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300-410 Practice Question: Examine this BGP configuration on router R3:…

Examine this BGP configuration on router R3:

router bgp 65003

bgp router-id 3.3.3.3

neighbor 10.3.3.2 remote-as 65002
 neighbor 10.3.3.2 ebgp-multihop 2
 neighbor 10.3.3.2 update-source Loopback0

!

interface Loopback0
 ip address 3.3.3.3 255.255.255.255

What is the likely issue with this configuration?

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 neighbor 10.3.3.2 must be reachable via the loopback address 3.3.3.3; otherwise, the session will not come up.

The ebgp-multihop 2 allows the neighbor to be two hops away, but the update-source is set to Loopback0 (3.3.3.3). The neighbor 10.3.3.2 must be reachable via the loopback. If 10.3.3.2 is not reachable from 3.3.3.3, the session will not establish.

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 ebgp-multihop value should be 1 for directly connected neighbors.

    Why it's wrong here

    Multihop is needed if using loopback as update source, even if directly connected.

  • ✓

    The neighbor 10.3.3.2 must be reachable via the loopback address 3.3.3.3; otherwise, the session will not come up.

    Why this is correct

    BGP uses the update-source address as the source IP; the neighbor must be able to reach that IP.

  • ✗

    The remote-as 65002 should be the same as the local AS for eBGP.

    Why it's wrong here

    eBGP requires different AS numbers.

  • ✗

    The update-source command is not needed when using ebgp-multihop.

    Why it's wrong here

    Update-source is required to specify the source interface for the session.

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Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

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