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86.
Explain the relationship between reported distance and feasible distance and how they determine successors and feasible successors.
The reported distance to a route that is sent to another router is the feasible distance on the reporting router. Feasible distance is the reported distance plus the metric between the receiving and reporting routers. The route with the lowest feasible distance is the successor. Any routes with a reported distance that is less than the feasible distance are feasible successors.
87.
Determine the EIGRP command to summarize the following networks:
10.1.0.0/19
>10.1.32.0/19
10.1.64.0/19
You need to examine the third byte because that is the byte where the four prefixes differ:
0=00000000
32 = 0 0 1 0 0 0 0 0
64=01000000
96 = 0 1 1 0 0 0 0 0
The last 7 bits are irrelevant, so the mask is 1 0 0 0 0 0 0 0 and the EIGRP command is ip summary-address eigrp 1 10.1.0.0255.255.128.0.
88.
What are the purposes of areas in an OSPF network?
Areas allow the design of a hierarchical network. Routes can be summarized or blocked in an area to reduce the amount of routing information on internal OSPF routers.
89.
What is the purpose of a default route ?
A default route is used if there is not a specific entry in the routing table for the destination.
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