[Free] Download New Updated (October 2016) Cisco 200-105 Real Exam 21-30

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QUESTION 21

Which commands are required to properly configure a router to run OSPF and to add network 192.168.16.0/24 to OSPF area 0? (Choose two.)

 

A.

Router(config)# router ospf 0

B.

Router(config)# router ospf 1

C.

Router(config)# router ospf area 0

D.

Router(config-router)# network 192.168.16.0 0.0.0.255 0

E.

Router(config-router)# network 192.168.16.0 0.0.0.255 area 0

F.

Router(config-router)# network 192.168.16.0 255.255.255.0 area 0

 

Correct Answer: BE

Explanation:

In the router ospf

Command, the ranges from 1 to 65535 so o is an invalid number – B is correct but A is not correct. To configure OSPF, we need a wildcard in the “network” statement, not a subnet mask. We also need to assign an area to this process – E is correct.

 

 

QUESTION 22

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router?

 

A.

2

B.

4

C.

16

D.

unlimited

 

Correct Answer: B

Explanation:

4 is the default number of routes that OSPF will include in routing table if more than 4 equal cost routes exist for the same subnet. However, OSPF can include up to 16 equal cost routes in the routing table and perform load balancing amongst them. In order to configure this feature, you need to use the OSPF subcommand maximum-paths, i.e. maximum-paths 16.

 

 

QUESTION 23

Refer to the exhibit. When running EIGRP, what is required for RouterA to exchange routing updates with RouterC?

 

clip_image002

 

A.

AS numbers must be changed to match on all the routers

B.

Loopback interfaces must be configured so a DR is elected

C.

The no auto-summary command is needed on Router A and Router C

D.

Router B needs to have two network statements, one for each connected network

 

Correct Answer: A

Explanation:

Here we required same autonomous system between router A,B,C.Routing updated always exchange between in same EIGRP EIGRP autonomous system.you can configure more than one EIGRP autonomous system on the same router. This is typically done at a redistribution point where two EIGRP autonomous systems are interconnected. Individual router interfaces should only be included within a single EIGRP autonomous system. Cisco does not recommend running multiple EIGRP autonomous systems on the same set of interfaces on the router. If multiple EIGRP autonomous systems are used with multiple points of mutual redistribution, it can cause discrepancies in the EIGRP topology table if correct filtering is not performed at the redistribution points. If possible, Cisco recommends you configure only one EIGRP autonomous system in any single autonomous system.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 24

Refer to the exhibit. How will the router handle a packet destined for 192.0.2.156?

 

clip_image004

 

A.

The router will drop the packet.

B.

The router will return the packet to its source.

C.

The router will forward the packet via Serial2.

D.

The router will forward the packet via either Serial0 or Serial1.

 

Correct Answer: C

Explanation:

Router has pointed default router to 192.168.4.1 and this subnet is connected via serial 2 interface. Router does not have router for the 192.0.2.156. so it will use the default gateway 192.168.4.1. A default route identifies the gateway IP address to which the router sends all IP packets for which it does not have a learned or static route.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 25

Refer to the exhibit. If the router R1 returns the given output and has not had its router ID set manually, what address will EIGRP use as its router ID?

 

clip_image006

 

A.

192.168.1.2

B.

172.16.4.1

C.

192.168.10.2

D.

1.1.1.1

 

Correct Answer: D

Explanation:

The router ID is selected according to the following rules:

manual configuration

highest up/up loopback

highest up/up physical interface

 

 

QUESTION 26

Refer to the exhibit. From R1, a network administrator is able to ping the serial interface of R2 but, unable to ping any of the subnets attached to RouterB. Based on the partial outputs in the exhibit, what could be the problem?

 

clip_image008

clip_image010

 

A.

EIGRP does not support VLSM.

B.

The EIGRP network statements are incorrectly configured.

C.

The IP addressing on the serial interface of RouterA is incorrect.

