JN0-102 Question #103: Real Exam Question with Answer & Explanation

The correct answer is C. set routing-options static route 10.1.1.1/32 reject. The reject keyword, when used as the next-hop for a static route, causes matching packets to be dropped and triggers an ICMP Destination Unreachable message back to the source.

Routing Fundamentals

Question

Which command will drop a matching packet and send out a notification message?

Options

Aset routing-options static route 10.1.1.1/32 no-retain
Bset routing-options static route 10.1.1.1/32 discard
Cset routing-options static route 10.1.1.1/32 reject
Dset routing-options static route 10.1.1.1/32 no-install

Explanation

The reject keyword, when used as the next-hop for a static route, causes matching packets to be dropped and triggers an ICMP Destination Unreachable message back to the source.

Common mistakes.

A. The no-retain option prevents a static route from being retained in the routing table if its next-hop interface becomes unavailable, but it does not drop packets or send notifications.
B. The discard keyword causes packets to be dropped silently without sending any notification message, which is contrary to the requirement of sending a notification.
D. The no-install option prevents a static route from being installed into the forwarding table, meaning it won't be used for actual packet forwarding, but it doesn't actively drop packets or send notifications.

Concept tested. Static route reject next-hop behavior

Reference. https://www.juniper.net/documentation/us/en/software/junos/static-routing/topics/topic-map/static-routes-configuring.html

Topics

#static routes#route actions#reject#ICMP notification

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