Practise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command.
Start Scenario PracticeAn engineer is troubleshooting an MPLS network where some routers are not exchanging labels via LDP. Which two steps are most appropriate for diagnosing the issue? (Choose two.)
Explanation: Option A is correct because 'show mpls ldp neighbor' displays the state of LDP sessions (Operational, Non-existent, etc.) and the TCP connection status to each peer, which directly reveals whether label distribution adjacencies are forming. Option E is correct because LDP only runs on interfaces where 'mpls ip' (or 'mpls ldp' on some platforms) is enabled, and 'show mpls ldp interface' confirms which interfaces are actively participating in LDP label exchange. Option B is not appropriate because MTU mismatches typically affect data forwarding or IGP adjacency formation, not the LDP session establishment itself. Option C is not appropriate because rebooting routers is a disruptive action that does not diagnose the root cause of failed LDP sessions. Option D is not appropriate because while LDP relies on underlying IP reachability (often provided by OSPF), verifying OSPF adjacencies alone does not confirm LDP-specific configuration or session state.
An MPLS core network uses LDP to distribute labels. An engineer wants to verify that the LDP session between two routers is up and exchanging labels. Which command should be used?
Explanation: The command 'show mpls ldp neighbor' displays the status of LDP sessions, including the neighbor's IP address, session state (e.g., Operational), and label exchange activity. Since LDP is the protocol used to distribute labels in this MPLS core network, this command directly verifies that the session is up and exchanging labels between the two routers.
Drag and drop the steps to configure a static route on a Cisco IOS router into the correct order.
Explanation: Static routes require global config mode and must specify the destination network, subnet mask, and next-hop address or exit interface.
A service provider is implementing EVPN for its VPLS replacement. They have configured BGP EVPN on all PEs and have set up an EVPN instance for a customer requiring broadcast, unknown unicast, and multicast (BUM) traffic. The customer reports that broadcast traffic from one site is not being received at another site. The engineer checks the EVPN configuration and finds that the EVI is configured correctly, the route-target matches, and the BGP sessions are established. The engineer also checks the MAC address table on the receiving PE and sees that the source MAC of the broadcast frame is learned on the local interface, but not from the remote VTEP. The engineer suspects an issue with the IMET (Inclusive Multicast Ethernet Tag) route. Which action should the engineer take to verify the IMET route?
Explanation: In BGP EVPN, the IMET (Inclusive Multicast Ethernet Tag) route is a Type-3 route used to build the multicast tunnel for BUM (broadcast, unknown unicast, multicast) traffic. If BUM traffic from one site is not reaching another, and the MAC table shows the source MAC learned locally but not from the remote VTEP, the IMET route is likely missing or not being advertised/received. The correct verification is to inspect the BGP EVPN route table specifically for Type-3 routes using 'show bgp l2vpn evpn route-type 3'.
An automation engineer uses RESTCONF to configure a Cisco ASR 9000 router. When sending a PATCH request to update an interface description, the API returns 404 Not Found. What is the most probable issue?
Explanation: A 404 Not Found response to a RESTCONF PATCH request targeting a specific interface indicates that the resource (the interface) does not exist at the given URI. RESTCONF uses the URI path to identify the exact YANG data node; if the interface name in the URI does not match any configured interface on the Cisco ASR 9000, the server returns 404. This is consistent with RFC 8040, where 404 is used when the target resource cannot be found.
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Practice all Which Command Should the Administrator Use Practice QuestionsPractise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command. These appear throughout the 350-501 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 350-501. Practicing each scenario type ensures you're ready for any format.
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