D.

The routing protocol has summarized on the classful boundary.

E.

EIGRP has been configured with an invalid autonomous system number.

 

Correct Answer: D

Explanation:

CCNA – EIGRP Common Question

Reference: http://www.orbitco-ccna-pastquestions.com/CCNA—EIGRP-Common-Question.php

 

Explanation:

If you look carefully at the R2 ip route, you will discover that the R2 does not learn any network from R1; this is because the routing protocol used here (EIGRP) performs auto summary when advertising routes to peers across a network. So in this case the address 172.17.0.0/16 is a summarized address. If the router was configured with no auto summary command, R2 LAN addresses would have been advertised and reached.

 

 

QUESTION 27

What are the two default metrics used by EIGRP for route selection? (Choose two.)

 

A.

Bandwidth

B.

Delay

C.

Reliability

D.

Load

E.

MTU

 

Correct Answer: AB

Explanation:

EIGRP adds together weighted values of different network link characteristics in order to calculate a metric for evaluating path selection.

These characteristics include:

 

clip_image012Delay (measured in 10s of microseconds)

clip_image012[1]Bandwidth (measured in kilobytes per second)

clip_image012[2]Reliability (in numbers ranging from 1 to 255; 255 being the most reliable)

clip_image012[3]Load (in numbers ranging from 1 to 255; 255 being saturated)

 

Various constants (K 1 through K 5) are able to be set by a user to produce varying routing behaviors. However by default, only delay and bandwidth are used in the weighted formula to produce a single 32bit metric:

 

clip_image014

 

Note: Default K values are: K1 = K3 = 1 and K2 = K4 = K5 = 0When K5 is equal to 0 then [ K5/( K4 + reliability)] is defined to be 1

Use of the default constants effectively reduces the formula above to:

 

clip_image016

 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enhanced-interior-gateway-routing-protocol-eigrp/whitepaper_C11-720525.html

 

 

QUESTION 28

Which parameter would you tune to affect the selection of a static route as a backup, when a dynamic protocol is also being used?

 

A.

hop count

B.

administrative distance

C.

link bandwidth

D.

link delay

E.

link cost

 

Correct Answer: B

Explanation:

What Is Administrative Distance?

 

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml

 

Administrative distance is the feature that routers use in order to select the best path. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. Lowest Administrative distance will be chosen first.

 

clip_image018

 

 

QUESTION 29

Which two are advantages of static routing when compared to dynamic routing? (Choose two.)

 

A.

Configuration complexity decreases as network size increases.

B.

Security increases because only the network administrator may change the routing table.

C.

Route summarization is computed automatically by the router.

D.

Routing tables adapt automatically to topology changes.

E.

An efficient algorithm is used to build routing tables, using automatic updates.

F.

Routing updates are automatically sent to neighbors.

G.

Routing traffic load is reduced when used in stub network links.

 

Correct Answer: BG

Explanation:

When reading (or being lectured about) all the glorious details of dynamic routing protocols, it’s hard not to come away with the impression that dynamic routing is always better than static routing. It’s important to keep in mind that the primary duty of a dynamic routing protocol is to automatically detect and adapt to topological changes in the internetwork. The price of this “automation” is paid in bandwidth, security, and maybe queue space, in memory, and in processing time.

A frequent objection to static routing is that it is hard to administer. This criticism may be true of medium to large topologies with many alternative routes, but it is certainly not true of small internetworks with few or no alternative routes.

References:

http://www.ciscopress.com/articles/article.asp?p=24090&seqNum=6

http://www.ciscopress.com/articles/article.asp?p=24090

 

 

QUESTION 30

What is the default administrative distance of OSPF?

 

A.

90

B.

100

C.

110

D.

120

 

Correct Answer: C

Explanation:

Default Distance Value Table

This table lists the administrative distance default values of the protocols that Cisco supports:

 

clip_image020

 

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