[Free] Download New Updated (October 2016) Cisco 200-105 Real Exam 91-100

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QUESTION 91

Which two statements about using the CHAP authentication mechanism in a PPP link are true? (Choose two.)

 

A.

CHAP uses a two-way handshake.

B.

CHAP uses a three-way handshake.

C.

CHAP authentication periodically occurs after link establishment.

D.

CHAP authentication passwords are sent in plaintext.

E.

CHAP authentication is performed only upon link establishment.

F.

CHAP has no protection from playback attacks.

 

Correct Answer: BC

Explanation:

Understanding and Configuring PPP CHAP Authentication

http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a00800b4131.shtml

 

One-Way and Two-Way Authentication

CHAP is defined as a one-way authentication method. However, you use CHAP in both directions to create a two-way authentication. Hence, with two-way CHAP, a separate three-way handshake is initiated by each side. In the Cisco CHAP implementation, by default, the called party must authenticate the calling party (unless authentication is completely turned off). Therefore, a one-way authentication initiated by the called party is the minimum possible authentication. However, the calling party can also verify the identity of the called party, and this results in a two-way authentication.

One-way authentication is often required when you connect to non-Cisco devices.

 

 

QUESTION 92

Refer to the exhibit. A technician pastes the configurations in the exhibit into the two new routers shown. Otherwise, the routers are configured with their default configurations. A ping from Host1 to Host2 fails, but the technician is able to ping the S0/0 interface of R2 from Host1. The configurations of the hosts have been verified as correct. What is the cause of the problem?

 

clip_image002

 

A.

The serial cable on R1 needs to be replaced.

B.

The interfaces on R2 are not configured properly.

C.

R1 has no route to the 192.168.1.128 network.

D.

The IP addressing scheme has overlapping subnetworks.

E.

The ip subnet-zero command must be configured on both routers.

 

Correct Answer: C

Explanation:

Whenever a node needs to send data to another node on a network, it must first know where to send it. If the node cannot directly connect to the destination node, it has to send it via other nodes along a proper route to the destination node. A remote network is a network that can only be reached by sending the packet to another router. Remote networks are added to the routing table using either a dynamic routing protocol or by configuring static routes. Static routes are routes to networks that a network administrator manually configured.So R should have static route for the 192.168.1.128.

 

 

QUESTION 93

Which protocol is an open standard protocol framework that is commonly used in VPNs, to provide secure end-to-end communications?

 

A.

RSA

B.

L2TP

C.

IPsec

D.

PPTP

 

Correct Answer: C

Explanation:

Internet Protocol Security (IPsec) is a technology protocol suite for securing Internet Protocol (IP) communications by authenticating and/or encrypting each IP packet of a communication session. IPsec also includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session.

 

 

QUESTION 94

Refer to the exhibit. A network associate has configured OSPF with the command:

 

City(config-router)# network 192.168.12.64 0.0.0.63 area 0

 

After completing the configuration, the associate discovers that not all the interfaces are participating in OSPF. Which three of the interfaces shown in the exhibit will participate in OSPF according to this configuration statement? (Choose three.)

 

clip_image004

 

A.

FastEthernet0 /0

B.

FastEthernet0 /1

C.

Serial0/0

D.

Serial0/1.102

E.

Serial0/1.103

F.

Serial0/1.104

 

Correct Answer: BCD

Explanation:

The “network 192.168.12.64 0.0.0.63 equals to network 192.168.12.64/26. This network has:Increment:

64 (/26= 1111 1111.1111 1111.1111 1111.1100 0000)

Network address: 192.168.12.64

Broadcast address: 192.168.12.127

Therefore all interface in the range of this network will join OSPF – B C D are correct.

 

 

QUESTION 95

What does the frame-relay interface-dlci command configure?

 

A.

local DLCI on the subinterface

B.

remote DLCI on the main interface

C.

remote DCLI on the subinterface

D.

local DLCI on the main interface

 

Correct Answer: A

Explanation:

Frame Relay for ICND Exam

http://www.ciscopress.com/articles/article.asp?p=100603&seqNum=3

 

To assign a data-link connection identifier (DLCI) to a specified Frame Relay subinterface on the router or access server, or to assign a specific permanent virtual circuit (PVC) to a DLCI, or to apply a virtual template configuration for a PPP session, use the frame-relay interface-dlci interface configuration command

Example 4-23 Example of frame-relay interface-dlci Command and the Output of show frame-relay map

 

R4(config)#interface s1/2.403 point-to-point

R4(config-subif)#frame-relay interface-dlci ?

