Exam 300-101 Question id=393 Network Principles

Refer to the exhibit.
Router#show adjacency Protocol Interface Address ------------------------------------------------------------ IP Serial0 192.168.209.130(2) (incomplete) IP Serial0 192.168.209.131(7) IP Ethernet0 192.168.201.1(7)
A network administrator checks this adjacency table on a router. What is a possible cause for the incomplete marking?

A. incomplete ARP information
B. incorrect ACL
C. dynamic routing protocol failure
D. serial link congestion
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To display information about the Cisco Express Forwarding adjacency table or the hardware Layer 3-switching adjacency table, use the show adjacency command.
Reasons for Incomplete Adjacencies
There are two known reasons for an incomplete adjacency:

In an MPLS environment, IP CEF should be enameled for Label Switching. Interface level command ip route-cache cef
No ARP Entry
When CEF cannot locate a valid adjacency for a destination prefix, it punts the packets to the CPU for ARP resolution and, in turn, for completion of the adjacency.

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