Practise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command.
Start Scenario PracticeDrag and drop the steps to troubleshoot OSPF DR/BDR election on a multi-access segment into the correct order, from first to last.
Explanation: The correct order ensures that the OSPF DR/BDR election is properly influenced. First, verify the current DR/BDR roles using show ip ospf interface. Next, set the OSPF priority on the desired router to a higher value than the current DR. Then, clear the OSPF process on all routers to force a new election. After that, verify the new DR/BDR roles have been elected as expected. Finally, confirm that adjacencies are formed with the new DR/BDR.
Drag and drop the steps to verify and validate IPv6 traffic filtering and uRPF operational state into the correct order, from first to last.
Explanation: Validation begins with checking the uRPF configuration on the interface, then verifying the interface status, inspecting uRPF statistics, testing connectivity with ping, and finally confirming the routing table for expected routes.
Drag and drop the steps to verify and validate the operational state of IPv4 ACLs into the correct order, from first to last.
Explanation: First, display all ACLs with show access-list; second, check interface bindings with show ip interface; third, verify hits on each entry; fourth, confirm the ACL is active using show running-config; fifth, test traffic with extended ping or traffic generator.
A 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.
An engineer configures an IPsec VPN between two routers using a transform-set with ESP encryption (AES 256) and ESP authentication (SHA-256). The engineer also applies an IPv4 ACL to define interesting traffic that matches all IP traffic. After configuration, the VPN tunnel comes up, but only ICMP traffic is encrypted; other traffic like HTTP is sent in clear text. What is the most likely explanation?
Explanation: The most likely explanation is that the ACL for interesting traffic only permits ICMP, so only ICMP is encrypted. In Cisco IOS, the crypto map uses the ACL to identify which traffic should be protected by IPsec. If the ACL only matches ICMP (e.g., 'permit icmp any any'), then only ICMP packets trigger IPsec encryption; all other traffic, such as HTTP, is forwarded in clear text because it does not match the ACL and is therefore not subject to IPsec processing.
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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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