<16-1007> Define a switched or locally terminated DLCI R4(config-subif)#frame-relay interface-dlci 403 ?

cisco Use CISCO Encapsulation

ietf Use RFC1490/RFC2427 Encapsulation

 

ppp Use RFC1973 Encapsulation to support PPP over FR protocol Optional protocol information for remote end

<cr>

R4#show frame-relay map

Serial1/2.403 (up): point-to-point dlci, dlci 403(0xC9,0x3090), broadcast status defined, active

R4#

 

 

 

 

 

QUESTION 96

What is the purpose of LCP?

 

A.

to perform authentication

B.

to negotiate control options

C.

to encapsulate multiple protocols

D.

to specify asynchronous versus synchronous

 

Correct Answer: B

Explanation:

In order to be sufficiently versatile to be portable to a wide variety of environments, PPP provides a Link Control Protocol (LCP). The LCP is used to automatically agree upon the encapsulation format options, handle varying limits on sizes of packets, detect a looped-back link and other common misconfiguration errors, and terminate the link. Other optional facilities provided are authentication of the identity of its peer on the link, and determination when a link is functioning properly and when it is failing.

Reference:

Link Control Protocol

http://www.ietf.org/rfc/rfc1661.txt

 

 

QUESTION 97

Users have been complaining that their Frame Relay connection to the corporate site is very slow. The network administrator suspects that the link is overloaded. Based on the partial output of the Router # show frame relay pvc command shown in the graphic, which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion?

 

clip_image006

 

A.

DLCI=100

B.

last time PVC status changed 00:25:40

C.

in BECN packets 192

D.

in FECN packets 147

E.

in DF packets 0

 

Correct Answer: C

Explanation:

First we should grasp the c
oncept of BECN & FECN through an example:

clip_image008

 

Suppose Router A wants to send data to Router B through a Frame Relay network. If the network is congested, Switch 1 (a DCE device) will set the FECN bit value of that frame to 1, indicating that frame experienced congestion in the path from source to destination. This frame is forwarded to Switch 2 and to Router B (with the FECN bit = 1).

Switch 1 knows that the network is congesting so it also sends frames back to Router A with BECN bit set to 1 to inform that path through the network is congested.

 

clip_image010

 

In general, BECN is used on frames traveling away from the congested area to warn source devices that congestion has occurred on that path while FECN is used to alert receiving devices if the frame experiences congestion.

 

BECN also informs the transmitting devices to slow down the traffic a bit until the network returns to normal state.

The question asks “which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion” which means it asks about the returned parameter which indicates congestion ->BECN.

 

 

QUESTION 98

The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command?

 

A.

This command should be executed from the global configuration mode.

B.

The IP address 10.121.16.8 is the local router port used to forward data.

C.

102 is the remote DLCI that will receive the information.

D.

This command is required for all Frame Relay configurations.

E.

The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.

 

Correct Answer: E

Explanation:

The command frame-relay map ip 10.121.16.8 102 broadcast means to map the remote IP 10.121.16.8 to the local DLCI 102. When the “broadcast” keyword is included, it turns Frame Relay network as a broadcast network, which can forward broadcasts.

 

QUESTION 99

Which feature does PPP use to encapsulate multiple protocols?

 

A.

NCP

B.

LCP

C.

IPCP

D.

IPXP

 

Correct Answer: A

Explanation:

PPP permits multiple network layer protocols to operate on the same communication link. For every network layer protocol used, a separate Network Control Protocol (NCP) is provided in order to encapsulate and negotiate options for the multiple network layer protocols. It negotiates network-layer information, e.g. network address or compression options, after the connection has been established

 

 

QUESTION 100

Which command allows you to verify the encapsulation type (CISCO o
r IETF) for a Frame Relay link?

 

A.

show frame-relay lmi

B.

show frame-relay map

C.

show frame-relay pvc

D.

show interfaces serial

 

Correct Answer: B

Explanation:

Map will show frame relay encapsulation (cisco or ietf) http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp102934 “show frame-relay map” will show frame relay encapsulation type (CISCO or IETF)

 

clip_image012

 

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