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Question 210
A Cisco Catalyst trunk uses native VLAN 99. A frame from VLAN 20 is transmitted over this link; VLAN 20 is allowed and is not the native VLAN. How should this frame be represented on the trunk?
- Tag the frame with its non-native 802.1Q VLAN ID
- Transmit the VLAN 20 frame without an 802.1Q tag because 20 is a data VLAN
- Rewrite the VLAN identifier to native VLAN 99 and transmit without a tag
- Strip its VLAN information and use an IPv4 routing header instead
Explanation
Correct Answer
A:An allowed non-native VLAN is identified with an 802.1Q VLAN tag on the interswitch trunk; the native VLAN normally uses untagged transport.
Incorrect Answers
B:The exception for untagged native VLAN traffic does not apply to allowed non-native VLAN 20 frames.
C:That would change the frame’s VLAN association and violate the required isolation of VLAN 20 from VLAN 99.
D:802.1Q Layer 2 trunking does not replace Ethernet VLAN identification with a Layer 3 routing header.
Question 211
On a Catalyst switch, CDP is enabled and receiving advertisements from adjacent Cisco switches, while LLDP is disabled on the relevant links. The operator wants a compact list of neighboring device IDs and connected ports. Which IOS command uses the available discovery protocol?
- Run show cdp neighbors
- Run show lldp neighbors
- Run show lldp neighbors detail
- Run show ip route
Explanation
Correct Answer
A:CDP advertisements from adjacent Cisco devices populate the neighbor table displayed by show cdp neighbors, including local and remote port identifiers.
Incorrect Answers
B:LLDP is disabled on the stated links, so the LLDP neighbor display cannot provide this CDP-derived inventory.
C:The detailed LLDP view still depends on LLDP information, which the question explicitly excludes.
D:The IP route table lists network destinations and next hops, not the discovered local and remote Ethernet port IDs.
Question 212
An enterprise switch receives CDP advertisements from a directly connected Cisco router. LLDP is disabled on that link, and the network engineer needs the router platform, management IP address, and advertised software release. Which local IOS command should be used?
- show cdp neighbors detail
- show lldp neighbors detail
- show cdp neighbors
- show ip route
Explanation
Correct Answer
A:Detailed CDP neighbor output exposes the advertising router platform, entry IP address, and software version when these fields are advertised by the peer.
Incorrect Answers
B:LLDP has been disabled on this link, so it will not supply the discovered neighbor details despite supporting similar TLVs elsewhere.
C:The summary CDP neighbors output typically contains device and port data but omits the detailed management IP and IOS software version requested.
D:The IP routing table shows destination routes and next hops rather than a directly attached router’s CDP platform and software identity.
Question 213
A Cisco switch has LLDP globally enabled to discover standards-compliant third-party peers. Which show command lists LLDP-discovered neighboring devices and port identifiers?
- Run show lldp interface
- Run show lldp neighbors
- Run show cdp neighbors
- Run show lldp traffic
Explanation
Correct Answer
B:LLDP advertises local device identity and port information using an IEEE standard understood across vendors. The `show lldp neighbors` output therefore works for eligible multivendor links where LLDP is enabled.
Incorrect Answers
A:This displays LLDP configuration and interface transmit/receive status, not the required list of learned peer chassis and port identifiers.
C:CDP displays neighbors discovered by the Cisco-proprietary protocol, not the third-party LLDP neighbor table required here.
D:LLDP traffic counters indicate frames sent and received, not the identities of discovered neighbor ports.
Question 214
A directly connected third-party switch has LLDP enabled and advertises a management-address TLV plus system description. Cisco CDP is not exchanged with this neighbor. Which command lists those LLDP details beyond the abbreviated chassis/port summary?
- Run show cdp neighbors detail
- Run show lldp neighbors detail
- Run show lldp neighbors
- Run show ip interface brief
Explanation
Correct Answer
B:show lldp neighbors detail exposes available LLDP neighbor TLVs, including the advertised management address and system description.
Incorrect Answers
A:CDP is explicitly not exchanged by the third-party peer; CDP detail therefore cannot recover its LLDP management-address TLV.
C:The terse LLDP neighbor view focuses on device and port identifiers; the requested extra TLVs require the detail view.
D:The IPv4 interface summary reports local device interface addresses, not LLDP descriptors advertised by the remote switch.
Question 215
CDP is enabled globally but a physical port connects to an untrusted guest-owned switch. Which interface-level IOS setting suppresses CDP advertisements on only that untrusted port?
