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300-320 · Question #5
300-320 Question #5: Real Exam Question with Answer & Explanation
The correct answer is D: EIGRP. EIGRP provides the fastest convergence in campus environments due to its DUAL algorithm, which pre-computes loop-free backup paths and enables near-instantaneous failover.
Question
Which routing protocol provides the fastest convergence and greatest flexibility within a campus environment?
Options
- AOSPF
- BIS-IS
- CBGP
- DEIGRP
Explanation
EIGRP provides the fastest convergence in campus environments due to its DUAL algorithm, which pre-computes loop-free backup paths and enables near-instantaneous failover.
Common mistakes.
- A. OSPF requires an SPF calculation after topology changes and, while fast, generally converges more slowly than EIGRP in a campus environment due to its link-state flooding mechanism.
- B. IS-IS is a link-state protocol primarily used in service provider cores; it offers good scalability but is not optimized for campus environments and is less commonly deployed there.
- C. BGP is a path-vector protocol designed for inter-domain routing with slow convergence characteristics - it is not appropriate for campus network routing due to its high overhead and slow failover.
Concept tested. EIGRP campus convergence DUAL algorithm
Reference. https://www.cisco.com/c/en/us/tech/ip/enhanced-interior-gateway-routing-protocol-eigrp/index.html
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