Which routers in AS100, depicted above, must run EBGP?
Understand the Problem
The question is asking which routers in Autonomous System (AS) 100 need to run External Border Gateway Protocol (EBGP) based on the provided network diagram. It requires an understanding of networking concepts and the role of routers in different autonomous systems.
Answer
Routers A, C, and D.
The final answer is Routers A, C, and D must run EBGP in AS100.
Answer for screen readers
The final answer is Routers A, C, and D must run EBGP in AS100.
More Information
Routers that participate in eBGP sessions will communicate with routers in other autonomous systems. According to BGP principles, if routers connect to networks outside their own AS, they must use eBGP.
Tips
A common mistake is to assume iBGP requirements are similar to eBGP. Make sure to understand the difference between intra-domain and inter-domain configurations.
Sources
- Demystifying BGP Session Establishments - Packet Pushers - packetpushers.net
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