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300-420 · Question #66

What are three key concepts that apply when configuring the EIGRP stub routing feature in a hub and spoke network? (Choose three.)

The correct answer is B. Only remote routers are configured as stubs. C. Stub routers are not queried for routes. E. A stub router should have only EIGRP hub routers as neighbors. EIGRP stub routing is implemented on spoke routers in hub-and-spoke networks to limit query propagation and simplify routing by preventing them from being queried for routes.

Advanced Addressing and Routing Solutions

Question

What are three key concepts that apply when configuring the EIGRP stub routing feature in a hub and spoke network? (Choose three.)

Options

  • AA hub router prevents routes from being advertised to the remote router.
  • BOnly remote routers are configured as stubs.
  • CStub routers are not queried for routes.
  • DSpoke routers connected to hub routers answer the route queries for the stub router.
  • EA stub router should have only EIGRP hub routers as neighbors.
  • FEIGRP stub routing should be used on hub routers only.

How the community answered

(24 responses)
  • B
    92% (22)
  • D
    4% (1)
  • F
    4% (1)

Why each option

EIGRP stub routing is implemented on spoke routers in hub-and-spoke networks to limit query propagation and simplify routing by preventing them from being queried for routes.

AA hub router prevents routes from being advertised to the remote router.

A hub router is responsible for advertising routes to the remote (stub) routers; the stub feature on the remote router limits what the stub router itself advertises and how it responds to queries, not what the hub advertises.

BOnly remote routers are configured as stubs.Correct

EIGRP stub routing is exclusively configured on the remote or spoke routers in a hub-and-spoke topology, as these devices are at the network edge and are not intended to serve as transit points for traffic.

CStub routers are not queried for routes.Correct

A fundamental aspect of EIGRP stub routing is that stub routers are not queried by other routers for routes they may possess, which significantly reduces the scope of EIGRP queries and prevents stuck-in-active (SIA) conditions.

DSpoke routers connected to hub routers answer the route queries for the stub router.

Spoke routers configured as stubs do not answer route queries for other routers; instead, they simply respond to queries by indicating their stub status, preventing further query propagation.

EA stub router should have only EIGRP hub routers as neighbors.Correct

A router configured as an EIGRP stub should ideally only have EIGRP adjacencies with its hub router(s), as its purpose is to provide connectivity to its directly connected networks rather than serving as a transit point for other EIGRP peers.

FEIGRP stub routing should be used on hub routers only.

EIGRP stub routing is designed to be configured on the spoke or remote routers in a hub-and-spoke network to limit the propagation of queries, not on the hub routers themselves.

Concept tested: EIGRP stub routing in hub-and-spoke

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-16/ire-xe-16-book/ire-stub.html

Topics

#EIGRP#Stub Routing#Hub and Spoke#Routing Concepts

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