Exam 400-101 topic 1 question 106 discussion

Actual exam question from Cisco's 400-101

Question #: 106
Topic #: 1

[All 400-101 Questions]

Refer to the exhibit.

Which statement is true?

A. 2001:DB8::1/128 is a local host route, and it can be redistributed into a dynamic routing protocol.
B. 2001:DB8::1/128 is a local host route, and it cannot be redistributed into a dynamic routing protocol.
C. 2001:DB8::1/128 is a local host route that was created because ipv6 unicast-routing is not enabled on this router.
D. 2001:DB8::1/128 is a route that was put in the IPv6 routing table because one of this router's loopback interfaces has the IPv6 address 2001:DB8::1/128.

Show Suggested Answer

Suggested Answer: B 🗳️
The local routes have the administrative distance of 0. This is the same adminstrative distance as connected routes. However, when you configure redistributed connected under any routing process, the connected routes are redistributed, but the local routes are not. This behavior allows the networks to not require a large number of host routes, because the networks of the interfaces are advertised with their proper masks. These host routes are only needed on the router that owns the IP address in order to process packets destined to that IP address.
It is normal for local host routes to be listed in the IPv4 and IPv6 routing table for IP addresses of the router's interfaces. Their purpose is to create a corresponding

CEF entry as a receive entry so -
"Pass Any Exam. Any Time." - www.actualtests.com 120
that the packets destined to this IP address can be processed by the router itself. These routes cannot be redistributed into any routing protocol.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/ip-routing/116264-technote-ios-00.html

by [deleted] at April 3, 2025, 6:12 p.m.

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