easyMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a BGP…
A network engineer runs the following command to troubleshoot a BGP prefix issue:
R1# show bgp ipv4 unicast 192.168.10.0/24
BGP routing table entry for 192.168.10.0/24, version 5 Paths: (1 available, best #1, table default) Advertised to update-groups: 1 Refresh Epoch 1 Local
10.1.1.2 from 10.1.1.2 (2.2.2.2)
Origin IGP, metric 0, localpref 100, valid, external, best rx pathid: 0, tx pathid: 0x0
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between eBGP and iBGP by using the 'external' or 'internal' keyword in the show output, and the trap here is that candidates may misread 'external' as 'iBGP' or overlook the 'best' flag, assuming the prefix is not the best path.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The prefix is learned via eBGP and is the best path.
The output shows the prefix 192.168.10.0/24 is learned from neighbor 10.1.1.2 with the path type 'external', indicating eBGP. The line 'valid, external, best' confirms it is the best path, making option A correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The prefix is learned via eBGP and is the best path.
Why this is correct
The output shows 'valid, external, best', confirming it is the best eBGP route.
- ✗
The prefix is learned via iBGP and is not the best path.
Why it's wrong here
It is marked as external, not internal.
- ✗
The prefix is suppressed and not advertised to peers.
Why it's wrong here
It is advertised to update-group 1.
- ✗
The prefix is invalid due to missing next-hop reachability.
Why it's wrong here
The prefix is marked as valid.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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