Practise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command.
Start Scenario PracticeA network engineer runs the following command to troubleshoot a Control Plane Policing (CoPP) issue: R1# show bgp neighbors 10.1.1.2 received-routes BGP table version is 10, local router ID is 10.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 10.3.3.0/24 10.1.1.2 0 100 0 i Total number of prefixes 1 What does this output indicate?
Explanation: The output shows a single BGP prefix (10.3.3.0/24) received from neighbor 10.1.1.2, with the route marked as valid (*) and best (>). This confirms that BGP is successfully receiving and processing the update, and the route is eligible for installation in the routing table. Since the route appears in the received-routes output, CoPP is not dropping the inbound BGP update packets, as CoPP would prevent the packets from reaching the BGP process entirely.
A switch is configured with RSPAN to monitor traffic from VLAN 50 to a remote switch via VLAN 200. The source switch has: monitor session 1 source vlan 50 rx monitor session 1 destination remote vlan 200. The remote switch has: monitor session 2 source remote vlan 200 monitor session 2 destination interface Gi0/2. The intermediate switches have VLAN 200 configured with 'remote-span'. The network uses VTP transparent mode. The analyzer connected to Gi0/2 sees intermittent traffic. The RSPAN VLAN 200 is also used as a native VLAN on some trunk ports. What is the likely cause of intermittent traffic?
Explanation: When the RSPAN VLAN is also configured as the native VLAN on a trunk, mirrored frames are sent untagged on that trunk. Intermediate switches may treat untagged frames as belonging to the native VLAN rather than the RSPAN VLAN, causing them to be forwarded incorrectly or dropped, resulting in intermittent traffic at the destination.
Drag and drop the steps to troubleshoot Policy-Based Routing (PBR) adjacency or connectivity failures into the correct order, from first to last.
Explanation: Start by checking if PBR is applied on the correct interface. Then verify the route map sequence and match statements. Check the set next-hop reachability via routing table. Use 'debug ip policy' to see packet matches. Finally, test with extended ping or traceroute to confirm path.
A network engineer runs the following command to verify BFD with MPLS LDP: R1# show mpls ldp neighbor 10.6.6.2 detail Peer LDP Ident: 10.6.6.2:0, Local LDP Ident: 10.6.6.1:0 TCP connection: 10.6.6.2.646 - 10.6.6.1.53456 State: Oper; Msgs sent/rcvd: 100/100; Downstream Up time: 00:10:00 LDP discovery sources: GigabitEthernet0/2, hello interval: 5 s, hello hold: 15 s Addresses bound to peer LDP ident: 10.6.6.2 10.7.7.2 BFD enabled, BFD state: UP What does this output indicate?
Explanation: The output shows 'BFD enabled, BFD state: UP', indicating that BFD is operational for this LDP session, which allows faster failure detection than LDP hello timers alone.
A network engineer runs the following command to verify IPv6 traffic filtering with logging: R1# show logging | include FILTER *Mar 1 00:04:56.789: %IPV6_ACL-6-ACCESSLOGDP: list FILTER denied tcp 2001:DB8:2::1(12345) -> 2001:DB8:3::1(80), 1 packet What does this output indicate?
Explanation: The log message shows an IPv6 ACL (named FILTER) logging a denied TCP packet from source 2001:DB8:2::1 port 12345 to destination 2001:DB8:3::1 port 80. The keyword 'denied' in the log entry confirms the packet was blocked by the access list, making option A correct.
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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 300-410 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 300-410. Practicing each scenario type ensures you're ready for any format.
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