640-802 CCNA Study Guide - Elktech.org

eing established.
D. The hello and dead interval timers are not set to the same values on R1 and R3.
E. EIGRP is also configured on these routers with a lower administrative distance.
F. R1 and R3 are configured in different areas.
Answer: D,F
Explanation:
This question is to examine the conditions for OSPF to create neighborhood.
So as to make the two routers become neighbors, each router must be matched with the following
items:
1. The area ID and its types;
2. Hello and failure time interval timer;
3. OSPF Password (Optional);
Cisco 640-802 Exam
QUESTION NO: 191
Which statements are true about EIGRP successor routes? (Choose two.)
A. A successor route is used by EIGRP to forward traffic to a destination.
B. Successor routes are saved in the topology table to be used if the primary route fails.
C. Successor routes are flagged as "active" in the routing table.
D. A successor route may be backed up by a feasible successor route.
E. Successor routes are stored in the neighbor table following the discovery process.
Answer: A,D
Explanation:
The DUAL finite state machine embodies the decision process for all route computations.
It tracks all routes advertised by all neighbors. The distance information, known as a metric, is
used by DUAL to select efficient loop free paths.
DUAL selects routes to be inserted into a routing table based on feasible successors. A successor
is a neighboring router used for packet forwarding that has a least cost path to a destination that is
guaranteed not to be part of a routing loop. When there are no feasible successors but there are
neighbors advertising the destination, a recomputation must occur. This is the process where a
new successor is determined. The amount of time it takes to recompute the route affects the
convergence time.
Even though the recomputation is not processor-intensive, it is advantageous to avoid
recomputation if it is not necessary. When a topology change occurs, DUAL will test for feasible
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