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352-001 · Question #525
352-001 Question #525: Real Exam Question with Answer & Explanation
The correct answer is D: BGP. BGP is the appropriate protocol to interconnect environments that must communicate but remain as separate failure domains, since it operates between distinct autonomous systems.
Question
You are presented with requirements to design a development, testing and production environments. These environment should communicate with each other, yet they should be kept as separate failure domains. Which routing protocol should be configured on the links between the networks to support the design requirements?
Options
- AOSPF
- BEIGRP
- CIS-IS
- DBGP
Explanation
BGP is the appropriate protocol to interconnect environments that must communicate but remain as separate failure domains, since it operates between distinct autonomous systems.
Common mistakes.
- A. OSPF is an IGP that operates within a single routing domain - all routers share the same LSDB, meaning a topology failure propagates to all routers rather than being contained to a separate domain.
- B. EIGRP, while using AS numbers, is still an IGP designed for intra-domain routing and does not provide the policy controls or domain isolation that BGP offers between separate administrative boundaries.
- C. IS-IS is a link-state IGP similar to OSPF and operates within a single IS-IS domain, providing no mechanism to isolate failure domains between separate network environments.
Concept tested. BGP for inter-domain routing and failure domain isolation
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