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350-501 · Question #582

Refer to the exhibit, Company A is running OSPF within its network, comprised of routers R2, R3, R4, and R5 and consisting of two areas, Company A just acquired Company B, which uses EIGRP on its own

The correct answer is C. Apply an inbound distribute list on R2 with a route map that permits only the necessary networks. To reduce the number of EIGRP routes received on R2 from R1 and ensure only necessary routes are included, an engineer must apply an inbound distribute list on R2 for the EIGRP process, along with a route map that permits only the required networks.

Networking

Question

Refer to the exhibit, Company A is running OSPF within its network, comprised of routers R2, R3, R4, and R5 and consisting of two areas, Company A just acquired Company B, which uses EIGRP on its own R1. R1 has several routes in its routing table. The network engineering team at Company A needs access to the Company B network to manage network devices there, but each company will otherwise operate independently R2 will serve as the ASBR between the two networks. Which action must the team take to reduce the number of EIGRP routes received on R2 and include only the necessary routes in the routing table?

Exhibit

350-501 question #582 exhibit

Options

  • AApply an outbound distribute list on R3 and R4 to filter unnecessary intra-area routes from
  • BImplement an offset list on R1 for the necessary networks.
  • CApply an inbound distribute list on R2 with a route map that permits only the necessary networks
  • DAttach an access list to the R2 interface connected to R1 that denies all traffic except for the

How the community answered

(41 responses)
  • A
    15% (6)
  • B
    7% (3)
  • C
    76% (31)
  • D
    2% (1)

Why each option

To reduce the number of EIGRP routes received on R2 from R1 and ensure only necessary routes are included, an engineer must apply an inbound distribute list on R2 for the EIGRP process, along with a route map that permits only the required networks.

AApply an outbound distribute list on R3 and R4 to filter unnecessary intra-area routes from

Applying an outbound distribute list on R3 and R4 would filter OSPF routes within Company A's network, not EIGRP routes being received by R2 from R1.

BImplement an offset list on R1 for the necessary networks.

An offset list modifies routing metrics, which influences path selection in EIGRP, but it does not filter routes from being received or installed in the routing table.

CApply an inbound distribute list on R2 with a route map that permits only the necessary networksCorrect

An inbound distribute list, when applied to the EIGRP routing process on R2 in conjunction with a route map, is the precise mechanism to filter incoming EIGRP routing updates from R1, ensuring that only specified, necessary networks are installed in R2's routing table.

DAttach an access list to the R2 interface connected to R1 that denies all traffic except for the

Attaching an access list to the R2 interface connected to R1 would filter data plane traffic, not routing updates, and would prevent legitimate network communication if it denied all traffic.

Concept tested: EIGRP route filtering with distribute lists

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/ire-eigrp-xe-3s-book/ire-eigrp-distribute.html

Topics

#EIGRP#Route Filtering#Distribute Lists#Route Maps

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