Cisco CCNA 200-301 TCP vs UDP Practice Test

Topic 05 focuses on TCP vs UDP for the Cisco Certified Network Associate (CCNA) certification and the 200-301 exam, using Cisco networking and Cisco IOS concepts where relevant. For broader exam preparation, review the Cisco CCNA 200-301 Exam Dumps page. Each question includes a concise explanation of the correct answer and the technical reason the other choices are incorrect.

Question 1

Which connection-oriented transport protocol provides sequencing, acknowledgments, retransmission, and flow control?

1. Acknowledgment
2. Transport checksum
3. TCP
4. Sequence number

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes a connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

Incorrect Answers

Answer A is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.

Answer B is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Answer D is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

 

Question 2

Which connectionless transport protocol with low overhead does not provide built-in delivery acknowledgment or retransmission?

1. Socket
2. Window size
3. UDP
4. Well-known port

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes a connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

Incorrect Answers

Answer A is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

Answer B is incorrect because the “Window size” option describes a different concept: a TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Answer D is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

 

Question 3

Which TCP connection-establishment exchange uses SYN, SYN-ACK, and ACK?

1. Retransmission
2. Three-way handshake
3. Well-known port
4. Transport checksum

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Incorrect Answers

Answer A is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

Answer C is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Answer D is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

 

Question 4

Which TCP mechanism is used by a receiver to confirm successful receipt of data?

1. Acknowledgment
2. Three-way handshake
3. Window size
4. Retransmission

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes a TCP mechanism used by a receiver to confirm successful receipt of data.

Incorrect Answers

Answer B is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer C is incorrect because the “Window size” option describes a different concept: a TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Answer D is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

 

Question 5

Which TCP field is used to order data and detect missing segments?

1. Sequence number
2. Retransmission
3. Transport checksum
4. Three-way handshake

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes a TCP field used to order data and detect missing segments.

Incorrect Answers

Answer B is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

Answer C is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Answer D is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

 

Question 6

Which TCP flow-control value indicates how much data may be sent before additional acknowledgment is required?

1. Window size
2. UDP
3. Well-known port
4. Sequence number

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes a TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Incorrect Answers

Answer B is incorrect because the “UDP” option describes a different concept: a connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

Answer C is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Answer D is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

 

Question 7

What is a TCP reliability action in which unacknowledged or missing data is sent again?

1. TCP
2. Socket
3. Transport checksum
4. Retransmission

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes a TCP reliability action in which unacknowledged or missing data is sent again.

Incorrect Answers

Answer A is incorrect because the “TCP” option describes a different concept: a connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

Answer B is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

Answer C is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

 

Question 8

Which field is used by TCP and UDP to detect corruption in the transport-layer segment or datagram?

1. UDP
2. Acknowledgment
3. Well-known port
4. Transport checksum

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Incorrect Answers

Answer A is incorrect because the “UDP” option describes a different concept: a connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

Answer B is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.

Answer C is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

 

Question 9

What is a transport-layer port in the range 0 through 1023 commonly assigned to standard network services?

1. Three-way handshake
2. Acknowledgment
3. Well-known port
4. Socket

Correct Answer: C

 

Correct Answer

Answer C is correct because the selected answer describes a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Incorrect Answers

Answer A is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer B is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.

Answer D is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

 

Question 10

What is a communication endpoint commonly identified by an IP address, transport protocol, and port number?

1. Socket
2. Well-known port
3. Acknowledgment
4. TCP

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes a communication endpoint commonly identified by an IP address, transport protocol, and port number.

Incorrect Answers

Answer B is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Answer C is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.

Answer D is incorrect because the “TCP” option describes a different concept: a connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

 

Question 11

For TCP, which statement is accurate?

1. A communication endpoint commonly identified by an IP address, transport protocol, and port number.
2. A connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.
3. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.
4. A TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Correct Answer: B

 

Correct Answer

Answer B is correct because it accurately defines TCP. The matching definition is: A connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

Incorrect Answers

Answer A is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

Answer C is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer D is incorrect because the “Window size” option describes a different concept: a TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

 

Question 12

For UDP, which statement is accurate?

1. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.
2. A connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.
3. A connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.
4. A TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Correct Answer: B

 

Correct Answer

Answer B is correct because the choice accurately describes UDP: A connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

Incorrect Answers

Answer A is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer C is incorrect because the “TCP” option describes a different concept: a connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

Answer D is incorrect because the “Window size” option describes a different concept: a TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

 

Question 13

For Three-way handshake, which statement is accurate?

1. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.
2. A TCP mechanism used by a receiver to confirm successful receipt of data.
3. A transport-layer port in the range 0 through 1023 commonly assigned to standard network services.
4. A TCP reliability action in which unacknowledged or missing data is sent again.

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Incorrect Answers

Answer B is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.

Answer C is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Answer D is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

 

Question 14

For Acknowledgment, which statement is accurate?

1. A field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.
2. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.
3. A connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.
4. A TCP mechanism used by a receiver to confirm successful receipt of data.

Correct Answer: D

 

Correct Answer

Answer D is correct because the selected answer describes a TCP mechanism used by a receiver to confirm successful receipt of data.

Incorrect Answers

Answer A is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Answer B is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer C is incorrect because the “UDP” option describes a different concept: a connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

 

Question 15

For Sequence number, which statement is accurate?

1. A communication endpoint commonly identified by an IP address, transport protocol, and port number.
2. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.
3. A TCP reliability action in which unacknowledged or missing data is sent again.
4. A TCP field used to order data and detect missing segments.

Correct Answer: D

 

Correct Answer

Answer D is correct because it accurately defines Sequence number. The matching definition is: A TCP field used to order data and detect missing segments.

Incorrect Answers

Answer A is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

Answer B is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer C is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

 

Question 16

For Window size, which statement is accurate?

1. A connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.
2. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.
3. A TCP reliability action in which unacknowledged or missing data is sent again.
4. A TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Correct Answer: D

 

Correct Answer

Answer D is correct because the choice accurately describes Window size: A TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Incorrect Answers

Answer A is incorrect because the “UDP” option describes a different concept: a connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

Answer B is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer C is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

 

Question 17

For Retransmission, which statement is accurate?

1. A TCP mechanism used by a receiver to confirm successful receipt of data.
2. A TCP reliability action in which unacknowledged or missing data is sent again.
3. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.
4. A connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

Correct Answer: B

 

Correct Answer

Answer B is correct because the selected answer describes a TCP reliability action in which unacknowledged or missing data is sent again.

Incorrect Answers

Answer A is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.

Answer C is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer D is incorrect because the “UDP” option describes a different concept: a connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

 

Question 18

For Transport checksum, which statement is accurate?

1. A field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.
2. A TCP field used to order data and detect missing segments.
3. A TCP reliability action in which unacknowledged or missing data is sent again.
4. A transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Correct Answer: A

 

Correct Answer

Answer A is correct because the selected answer describes a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Incorrect Answers

Answer B is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

Answer C is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

Answer D is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

 

Question 19

For Well-known port, which statement is accurate?

1. A TCP field used to order data and detect missing segments.
2. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.
3. A connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.
4. A transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Correct Answer: D

 

Correct Answer

Answer D is correct because it accurately defines Well-known port. The matching definition is: A transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Incorrect Answers

Answer A is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

Answer B is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer C is incorrect because the “TCP” option describes a different concept: a connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

 

Question 20

For Socket, which statement is accurate?

1. A TCP reliability action in which unacknowledged or missing data is sent again.
2. A communication endpoint commonly identified by an IP address, transport protocol, and port number.
3. A TCP field used to order data and detect missing segments.
4. A field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Correct Answer: B

 

Correct Answer

Answer B is correct because the choice accurately describes Socket: A communication endpoint commonly identified by an IP address, transport protocol, and port number.

Incorrect Answers

Answer A is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

Answer C is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

Answer D is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

 

Question 21

An application requires missing transport data to be retransmitted and received bytes to be delivered in order. Which transport protocol supplies both mechanisms?

1. Socket
2. Sequence number
3. TCP
4. Three-way handshake

Correct Answer: C

 

Correct Answer

Answer C is correct because TCP is the most precise fit for the stated requirement. A connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

Incorrect Answers

Answer A is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

Answer B is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

Answer D is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

 

Question 22

While working on a basic LAN troubleshooting session, an administrator encounters this requirement: A connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission. Which answer is the most precise match?

1. Retransmission
2. UDP
3. Acknowledgment
4. Socket

Correct Answer: B

 

Correct Answer

Answer B is correct because the scenario is describing the role of UDP. A connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

Incorrect Answers

Answer A is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

Answer C is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.

Answer D is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

 

Question 23

In a new branch deployment, the team must identify the technology that provides the following function: The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK. Which option should be selected?

1. Well-known port
2. Three-way handshake
3. Sequence number
4. TCP

Correct Answer: B

 

Correct Answer

Answer B is correct because Three-way handshake directly provides the function required by the scenario. The TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Incorrect Answers

Answer A is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Answer C is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

Answer D is incorrect because the “TCP” option describes a different concept: a connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

 

Question 24

A TCP sender needs confirmation that the receiving host has accepted data before advancing its send window. Which mechanism supplies that confirmation?

