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350-401 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show bgp ipv4 unicast 10.10.10.0
BGP routing table entry for 10.10.10.0/24, version 20 Paths: (2 available, best #1, table default) Advertised to update-groups: 1 Refresh Epoch 1 65050 65100
10.0.1.2 from 10.0.1.2 (10.0.0.2)
Origin IGP, metric 0, localpref 100, weight 0, valid, external, best rx pathid: 0, tx pathid: 0x0 65050 65100 65200
10.0.1.3 from 10.0.1.3 (10.0.0.3)
Origin IGP, metric 0, localpref 100, weight 0, valid, external rx pathid: 0, tx pathid: 0x0
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the AS_PATH length comparison by presenting two paths with different AS_PATH lengths but identical other attributes, expecting candidates to know that shorter AS_PATH is preferred, not longer.
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
✓
Path #1 is the best path because it has a shorter AS_PATH length.
B is correct because BGP selects the best path based on the shortest AS_PATH length when all other attributes (weight, local preference, origin) are equal. In the output, Path #1 has an AS_PATH of '65050 65100' (2 AS numbers) while Path #2 has '65050 65100 65200' (3 AS numbers), making Path #1 the best path. The 'best #1' annotation confirms this selection.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Path #2 is the best path because it has a longer AS_PATH, indicating more specific routing.
Why it's wrong here
BGP prefers shorter AS_PATH, not longer. Longer AS_PATH is less preferred.
- ✓
Path #1 is the best path because it has a shorter AS_PATH length.
Why this is correct
Path #1 has AS_PATH length 2 (65050 65100) while path #2 has length 3 (65050 65100 65200). Shorter AS_PATH is preferred.
- ✗
Both paths are equally preferred, and BGP uses tie-breaking rules like router ID.
Why it's wrong here
The paths are not equal because AS_PATH lengths differ. BGP does not proceed to tie-breaking when AS_PATH is different.
- ✗
Path #1 is the best path because it is received from a higher IP address.
Why it's wrong here
The best path selection is based on AS_PATH length, not neighbor IP address.
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Last reviewed: Jun 24, 2026
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