Cisco Certified Support Technician (CCST) NetworkingIP ConnectivityEasy
A network administrator is configuring a router to participate in a routing protocol that uses a metric based on bandwidth and delay. Which routing protocol is being configured?
- ABGP (Border Gateway Protocol)
- BRIP (Routing Information Protocol)
- CEIGRP (Enhanced Interior Gateway Routing Protocol)
- DOSPF (Open Shortest Path First)
Show answer & explanationAnswer & explanation
Correct answer: C. EIGRP (Enhanced Interior Gateway Routing Protocol)
EIGRP uses a composite metric that primarily considers bandwidth and delay to determine the best path to a destination. This allows for more granular path selection compared to simpler metrics.
Why the other options are wrong
- A. BGP is a path-vector protocol that uses a complex set of attributes, not just bandwidth and delay, for path selection.
- B. RIP uses hop count as its metric, which is a very simple and less efficient path selection method.
- D. OSPF uses cost, which is typically derived from bandwidth, but it doesn't directly incorporate delay in its default metric calculation.
EIGRP Metric
EIGRP uses a composite metric based on bandwidth and delay (by default) to determine the best path to a destination.
- Metric is calculated using the DUAL algorithm.
- Default K-values prioritize bandwidth and delay.
- Can be tuned to include reliability, load, and MTU.
Memory trick: Every Router Intelligently Guides Routes with Bandwidth and Delay.