies the requirement: Uses frames and MAC addressing for local-segment delivery and switching..

E: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: Uses frames and MAC addressing for local-segment delivery and switching..

Learning point: Use Layer 2 – Data link when the key requirement is to identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

Question 10

During a operations lab, Woodgrove Bank is comparing several networking concepts. Which option is accurately characterized by this statement: Uses logical addressing and routing to move packets between networks.

Layer 4 – Transport
Layer 2 – Data link
Layer 6 – Presentation
Layer 3 – Network
Layer 7 – Application

Correct answer: D

Why: Uses logical addressing and routing to move packets between networks. This directly satisfies the requirement: Uses logical addressing and routing to move packets between networks..

Option review:

A: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: Uses logical addressing and routing to move packets between networks..

B: Uses frames and MAC addressing for local-segment delivery and switching. However, it does not most directly satisfy the requirement in this scenario: Uses logical addressing and routing to move packets between networks..

C: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: Uses logical addressing and routing to move packets between networks..

D: Uses logical addressing and routing to move packets between networks. This directly satisfies the requirement: Uses logical addressing and routing to move packets between networks..

E: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: Uses logical addressing and routing to move packets between networks..

Learning point: Use Layer 3 – Network when the key requirement is to identify the layer responsible for IP addressing and routing between subnets.

Question 11

During a production maintenance window, Blue Yonder Airlines is comparing several networking concepts. Which option is accurately characterized by this statement: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior.

Layer 2 – Data link
Layer 3 – Network
Layer 7 – Application
Layer 4 – Transport
Layer 6 – Presentation

Correct answer: D

Why: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. This directly satisfies the requirement: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior..

Option review:

A: Uses frames and MAC addressing for local-segment delivery and switching. However, it does not most directly satisfy the requirement in this scenario: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior..

B: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior..

C: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior..

D: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. This directly satisfies the requirement: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior..

E: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior..

Learning point: Use Layer 4 – Transport when the key requirement is to identify the layer associated with TCP/UDP ports and end-to-end transport.

Question 12

During a new floor deployment, Contoso Health is comparing several networking concepts. Which option is accurately characterized by this statement: Establishes, manages, and tears down communication sessions between applications.

Layer 4 – Transport
Layer 5 – Session
Layer 1 – Physical
Layer 6 – Presentation
Layer 3 – Network

Correct answer: B

Why: Establishes, manages, and tears down communication sessions between applications. This directly satisfies the requirement: Establishes, manages, and tears down communication sessions between applications..

Option review:

A: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: Establishes, manages, and tears down communication sessions between applications..

B: Establishes, manages, and tears down communication sessions between applications. This directly satisfies the requirement: Establishes, manages, and tears down communication sessions between applications..

C: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. However, it does not most directly satisfy the requirement in this scenario: Establishes, manages, and tears down communication sessions between applications..

D: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: Establishes, manages, and tears down communication sessions between applications..

E: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: Establishes, manages, and tears down communication sessions between applications..

Learning point: Use Layer 5 – Session when the key requirement is to identify the layer concerned with maintaining an application communication session.

Question 13

During a service-recovery review, Litware Manufacturing is comparing several networking concepts. Which option is accurately characterized by this statement: Transforms data representation and commonly encompasses encryption/encoding functions.

Layer 4 – Transport
Layer 7 – Application
Layer 3 – Network
Layer 6 – Presentation
Layer 1 – Physical

Correct answer: D

Why: Transforms data representation and commonly encompasses encryption/encoding functions. This directly satisfies the requirement: Transforms data representation and commonly encompasses encryption/encoding functions..

Option review:

A: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: Transforms data representation and commonly encompasses encryption/encoding functions..

B: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: Transforms data representation and commonly encompasses encryption/encoding functions..

C: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: Transforms data representation and commonly encompasses encryption/encoding functions..

D: Transforms data representation and commonly encompasses encryption/encoding functions. This directly satisfies the requirement: Transforms data representation and commonly encompasses encryption/encoding functions..

E: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. However, it does not most directly satisfy the requirement in this scenario: Transforms data representation and commonly encompasses encryption/encoding functions..

Learning point: Use Layer 6 – Presentation when the key requirement is to identify the layer associated with data format translation, encoding, or presentation.

Question 14

During a branch-office rollout, Woodgrove Bank is comparing several networking concepts. Which option is accurately characterized by this statement: Provides network services directly to user-facing applications and application protocols.

Layer 2 – Data link
Layer 6 – Presentation
Layer 5 – Session
Layer 4 – Transport
Layer 7 – Application

Correct answer: E

Why: Provides network services directly to user-facing applications and application protocols. This directly satisfies the requirement: Provides network services directly to user-facing applications and application protocols..

Option review:

A: Uses frames and MAC addressing for local-segment delivery and switching. However, it does not most directly satisfy the requirement in this scenario: Provides network services directly to user-facing applications and application protocols..

B: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: Provides network services directly to user-facing applications and application protocols..

C: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: Provides network services directly to user-facing applications and application protocols..

D: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: Provides network services directly to user-facing applications and application protocols..

E: Provides network services directly to user-facing applications and application protocols. This directly satisfies the requirement: Provides network services directly to user-facing applications and application protocols..

Learning point: Use Layer 7 – Application when the key requirement is to identify the layer where protocols such as HTTP, DNS, and SMTP are typically discussed.

