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EIGRP was designed specifically not to waste excessive bandwidth for routing updates and
functions. If EIGRP is configured on an interface, what is the maximum percent of its
bandwidth EIGRP would use?A. 10%B. 25%C. 50%D. 75%
Ans: C
Explanation: By default, EIGRP will limit itself to using no more than 50% of the available
bandwidth.
Reference: Cisco, Configuration Notes for the Enhanced Implementation of EIGRP.
http://www.cisco.com/warp/public/103/12.html
Q7
EIGRP supports Variable Length Subnet Masking (VLSM). Which two features of EGIRP
allow it to support VLSM? (Select two)A. It advertises a routing maskB. It is a classful routing protocolC. It is a classless routing protocolD. It does not advertise a routing mask.
Ans: A, C
Explanation: EIGRP includes the routing mask when it advertises routes. EIGRP is a classless
protocol. These two features make EIGRP support VLSM.
Incorrect Anss
B: Classful routing protocols do not support VLSM.
D: The subnet mask must be included in the route to support VLSM.
Q8
Where in an EIGRP network is it most appropriate to implement route summarization?A. at area border routersB. at autonomous system boundary routersC. automatically by the DR router in each areaD. manually at any interface of any EIGRP router within the network
Ans: B
Explanation: Enhanced IGRP performs route summarization at classful network boundaries by
default. Automatic route summarization occurs at major network boundaries. ASBRs
(autonomous system boundary routers) are used at the major network boundaries.
Incorrect Anss
A, C: Area Border Router and DR are used in OSPF, but not in EIGRP.
D: Manual summarization can be done in any interface at any router within network. However,
this is not the preferred solution.
Q9
Where in an EIGRP network is it most appropriate to implement route summarization?A. At WAN interfaces.B. Manually at major network boundaries.C. Dynamically at discontiguous interfaces.D. Dynamically at major network boundaries.
Ans: D
Explanation: EIGRP supports arbitrary route summarization. Route summarization takes place
automatically at major network boundaries (where network are supernetted).
Note: Route summarization is the consolidation of advertised addresses.
Incorrect Anss
A: EIGRP supports arbitrary route summarization.
B: Route summarization is automatic in EIGRP.
C: Route summarization can only be applied at contiguous interfaces.
Q0
Assuming that your network is running EIGRP on a relatively lethargic NBMA media, by
default what would the hold time be for hello packets?A. 30 secondsB. 60 secondsC. 90 secondsD. 180 seconds
Ans: D
Explanation: EIGRP sends hello packets every 5 seconds on high bandwidth links and every 60
seconds on low bandwidth multipoint links. The hold time is typically three times the hello
interval. In this scenario, on slow NBMA media, hold time will be 180 seconds.
Reference: Enhanced Interior Gateway Routing Protocol
http://www.cisco.com/warp/public/103/eigrp1.html
Q1
Which two of the following features allow EIGRP to support classless routing? (Select two)A. Djikstra's algorithmB. discontiguous subnetsC. variable length subnet masksD. periodic update announcementsE. unequal path-cost load balancing
Ans: B, C
Explanation:
B: Discontiguous subnets are supported by EIGRP. This is a classless routing protocol feature.
C: EIGRP support variable length subnet masks (VLSM). This is a classless routing protocol
feature.
Note: Classless routing protocols include the routing mask with the route advertisement. This
enables discontiguous subnets and variable length subnet masks.
Reference: Introduction to Enhanced IGRP (EIGRP)
http://www.cisco.com/warp/public/103/1.html
How Does Unequal Cost Path Load Balancing (Variance) Work in IGRP and EIGRP?
http://www.cisco.com/warp/public/103/19.html
Incorrect Anss
A: EIGRP use the DUAL algorithm, not the Djikstra's algorithm.
D: EIGRP use periodic hello messages, not update announcements.
EIGRP use update packets to convey reachability of destinations. When a new neighbor is
discovered, Update packets are sent so the neighbor can build up its. These are not periodic
however.
E: IGRP and EIGRP support unequal cost path load balancing, which is known as variance.
However, this is not a classless feature of EIGRP.
Q2
You are a senior network administrator, and your junior administrator comes into your
office and asks you what causes a an EIGRP route to be SIA (stuck in active). How would
you respond? (Select two)A. The neighboring router stops receiving ACK packets from this router.B. The neighboring router starts receiving route updates from this router.C. The neighboring router is too busy to Ans the query (generally high CPU utilization).D. The neighboring router is having memory problems and cannot allocate the memory to
process the query or build the reply packet.
