Troubleshoot BGP (Internal and External, unicast, and VRF-Lite)
7 practice questions under this official exam objective (300-410) — each with the community-verified answer, a full option-by-option explanation and instant feedback.
Which BGP AS path access list permits only routes originated in AS 100?
This question tests BGP AS path access lists for filtering routes originated outside AS 100. The page explains why the correct filter is ^100$, permit
Which BGP Dampening Config Fixes Routes Withdrawn From Peers?
This 300-410 exhibit question asks which configuration stops BGP-learned networks from being repeatedly withdrawn from peers, and the correct answer i
Troubleshooting BGP TCP MD5 Authentication Errors
This question addresses the %TCP-6-BADAUTH error indicating missing BGP MD5 authentication on a neighbor, establishing that both peers must have match
Why Is an iBGP Route Not Advertised to eBGP Peer R3?
When 130.130.130.0/24 sits in R2's table but never reaches R3, the culprit is BGP synchronization withholding an iBGP-learned prefix from an eBGP peer
Which Protocol Advertises PE Routes to a CE Router in MPLS L3VPN?
In an MPLS Layer 3 VPN, VPNv4 prefixes carried by MP-BGP between PE routers are stripped of their RD before being handed to a VRF-unaware CE, and that
MP-BGP IPv6 Route Exchange Troubleshooting
This question examines MP-BGP configuration requirements for exchanging IPv6 routes, specifically identifying the necessary address-family and network
Why Is the eBGP Neighbor Not Coming Up?
When an eBGP peer's address is not on a directly connected subnet, the session never forms because eBGP sends its TCP packets with a TTL of 1. Raising