Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Exhibit
R1# ping 10.1.23.2 !!!!! R1# show ip route 192.168.3.0 % Network not in table
Exhibit: R1 can ping 10.1.23.2 but cannot ping 192.168.3.10 behind R3. The routing table on R1 lacks 192.168.3.0/24. What is the best next check?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Verify whether the remote LAN is being advertised into the routing process
That is the most direct next troubleshooting step.
B
Distractor review
Replace the Ethernet cable between R1 and R2
The next-hop router is already reachable.
C
Distractor review
Change the OSPF router ID on R1 immediately
Nothing here points specifically to router ID.
D
Distractor review
Disable CEF so the route can be learned
CEF does not stop the route from being learned.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is to confuse physical connectivity with routing issues. Because R1 can ping 10.1.23.2 (likely the next-hop router), candidates might mistakenly try to fix cables or interfaces instead of checking routing advertisements. Another trap is to focus on router ID changes or disabling features like CEF, which do not affect route learning. The key mistake is ignoring the routing table contents and assuming that reachability to the next-hop router guarantees full path reachability. This leads to wasted time and incorrect troubleshooting steps.
Technical deep dive
How to think about this question
Routing protocols like OSPF, EIGRP, and RIP enable routers to share information about connected networks. Each router advertises its directly connected LANs so that other routers can learn routes to those networks and populate their routing tables accordingly. This process ensures end-to-end connectivity across multiple routers in an internetwork. When a router cannot ping a remote IP address, the first step is to check its routing table. If the remote network is missing, it means the router has not learned about that network. This usually happens because the remote router is not advertising the network into the routing protocol or there is a filtering mechanism blocking the advertisement. Since R1 can ping the next-hop router (R2), the issue is not physical connectivity but missing routing information for the remote LAN behind R3. A common exam trap is to focus on physical layer issues or router IDs when the problem is clearly routing-related. For example, replacing cables or changing router IDs will not fix missing route advertisements. In practice, verifying that the remote LAN is advertised into the routing process on R3 ensures that R1 can learn the route and forward traffic correctly. This step aligns with Cisco best practices for troubleshooting routing connectivity problems.
KKey Concepts to Remember
- A router learns remote networks through routing protocols that advertise connected LANs into the routing domain.
- Routing tables on Cisco routers only include networks that are directly connected or learned via routing protocol advertisements.
- If a router cannot ping a remote IP, the absence of that network in the routing table indicates missing or incomplete route advertisement.
- OSPF and other routing protocols require all routers to advertise their connected LANs to maintain full network reachability.
- A reachable next-hop router does not guarantee reachability to all networks behind it without proper route advertisement.
- Cisco routers use routing protocols to dynamically learn routes, and missing advertisements cause routing table gaps.
- Troubleshooting connectivity issues involves verifying that all remote LANs are properly advertised and present in routing tables.
- Route advertisement issues are a common cause of partial connectivity in multi-router environments using dynamic routing.
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.
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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?
A router learns remote networks through routing protocols that advertise connected LANs into the routing domain.
What is the correct answer to this question?
The correct answer is: Verify whether the remote LAN is being advertised into the routing process — Because the directly connected next router is reachable, the problem is likely missing routing information for the remote LAN. The best next check is whether R3 is advertising 192.168.3.0/24 or whether that network is present in the routing domain at all.
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.
Discussion
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