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QUESTION 4:
Certkiller has chosen to use EIGRP for their network routing protocol. Which three
statements are true regarding EIGRP? (Select three)
A. By default, EIGRP uses the Dijkstra algorithm to determine the best path to a
destination network based on bandwidth and delay.
B. To speed convergence, EIGRP attempts to maintain a successor and feasible successor
path for each destination.
C. EIGRP uses hellos to establish neighbor relationships.
D. By default, EIGRP performs auto-summarization across classful network boundaries.
E. EIGRP uses an area hierarchy to increase network scalability.
Answer: B, C, D
Explanation:
EIGRP routers establish adjacencies with neighbor routers by using small hello packets.
Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
3. Rediscover routers that had previously been unreachable
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EIGRP routers keep route and topology information readily available in RAM so they
can react quickly to changes. Like OSPF, EIGRP keeps this information in several tables,
or databases.
* Successor - A successor is a route selected as the primary route to use to reach a
destination. Successors are the entries kept in the routing table. Multiple successors for a
destination can be retained in the routing table.
* Feasible successor - A feasible successor is a backup route. These routes are selected
at the same time the successors are identified, but are kept in the topology table. Multiple
feasible successors for a destination can be retained in the topology table.
EIGRP automatically summarizes routes at the classful boundary, the boundary where
the network address ends as defined by class-based addressing. In most cases, auto
summarization is a good thing, keeping the routing tables as compact as possible
In the presence of discontiguous subnetworks, automatic summarization must be disabled
for routing to work properly. To turn off auto-summarization, use the following
command:
Router(config-router)#no auto-summary
QUESTION 5:
You need to configure EIGRP on all routers within the Certkiller network. Which
two statements are characteristics of the routing protocol EIGRP? (Select two)
A. Updates are sent as broadcast.
B. Updates are sent as multicast.
C. LSAs are sent to adjacent neighbors.
D. Metric values are represented in a 32-bit format for granularity.
Answer: B, D
Explanation:
EIGRP routers establish adjacencies with neighbor routers by using small hello packets.
Hellos are sent by default every five seconds. An EIGRP router assumes that as long as it
is receiving hello packets from known neighbors, those neighbors (and their routes)
remain viable. By forming adjacencies, EIGRP routers do the following:
1. Dynamically learn of new routes that join their network
2. Identify routers that become either unreachable or inoperable
642-901
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3. Rediscover routers that had previously been unreachable
QUESTION 6:
You have been tasked with setting up summarization in the Certkiller EIGRP
network. Which two statements are true about EIGRP manual summarization?
(Select two)
A. Manual summarization is configured on a per interface basis.
B. When manual summarization is configured, auto-summarization is automatically
disabled by default.
C. The summary address is assigned an administrative distance of 10 by default.
D. Manual summaries can be configured with the classful mask only.
E. The summary address is entered into the routing table and is shown to be sourced from
the Null0 interface.
Answer: A, E
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