JN0-102 Question #326: Real Exam Question with Answer & Explanation

The correct answer is A. 192.168.0.0/20 D. 192.168.128.0/21 E. 192.168.64.0/24. The policy term specifies that routes must be within the 192.168.0.0/16 supernet and have a prefix length between /20 and /24 inclusive. Networks 192.168.0.0/20, 192.168.128.0/21, and 192.168.64.0/24 satisfy both of these conditions.

Routing Policy and Firewall Filters

Question

Referring to the exhibit, which three networks match the policy? (Choose three.) [edit policy-options policy-statement my-policy] user@router# show term 1 { from { route-filter 192.168.0.0/16 prefix-length-range /20-/24; } then accept; }

Options

A192.168.0.0/20
B192.168.0.0/16
C192.168.128.0/18
D192.168.128.0/21
E192.168.64.0/24

Explanation

The policy term specifies that routes must be within the 192.168.0.0/16 supernet and have a prefix length between /20 and /24 inclusive. Networks 192.168.0.0/20, 192.168.128.0/21, and 192.168.64.0/24 satisfy both of these conditions.

Common mistakes.

B. The network 192.168.0.0/16 has a prefix length of /16, which is outside the specified prefix-length-range of /20-/24.
C. The network 192.168.128.0/18 has a prefix length of /18, which is outside the specified prefix-length-range of /20-/24.

Concept tested. Junos route-filter prefix-length-range matching

Reference. https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/topic-map/policy-match-conditions.html

Topics

#routing policy#route-filter#prefix-length-range#policy matching

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