300-420 Question #69: Real Exam Question with Answer & Explanation

The correct answer is A: distribute-list. To filter EIGRP routes exchanged between neighbors within the same autonomous system, a distribute-list is the appropriate method.

Advanced Addressing and Routing Solutions

Question

Which method will filter routes between EIGRP neighbors within the same autonomous system?

Options

Adistribute-list
Bpolicy-based routing
Cleak-map
Droute tagging

Explanation

To filter EIGRP routes exchanged between neighbors within the same autonomous system, a distribute-list is the appropriate method.

Common mistakes.

B. Policy-based routing (PBR) is used to influence the forwarding path of packets based on policies rather than routing table lookups, and it does not filter routing advertisements between neighbors.
C. A leak-map is a mechanism primarily used in OSPF to selectively re-advertise routes between areas, and it is not a direct method for filtering EIGRP routes between neighbors.
D. Route tagging is a mechanism to mark routes with specific attributes for later policy application or filtering, but it is not a method that performs the filtering itself; rather, it is used in conjunction with filtering tools like distribute-lists or route-maps.

Concept tested. EIGRP route filtering mechanisms

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-dist-list.html

Topics

#EIGRP#Route Filtering#Distribute-list

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