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pass4sure cisco ccnp Composite : 642-892 ExamExam Number/Code: 642-892

Exam Name: Composite

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“Composite”, also known as 642-892 exam, is a Cisco certification. With the complete collection of questions and answers, Pass4sure has assembled to take you through 326 Q&As to your 642-892 Exam preparation. In the 642-892 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.
Which configuration command is used to enable EIGRP unequal-cost path load
balancing?

A. maximum-paths
B. distance
C. metric
D. variance
E. default-metric
F. None of the above

Answer: D

Explanation:
EIGRP automatically load balances across links of equal cost. Whether the traffic is sent
on a predestination or round-robin basis depends on the internal switching within the
router. It is possible to configure EIGRP to load balance across unequal-cost paths using
the variance command.
The variance command allows the administrator to identify the metric scope for including
additional paths by the use of a multiplier parameter. The command structure follows:
Router(config-router)#variance multiplier
The multiplier argument is the metric value used for load balancing. It can be a value
from 1 to 128. The default is 1, which means equal-cost load balancing.
Reference: CCNP Self-Study CCNP BSCI Exam certification guide p.485

QUESTION 70
EIGRP is being used as the routing protocol within the Certkiller network. There is
an issue with EIGRP in this network and you suspect the problem lies with the
DUAL process. Which two statements about the EIGRP DUAL process are correct?
(Select two)

A. EIGRP queries are sent during the loading state in the EIGRP neighbor establishment
process.
B. An EIGRP route will go passive if there are no successors in the EIGRP topology
table.
C. A feasible successor in the EIGRP topology table can become the successor only after
all the query requests have been replied to.
D. The stuck in active state is caused when the wait for the query replies have timed out.
E. DUAL will trigger an EIGRP query process while placing the flapping routes in the
holddown state.
F. An EIGRP route will go active if there are no successors or feasible successors in the
EIGRP topology table.

Answer: D, F

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Explanation:
The focal point of EIGRP is the Diffusing Update Algorithm (DUAL). This is the
route-calculation engine of EIGRP. The full name of this technology is DUAL
finite-state machine (FSM). An FSM is an abstract machine, not a mechanical device
with moving parts. FSMs define a set of possible states that something can go through,
what events cause those states, and what events result from those states. Designers use
FSMs to describe how a device, computer program, or routing algorithm will react to a
set of input events. The DUAL FSM contains all the logic used to calculate and compare
routes in an EIGRP network.
DUAL tracks all the routes advertised by neighbors in addition to using the composite
metric of each route to compare them. DUAL also guarantees that each path is loop-free.
Lowest-cost paths are then inserted by DUAL into the routing table.
As noted earlier in the module, EIGRP keeps important route and topology information
readily available. This information is stored in a neighbor table and a topology table.
These tables supply DUAL with comprehensive route information in case of network
disruption. DUAL selects alternate routes quickly by using the information in these
tables. If a link goes down, DUAL looks for a feasible successor in its neighbor and
topology tables.
A successor is a neighboring router that is currently being used for packet forwarding. A
successor also provides the least-cost route to the destination and is not part of a routing
loop. Feasible successors provide the next lowest-cost path without introducing routing
loops. Feasible successor routes can be used in case the existing route fails. Packets to the
destination network are immediately forwarded to the feasible successor. The router is
then promoted to the status of successor
p4s cisco ccnp# Questions and Answers : 326 Q&As
# Updated: October 24th , 2008
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