- Disable CDP globally with no cdp run
- Disable LLDP transmission with no lldp transmit
- Reduce the global CDP advertisement timer
- Apply no cdp enable to that interface
Explanation
Correct Answer
D:Per-interface CDP disablement prevents proprietary discovery advertisements on the exposed link.
Incorrect Answers
A:The global command suppresses discovery on every port, whereas the change must affect only the untrusted switch-facing interface.
B:This controls an LLDP interface advertisement direction, not Cisco CDP frames originating from the interface.
C:Changing a CDP interval does not prohibit advertisements on the guest-owned connected port.
Question 216
A network team wants to discover physically adjacent devices and advertised port IDs before inventorying a mixed Cisco/third-party campus, without using IP routing probes. Which discovery protocol family should be considered?
- Use CDP or LLDP neighbor discovery
- Rely only on Cisco-proprietary CDP, assuming every third-party device must implement it
- Use ARP to reveal each remote device chassis ID and the physical peer port name
- Use STP BPDU exchange as the primary complete multi-vendor neighbor inventory service
Explanation
Correct Answer
A:Cisco CDP or IEEE LLDP can advertise immediate Layer 2 neighbor identity and local/remote port information. For third-party peers, LLDP provides the standards-based discovery method without requiring CDP support.
Incorrect Answers
B:CDP is Cisco-proprietary and cannot be assumed available on every third-party device in the mixed-vendor campus.
C:ARP resolves on-link IPv4 addresses to MAC addresses; it does not advertise chassis identity and remote port identifiers like LLDP/CDP.
D:STP BPDUs establish loop-prevention topology information; they are not a general-purpose substitute for the CDP/LLDP neighbor and port inventory.
Question 217
`show cdp neighbors` lists a device ID, a local interface and a remote port ID. An operator must identify the **local** switch interface carrying that neighbor. Which displayed field provides it?
- Read the Port ID field
- Read the local interface field in show cdp neighbors
- Read the Device ID field
- Read the Platform field
Explanation
Correct Answer
B:CDP neighbor listings map each peer to the local receiving interface.
Incorrect Answers
A:The neighbor Port ID identifies the interface on the remote device, not the port on this local switch.
C:The Device ID is the adjacent switch or router identity; it does not name the local physical port.
D:Platform identifies the peer device family rather than the local interface carrying the CDP packets.
Question 218
LLDP commands report no peers and `show lldp` indicates the feature is globally disabled on a Catalyst switch. Which global command starts LLDP processing before individual interface settings are considered?
- Enable lldp run
- Enable lldp transmit only under one interface
- Enable cdp run globally
- Run show lldp neighbors detail
Explanation
Correct Answer
A:The global LLDP command permits standards-based advertisements and reception subject to interface settings.
Incorrect Answers
B:An interface-level transmit setting does not enable LLDP globally when the system-wide LLDP process is disabled.
C:CDP is Cisco proprietary neighbor discovery and will not start the separate LLDP process.
D:A display command reads neighbor state; it cannot enable the globally disabled LLDP process.
Question 219
A Catalyst switch reports no CDP advertisements, and the technician wants to know if CDP is globally enabled plus its timer/holdtime. Which general CDP operational command checks that status?
- Run show cdp neighbors
- Run show cdp traffic
- Inspect show cdp
- Run show lldp
Explanation
Correct Answer
C:CDP status and advertisement parameters are visible in its global show output.
Incorrect Answers
A:This enumerates discovered Cisco neighbors, but the requirement is the local global CDP enablement, timer and holdtime information.
B:Traffic statistics help count CDP packets; they do not directly report the global timer and holdtime configuration requested.
D:LLDP is an independent IEEE discovery service; its status is not the global Cisco CDP configuration.
Question 220
A third-party router does not speak Cisco proprietary CDP but supports IEEE 802.1AB. Which discovery protocol can reveal its chassis and port on a Catalyst link?
- Use LLDP rather than requiring CDP
- Use CDP and assume all IEEE peers implement it
- Use ARP entries as physical neighbor identifiers
- Use STP bridge information as LLDP replacements
Explanation
Correct Answer
A:LLDP is a vendor-neutral protocol and does not depend on Cisco proprietary CDP.
Incorrect Answers
B:CDP is Cisco proprietary and is not required on a standards-only third-party router.
C:ARP resolves on-link IP addresses to MAC addresses; it does not provide the discovery chassis/port metadata identified in the question.
D:STP selects loop-free forwarding roles, not the general inventory of peer chassis and advertised physical port IDs.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests