hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip bgp neighbors 10.1.12.2
BGP neighbor is 10.1.12.2, remote AS 65002, external link BGP version 4, remote router ID 10.2.2.2 BGP state = Idle Last read 00:00:00, last write 00:00:00, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new) Four-octets ASN Capability: advertised and received Address family IPv4 Unicast: advertised and received Enhanced Refresh Capability: advertised Multisession Capability: State is never active Message statistics: InQ depth is 0 OutQ depth is 0
Based on this output, what is the most likely cause of the BGP session being in Idle state?
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 BGP neighbor is administratively shut down (neighbor shutdown).
Idle state typically indicates that BGP is not attempting to connect, often due to a configuration issue such as a missing neighbor statement, incorrect AS number, or a shutdown. The 'State is never active' suggests the session has never transitioned to Active, pointing to a configuration problem.
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 neighbor 10.1.12.2 is not reachable via IP routing.
Why it's wrong here
Unreachability would cause Active state, not Idle.
- ✓
The BGP neighbor is administratively shut down (neighbor shutdown).
Why this is correct
Idle state with 'never active' often indicates the neighbor is shut down or the BGP process is not configured correctly. A shutdown command would keep the session in Idle.
- ✗
The remote AS number is misconfigured.
Why it's wrong here
A misconfigured AS would typically cause Active state as the router tries to connect but receives a wrong AS notification.
- ✗
The BGP update timer is too long.
Why it's wrong here
There is no BGP update timer; the issue is with session establishment.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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