Practise routing and connectivity troubleshooting scenarios involving R1, R2, R3, static routes, OSPF, next hops and routing tables.
Start Scenario PracticeDrag and drop the steps of OSPF summarization at ABR configuration steps into the correct order, from first to last.
Explanation: First, identify the subnets to summarize into a single prefix. Then, configure the area range command on the ABR under the OSPF process, specifying the area and the summary prefix. Optionally, set the 'not-advertise' keyword to suppress the summary. Verify the summary route in the OSPF database using 'show ip ospf summary-address'. Finally, check that the summary route appears in the routing table of other routers.
Drag and drop the steps of DHCP snooping operation on a Cisco switch into the correct order, from first to last.
Explanation: DHCP snooping begins by enabling the feature globally with 'ip dhcp snooping'. Then, the feature is enabled on specific VLANs. Trusted interfaces (typically uplinks to DHCP servers) are configured with 'ip dhcp snooping trust'. The switch then intercepts DHCP messages, building the DHCP snooping binding database from valid server responses. Finally, any DHCP server messages received on untrusted interfaces are dropped to prevent rogue server attacks.
What is the default OSPF hello interval on an Ethernet link in a Cisco router?
Explanation: The default OSPF hello interval on an Ethernet link (which is a broadcast multi-access network type) is 10 seconds. This is defined in RFC 2328 and is the default on Cisco routers for broadcast and point-to-point network types. The hello interval determines how often a router sends hello packets to discover and maintain neighbor relationships.
A network engineer runs the following command on Switch SW1: SW1# show etherchannel summary Flags: D - down P - bundled in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use N - not in use, no aggregation f - failed to allocate aggregator M - not in use, minimum links not met u - unsuitable for bundling w - waiting to be aggregated d - default port Number of channel-groups in use: 1 Number of aggregators: 1 Group Port-channel Protocol Ports ------+-------------+-----------+-------------------------------------------- 1 Po1(SU) LACP Gi0/1(P) Gi0/2(P) Gi0/3(D) Based on this output, what can be concluded?
Explanation: The output shows that Gi0/1 and Gi0/2 have a flag of 'P' (bundled in port-channel), while Gi0/3 has a flag of 'D' (down). Therefore, only two ports are actively bundled, making option D correct. The 'SU' flags on Po1 indicate the port-channel is Layer 2 (S) and in use (U), not Layer 3.
Drag and drop the steps of DHCP snooping and dynamic ARP inspection flow into the correct order, from first to last.
Explanation: DHCP snooping builds a binding table used by DAI. The switch validates DHCP messages, creates bindings, then intercepts ARP packets and compares them against the binding table to prevent spoofing.
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Practice all Router R1 Cannot Reach R3 Practice QuestionsPractise routing and connectivity troubleshooting scenarios involving R1, R2, R3, static routes, OSPF, next hops and routing tables. These appear throughout the 350-401 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 350-401. Practicing each scenario type ensures you're ready for any format.
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