[Free] 2017(Feb) Ensurepass Testinsides Cisco 200-125 Practice Test 171-180

Ensurepass

CCNA Routing and Switching v3.0

 

QUESTION 171

Which two statistics appear in show frame-relay map output? (Choose two.)

 

A.

the number of BECN packets that are received by the router

B.

the value of the local DLCI

C.

the number of FECN packets that are received by the router

D.

the status of the PVC that is configured on the router

E.

the IP address of the local router

 

Correct Answer: BD

Explanation:

Sample “show frame-relay map” output:

R1#sh frame map

Serial0/0 (up): ip 10.4.4.1 dlci 401(0x191,0x6410), dynamic, broadcast,, status defined, active

Serial0/0 (up): ip 10.4.4.3 dlci 403(0x193,0x6430), dynamic, broadcast,, status defined, active

Serial0/0 (up): ip 10.4.4.4 dlci 401(0x191,0x6410), static, CISCO, status defined, active

 

QUESTION 172

At which layer of the OSI model does PPP perform?

 

A.

Layer 2

B.

Layer 3

C.

Layer 4

D.

Layer 5

 

Correct Answer: A

Explanation:

The Point-to-Point Protocol (PPP) provides a standard method for transporting multi- protocol datagrams over point-to-point links. PPP was originally emerged as an encapsulation protocol for transporting IP traffic between two peers. It is a data link layer protocol (layer 2 in the OSI model)

 

 

QUESTION 173

Which PPP subprotocol negotiates authentication options?

 

A.

NCP

B.

ISDN

C.

SLIP

D.

LCP

E.

DLCI

 

Correct Answer: D

Explanation:

The PPP Link Control Protocol (LCP) is documented in RFC 1661. LPC negotiates link and PPP parameters to dynamically configure the data link layer of a PPP connection. Common LCP options include the PPP MRU, the authentication protocol, compression of PPP header fields, callback, and multilink options.

 

 

QUESTION 174

The output of the show frame-relay pvc command shows “PVC STATUS = INACTIVE”. What does this mean?

 

A.

The PVC is configured correctly and is operating normally, but no data packets have been detected for more than five minutes.

B.

The PVC is configured correctly, is operating normally, and is no longer actively seeking the address of the remote router.

C.

The PVC is configured correctly, is operating normally, and is waiting for interesting traffic to trigger a call to the remote router.

D.

The PVC is configured correctly on the local switch, but there is a problem on the remote end of the PVC.

E.

The PVC is not configured on the local switch.

 

Correct Answer: D

Explanation:

The PVC STATUS displays the status of the PVC. The DCE device creates and sends the report to the DTE devices. There are 4 statuses:

+ ACTIVE: the PVC is operational and can transmit data

+ INACTIVE: the connection from the local router to the switch is working, but the connection to the remote router is not available

+ DELETED: the PVC is not present and no LMI information is being received from the Frame Relay switch

+ STATIC: the Local Management Interface (LMI) mechanism on the interface is disabled (by using the “no keepalive” command). This status is rarely seen so it is ignored in some books.

 

 

QUESTION 175

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 experienci
ng congestion?

 

clip_image002

 

A.

DLCI = 100

B.

last time PVC status changed 00:25:40

C.

in BECN packets 192

D.

in FECN packets 147

E.

in DE packets 0

 

Correct Answer: C

Explanation:

If device A is sending data to device B across a Frame Relay infrastructure and one of the intermediate Frame Relay switches encounters congestion, congestion being full buffers, over-subscribed port, overloaded resources, etc, it will set the BECN bit on packets being returned to the sending device and the FECN bit on the packets being sent to the receiving device.

 

 

QUESTION 176

What command is used to verify the DLCI destination address in a Frame Relay static configuration?

 

A.

show frame-relay pvc

B.

show frame-relay lmi

C.

show frame-relay map

D.

show frame relay end-to-end

 


Correct Answer: C

Explanation:

Sample “show frame-relay map” output:

R1#sh frame map

Serial0/0 (up): ip 10.4.4.1 dlci 401(0x191,0x6410), dynamic, broadcast,, status defined, active

Serial0/0 (up): ip 10.4.4.3 dlci 403(0x193,0x6430), dynamic, broadcast,, status defined, active

Serial0/0 (up): ip 10.4.4.4 dlci 401(0x191,0x6410), static, CISCO, status defined, active

 

 

QUESTION 177

Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?

 

A.

Router(config-if)# ppp authentication chap fallback ppp

B.

Router(config-if)# ppp authentication chap pap

C.

Router(config-if)# authentication ppp chap fallback ppp

D.

Router(config-if)# authentication ppp chap pap

 

Correct Answer: B

Explanation:

This command tells the router first to use CHAP and then go to PAP if CHAP isn’t available.

 

 

QUESTION 178

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.

< font style="font-size: 10pt" color="#000000">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:

Broadcast is added to the configurations of the frame relay, so the PVC supports broadcast, allowing the routing protocol updates that use the broadcast update mechanism to be forwarded across itself.

 

 

QUESTION 179

Which two options are valid WAN connectivity methods? (Choose two.)

 

A.

PPP

B.

WAP

C.

DSL

D.

L2TPv3

E.

Ethernet

 

Correct Answer: AC

Explanation:

The Point-to-Point Protocol (PPP) provides a standard method for transporting multi- protocol datagrams over point-to-point links. PPP was originally emerged as an encapsulation protocol for transporting IP traffic between two peers. It is a data link layer protocol used for WAN connections.

DSL is also considered a WAN connection, as it can be used to connect networks, typically when used with VPN technology.

QUESTION 180

Refer to the exhibit. Which statement describes DLCI 17?

 

clip_image004

 

A.

DLCI 17 describes the ISDN circuit between R2 and R3.

B.

DLCI 17 describes a PVC on R2. It cannot be used on R3 or R1.

C.

DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3.

D.

DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider.

 

Correct Answer: C

Explanation:

DLCI-Data Link Connection Identifier Bits: The DLCI serves to identify the virtual connection so that the receiving end knows which information connection a frame belongs to. Note that this DLCI has only local significance. Frame Relay is strictly a Layer 2 protocol suite.

 

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