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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 10.0.0.0/8
BGP routing table entry for 10.0.0.0/8, version 25 Paths: (2 available, best #2, 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 rx pathid: 0, tx pathid: 0x0 65050
10.0.1.3 from 10.0.1.3 (10.0.0.3)
Origin IGP, metric 0, localpref 100, weight 0, valid, external, best rx pathid: 0, tx pathid: 0x0
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the BGP best-path selection order, and the trap here is that candidates may assume that a longer AS_PATH indicates a more specific or preferred route, or that the path with the higher neighbor IP address is chosen, when in fact BGP strictly prefers the shortest AS_PATH at this stage of the decision process.
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 #2 is the best path because it has a shorter AS_PATH.
BGP selects the best path based on a set of well-defined tie-breaking rules. After comparing weight, local preference, and origin, the next step is AS_PATH length. Path #2 has an AS_PATH of '65050' (one AS), while Path #1 has '65050 65100' (two ASes). Since a shorter AS_PATH is preferred, Path #2 is chosen as the best path, making option B 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.
- ✗
Path #1 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.
- ✓
Path #2 is the best path because it has a shorter AS_PATH.
Why this is correct
Path #2 has AS_PATH length 1 (65050) while path #1 has length 2 (65050 65100). 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.
- ✗
Path #2 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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