Which three statements are true about EIGRP route summarization? (Choose three.)
A.
Manual route summarization is configured in router configuration mode when the router is
configured for EIGRP routing.
B.
Manual route summarization is configured on the interface.
C.
When manual summarization is configured, the summary route will use the metric of the largest
specific metric of the summary routes.
D.
The ip summary-address eigrp command generates a default route with an administrative
distance of 90.
E.
The ip summary-address eigrp command generates a default route with an administrative
distance of 5.
F.
When manual summarization is configured, the router immediately creates a route that points to
null0 interface.
Explanation:
The purpose of route summarization is small routing tables, smaller updates. On major network
boundaries, subnetworks are summarized to a single classful network and automatic route
summarization is enabled by default. Manual route summarization can be configured on per
interface basis. When summarization is configured on an interface, the router immediately creates
a route pointing to null0.
Route summarization works in conjunction with the ip summary-address eigrp interface
configuration command, in which additional summarization can be performed. If automatic
summarization is in effect, there usually is no need to configure network level summaries using the
ip summary-address eigrp command. You can configure a summary aggregate address for a
specified interface. If there are any more specific routes in the routing table, EIGRP will advertise
the summary address out the interface with a metric equal to the minimum of all more specific
routeshttp://www.cisco.com/en/US/docs/ios/12_0/np1/configuration/guide/1ceigrp.html