Ans: C, D
Explanation: SIA is due the fact that reply packets are not received. This could be caused by a
router which is unable to send reply packets. The router could have reached the limit of its
capacity, or it could be malfunctioning.
Notes: If a router does not receive a reply to all outstanding queries within 3 minutes, the route
goes to the stuck in active (SIA) state. The router then resets the neighbors that fail to reply by
going active on all routes known through that neighbor, and it readvertises all routes to that
neighbor.
Reference: Reference: Enhanced Interior Gateway Routing Protocol
http://www.cisco.com/warp/public/103/eigrp3.html
Incorrect Anss
A: Missing replies, not missing ACKs, cause SIA.
B: Routes updates do not cause SIA.
Q3
The EIGRP routing protocol supports give different generic packet types; however only
three of them are reliable. Which of the packet types below are the reliable ones? (Select
three)A. helloB. ACKC. replyD. queryE. update
Ans: C, D, E
Explanation:
The ACK is used for acknowledging other types of packets. Those packets are considered reliable.
Update, Query, and Reply.
Incorrect Anss
A, B: Hello and Ack are considered unreliable packets since they not require explicit
acknowledgement:
Q4
EIGRP forms relationships with its peer routers. Which three of the following statements
correctly describe these peer relationships? (Select three)A. EIGRP will form neighbors if the routers are not adjacentB. EIGRP will not form neighbors if the metric K-values do not match.C. EIGRP will not form neighbors if the router AS numbers do not match.D. EIGRP will form neighbors over primary and secondary interface addressing.E. EIGRP will form neighbors even though hello and hold timers do not match on the
peering interfaces.
Ans: B, C, E
Explanation:
B: To become neighbors the routers metric must be comparable.
C: EIGRP neighbors must have the same AS number.
E: It is possible for two routers to become EIGRP neighbors even though the hello and hold
timers don't match.
Reference: Cisco White Paper, Enhanced Interior Gateway Routing Protocol
http://www.cisco.com/warp/public/103/eigrp1.html
Incorrect Anss
A: Neighbor discovery/recovery is the process that routers use to dynamically learn of other
routers on their directly attached networks.
D: EIGRP doesn't build peer relationships over secondary addresses.
Q5
Network A is an EIGRP network with four links leading to it (Link A, Link B, Link C, &
Link D), and each of them has a Feasible Distance of 3. According to the variables below,
which link is going to be the feasible successor?A. Link A, Feasible Distance 3 and Advertise Distance 1B. Link B, Feasible Distance 5 and Advertise Distance 4C. Link C, Feasible Distance 4 and Advertise Distance 2D. Link D, Feasible Distance 4 and Advertise Distance 4
Ans: C
Explanation: Link A is the best link and it therefore the successor. Link C is the next best link,
and it is therefore the feasible successor.
Note: Feasible distance is the best metric along a path to a destination network, including the
metric to the neighbor advertising that path. Reported distance, or advertised distance, is the total
metric along a path to a destination network as advertised by an upstream neighbor. A feasible
successor is a path whose reported distance is less than the feasible distance.
Reference: Enhanced Interior Gateway Routing Protocol
http://www.cisco.com/warp/public/103/eigrp1.html
Incorrect Anss
A: Link A is the successor, not the feasible successor.
B: Both Link A and Link C are better than Link B..
D: The feasible successor must have Advertised Destination that is less than the Feasible
Distance.
Q6
Exhibit
S 62.99.153.0/24 [1/0] via 209.177.64.130
172.209.12.0/32 is subnetted, 1 subnets
D EX 172.209.1
[170/2590720] via 209.179.2.114, 06:47:28, Serial0/0/0.1239
62.113.17.0/24 is variably subnetted, 2 subnets, 2 masks
D EX 99.3.215.0/24
[170/27316] via 209.180.96.45, 09:52:10, FastEthernet11/0/0
[170/27316] via 209.180.96.44, 09:52:10, FastEthernet11/0/0
25.248.17.0/24
[90/1512111] via 209.179.66.25, 10:33:13, Serial0/0/0.1400001
[90/1512111] via 209.179.66.41, 10:33:13, Serial0/0/0.1402001
62.113.1.0/24 is variably subnetted, 12 subnets, 2 masks
D 62.113.1.227/32
[90/2611727] via 209.180.96.45, 10:33:13, FastEthernet1/0/0
[90/2611727] via 209.180.96.44, 10:33:13, FastEthernet1/0/0
S* 0.0.0.0/0 [1/0] via 209.180.96.14
From analyzing the above command output, what is the administrative distance of the
external EIGRP routes?
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