mediumMultiple 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 192.168.1.2
BGP neighbor is 192.168.1.2, remote AS 65001, external link BGP version 4, remote router ID 10.2.2.2 BGP state = Established, up for 00:15:00 Last read 00:00:05, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is multisession capable
Neighbor capabilities:
Route refresh: advertised and received(new) Four-octets ASN: advertised and received Address family IPv4 Unicast: advertised and received Enhanced Refresh: advertised Message statistics: InQ depth is 0 OutQ depth is 0 Sent Rcvd Opens: 1 1 Notifications: 0 0 Updates: 10 5 Keepalives: 15 15 Route Refresh: 0 0 Total: 26 21 Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast Session: 192.168.1.2 BGP table version 14, neighbor version 14/0 Output queue size : 0 Index 1, Advertise bit 0 1 update-group member Incoming update prefix filter list: FILTER_IN Outgoing update prefix filter list: FILTER_OUT Sent Rcvd Prefixes: 2 2 Updates: 10 5
Based on this output, what is the effect of the prefix lists?
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 lists FILTER_IN and FILTER_OUT are allowing only 2 prefixes in each direction.
The output shows that incoming and outgoing prefix filters (FILTER_IN and FILTER_OUT) are applied. The prefixes sent and received are both 2, indicating that the filters are allowing exactly 2 prefixes in each direction. The correct answer is that the prefix lists are filtering routes to only 2 prefixes.
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 lists FILTER_IN and FILTER_OUT are allowing only 2 prefixes in each direction.
Why this is correct
The counters show 2 prefixes sent and received, matching the filter lists.
- ✗
The prefix lists are blocking all prefixes.
Why it's wrong here
2 prefixes are being exchanged.
- ✗
The prefix lists are not applied because the session is established.
Why it's wrong here
The output shows they are applied.
- ✗
The prefix lists are misconfigured and causing route flapping.
Why it's wrong here
No evidence of flapping; session is stable.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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