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Match each troubleshooting command focus to what it most directly helps verify.

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Match each troubleshooting command focus to what it most directly helps verify.

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Common exam trap

Common exam trap: answer the scenario, not the keyword

A common exam trap is confusing which show command verifies which operational aspect of a Cisco router or switch. For example, candidates often mistake 'show ip ospf neighbor' as verifying routing table contents rather than OSPF adjacency. Similarly, 'show interfaces trunk' might be incorrectly linked to VLAN membership instead of trunk status. This confusion arises because multiple commands relate to VLANs or routing but serve distinct verification purposes. Misidentifying these commands leads to incorrect troubleshooting steps and exam answers, especially under time pressure where quick recall is essential.

Technical deep dive

How to think about this question

Troubleshooting Cisco networks efficiently requires understanding the specific verification purpose of each show command. The 'show ip route' command displays the routing table, revealing how the router forwards packets based on learned routes from static configurations or dynamic routing protocols like OSPF or EIGRP. This command is fundamental for verifying that routing decisions align with network design and that routes are correctly installed and preferred according to administrative distance and metrics. The 'show ip ospf neighbor' command focuses on OSPF protocol operation by listing OSPF neighbors and their states. OSPF adjacency formation is critical for route exchange and network stability. This command helps verify that OSPF routers have established proper neighbor relationships, which is a prerequisite for route synchronization. Without adjacency, OSPF routes will not propagate, causing connectivity issues. For VLAN and link aggregation troubleshooting, 'show interfaces trunk' confirms whether a switch port is correctly configured as a trunk and which VLANs are allowed across it. This ensures VLAN traffic segmentation and inter-switch communication. Meanwhile, 'show etherchannel summary' provides a concise status of EtherChannel bundles, showing if member interfaces are bundled correctly and the protocol used (PAgP or LACP). Proper EtherChannel formation improves bandwidth and redundancy, so verifying it prevents link failures and misconfigurations.

KKey Concepts to Remember

  • The 'show ip route' command displays the router's routing table, allowing verification of learned routes and their administrative distances.
  • The 'show ip ospf neighbor' command lists OSPF neighbors and their states, verifying OSPF adjacency formation essential for route exchange.
  • The 'show interfaces trunk' command confirms trunk port status and allowed VLANs, ensuring proper VLAN traffic segmentation across switches.
  • The 'show etherchannel summary' command verifies EtherChannel bundle formation and member interface status, confirming link aggregation.
  • Routing table verification helps identify whether routing protocols or static routes are correctly installed and preferred for packet forwarding.
  • OSPF adjacency verification ensures that routers have established neighbor relationships necessary for exchanging routing information.
  • VLAN trunk verification prevents VLAN traffic isolation issues by confirming trunk configuration and VLAN membership.
  • EtherChannel verification prevents bandwidth and redundancy problems by ensuring correct link bundling and protocol operation.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Related practice questions

Related 200-301 practice-question pages

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?

Question 2

A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?

Question 3

What is the OSPF metric called?

Question 4

A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?

Question 5

A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?

Question 6

A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?

FAQ

Questions learners often ask

What does this 200-301 question test?

The 'show ip route' command displays the router's routing table, allowing verification of learned routes and their administrative distances.

What exam trap should I watch out for?

Common exam trap: answer the scenario, not the keyword: A common exam trap is confusing which show command verifies which operational aspect of a Cisco router or switch. For example, candidates often mistake 'show ip ospf neighbor' as verifying routing table contents rather than OSPF adjacency. Similarly, 'show interfaces trunk' might be incorrectly linked to VLAN membership instead of trunk status. This confusion arises because multiple commands relate to VLANs or routing but serve distinct verification purposes. Misidentifying these commands leads to incorrect troubleshooting steps and exam answers, especially under time pressure where quick recall is essential.

What should I do if I get this 200-301 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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