1. Acknowledgment
2. Transport checksum
3. Retransmission
4. Sequence number

Correct Answer: A

 

Correct Answer

Answer A is correct because the operational requirement in the stem maps to Acknowledgment: A TCP mechanism used by a receiver to confirm successful receipt of data.

Incorrect Answers

Answer B is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Answer C is incorrect because the “Retransmission” option describes a different concept: a TCP reliability action in which unacknowledged or missing data is sent again.

Answer D is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

 

Question 25

During a network fundamentals assessment, the design calls for the following capability: A TCP field used to order data and detect missing segments. Which option names that capability most accurately?

1. Sequence number
2. Well-known port
3. TCP
4. Socket

Correct Answer: A

 

Correct Answer

Answer A is correct because Sequence number is the most precise fit for the stated requirement. A TCP field used to order data and detect missing segments.

Incorrect Answers

Answer B is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Answer C is incorrect because the “TCP” option describes a different concept: a connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

Answer D is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

 

Question 26

A receiving host has limited buffer space and must restrict how much unacknowledged TCP data its peer sends. Which advertised value communicates this limit?

1. TCP
2. Sequence number
3. Transport checksum
4. Window size

Correct Answer: D

 

Correct Answer

Answer D is correct because the scenario is describing the role of Window size. A TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Incorrect Answers

Answer A is incorrect because the “TCP” option describes a different concept: a connection-oriented transport protocol that provides sequencing, acknowledgments, retransmission, and flow control.

Answer B is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

Answer C is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

 

Question 27

While working on a basic LAN troubleshooting session, an administrator encounters this requirement: A TCP reliability action in which unacknowledged or missing data is sent again. Which answer is the most precise match?

1. Three-way handshake
2. UDP
3. Retransmission
4. Sequence number

Correct Answer: C

 

Correct Answer

Answer C is correct because Retransmission directly provides the function required by the scenario. A TCP reliability action in which unacknowledged or missing data is sent again.

Incorrect Answers

Answer A is incorrect because the “Three-way handshake” option describes a different concept: the TCP connection-establishment exchange that uses SYN, SYN-ACK, and ACK.

Answer B is incorrect because the “UDP” option describes a different concept: a connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

Answer D is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

 

Question 28

In a new branch deployment, the team must identify the technology that provides the following function: A field used by TCP and UDP to detect corruption in the transport-layer segment or datagram. Which option should be selected?

1. Well-known port
2. Transport checksum
3. Acknowledgment
4. Socket

Correct Answer: B

 

Correct Answer

Answer B is correct because the operational requirement in the stem maps to Transport checksum: A field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Incorrect Answers

Answer A is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Answer C is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.

Answer D is incorrect because the “Socket” option describes a different concept: a communication endpoint commonly identified by an IP address, transport protocol, and port number.

 

Question 29

A service uses an assigned TCP port below 1024. Which port category contains this value?

1. Sequence number
2. Window size
3. Well-known port
4. UDP

Correct Answer: C

 

Correct Answer

Answer C is correct because Well-known port is the most precise fit for the stated requirement. A transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Incorrect Answers

Answer A is incorrect because the “Sequence number” option describes a different concept: a TCP field used to order data and detect missing segments.

Answer B is incorrect because the “Window size” option describes a different concept: a TCP flow-control value that indicates how much data may be sent before additional acknowledgment is required.

Answer D is incorrect because the “UDP” option describes a different concept: a connectionless transport protocol with low overhead that does not provide built-in delivery acknowledgment or retransmission.

 

Question 30

During a network fundamentals assessment, the design calls for the following capability: A communication endpoint commonly identified by an IP address, transport protocol, and port number. Which option names that capability most accurately?

1. Transport checksum
2. Well-known port
3. Socket
4. Acknowledgment

Correct Answer: C

 

Correct Answer

Answer C is correct because the scenario is describing the role of Socket. A communication endpoint commonly identified by an IP address, transport protocol, and port number.

Incorrect Answers

Answer A is incorrect because the “Transport checksum” option describes a different concept: a field used by TCP and UDP to detect corruption in the transport-layer segment or datagram.

Answer B is incorrect because the “Well-known port” option describes a different concept: a transport-layer port in the range 0 through 1023 commonly assigned to standard network services.

Answer D is incorrect because the “Acknowledgment” option describes a different concept: a TCP mechanism used by a receiver to confirm successful receipt of data.