Question 15

A junior network administrator at Blue Yonder Airlines is troubleshooting a operations lab. The team has isolated the key need as follows: focus on signaling, media, connectors, or link pulses rather than frames or addresses. Which concept should be applied or investigated first?

Layer 6 – Presentation
Layer 5 – Session
Layer 1 – Physical
Layer 2 – Data link
Layer 4 – Transport

Correct answer: C

Option review:

A: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

B: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

C: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. This directly satisfies the requirement: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

D: Uses frames and MAC addressing for local-segment delivery and switching. However, it does not most directly satisfy the requirement in this scenario: focus on signaling, media, connectors, or link pulses rather than frames or addresses.

Learning point: Use Layer 1 – Physical when the key requirement is to focus on signaling, media, connectors, or link pulses rather than frames or addresses.

Question 16

A network technician at Contoso Health is troubleshooting a production maintenance window. The team has isolated the key need as follows: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link. Which concept should be applied or investigated first?

Layer 7 – Application
Layer 5 – Session
Layer 2 – Data link
Layer 3 – Network
Layer 1 – Physical

Correct answer: C

Option review:

B: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

C: Uses frames and MAC addressing for local-segment delivery and switching. This directly satisfies the requirement: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

D: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

E: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

Learning point: Use Layer 2 – Data link when the key requirement is to identify the layer associated with Ethernet frames, MAC addresses, or switching on the local link.

Question 17

A field technician at Litware Manufacturing is troubleshooting a new floor deployment. The team has isolated the key need as follows: identify the layer responsible for IP addressing and routing between subnets. Which concept should be applied or investigated first?

Layer 3 – Network
Layer 5 – Session
Layer 1 – Physical
Layer 7 – Application
Layer 6 – Presentation

Correct answer: A

Why: Uses logical addressing and routing to move packets between networks. This directly satisfies the requirement: identify the layer responsible for IP addressing and routing between subnets.

Option review:

A: Uses logical addressing and routing to move packets between networks. This directly satisfies the requirement: identify the layer responsible for IP addressing and routing between subnets.

B: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: identify the layer responsible for IP addressing and routing between subnets.

C: Carries raw bits as electrical, optical, or radio signals and covers media/connectors. However, it does not most directly satisfy the requirement in this scenario: identify the layer responsible for IP addressing and routing between subnets.

D: Provides network services directly to user-facing applications and application protocols. However, it does not most directly satisfy the requirement in this scenario: identify the layer responsible for IP addressing and routing between subnets.

E: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: identify the layer responsible for IP addressing and routing between subnets.

Learning point: Use Layer 3 – Network when the key requirement is to identify the layer responsible for IP addressing and routing between subnets.

Question 18

A network support specialist at Woodgrove Bank is troubleshooting a service-recovery review. The team has isolated the key need as follows: identify the layer associated with TCP/UDP ports and end-to-end transport. Which concept should be applied or investigated first?

Layer 3 – Network
Layer 5 – Session
Layer 4 – Transport
Layer 2 – Data link
Layer 7 – Application

Correct answer: C

Option review:

A: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with TCP/UDP ports and end-to-end transport.

B: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with TCP/UDP ports and end-to-end transport.

C: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. This directly satisfies the requirement: identify the layer associated with TCP/UDP ports and end-to-end transport.

D: Uses frames and MAC addressing for local-segment delivery and switching. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with TCP/UDP ports and end-to-end transport.

Learning point: Use Layer 4 – Transport when the key requirement is to identify the layer associated with TCP/UDP ports and end-to-end transport.

Question 19

A systems administrator at Blue Yonder Airlines is troubleshooting a branch-office rollout. The team has isolated the key need as follows: identify the layer concerned with maintaining an application communication session. Which concept should be applied or investigated first?

Layer 1 – Physical
Layer 3 – Network
Layer 4 – Transport
Layer 5 – Session
Layer 6 – Presentation

Correct answer: D

Option review:

B: Uses logical addressing and routing to move packets between networks. However, it does not most directly satisfy the requirement in this scenario: identify the layer concerned with maintaining an application communication session.

C: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: identify the layer concerned with maintaining an application communication session.

D: Establishes, manages, and tears down communication sessions between applications. This directly satisfies the requirement: identify the layer concerned with maintaining an application communication session.

E: Transforms data representation and commonly encompasses encryption/encoding functions. However, it does not most directly satisfy the requirement in this scenario: identify the layer concerned with maintaining an application communication session.

Learning point: Use Layer 5 – Session when the key requirement is to identify the layer concerned with maintaining an application communication session.

Question 20

A NOC analyst at Contoso Health is troubleshooting a campus refresh. The team has isolated the key need as follows: identify the layer associated with data format translation, encoding, or presentation. Which concept should be applied or investigated first?

Layer 2 – Data link
Layer 1 – Physical
Layer 6 – Presentation
Layer 5 – Session
Layer 4 – Transport

Correct answer: C

Option review:

C: Transforms data representation and commonly encompasses encryption/encoding functions. This directly satisfies the requirement: identify the layer associated with data format translation, encoding, or presentation.

D: Establishes, manages, and tears down communication sessions between applications. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with data format translation, encoding, or presentation.

E: Provides end-to-end transport using TCP/UDP ports, segmentation, and flow behavior. However, it does not most directly satisfy the requirement in this scenario: identify the layer associated with data format translation, encoding, or presentation.

Learning point: Use Layer 6 – Presentation when the key requirement is to identify the layer associated with data format translation, encoding, or presentation.

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