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CCNA – WAN

April 15th, 2011 Go to comments

Here you will find answers to WAN Questions

If you are not sure about Frame Relay, please read my Frame Relay tutorial.

Question 1

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 Answers: E

Explanation:

The command frame-relay map ip 10.121.16.8 102 broadcast means to mapping the distal IP 10.121.16.8 102 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 2

Refer to the exhibit. Which statement describes DLCI 17?

wandlciunderstand1.jpg

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 Answers: C

Explanation:

DLCI stands for Data Link Connection Identifier. DLCI values are used on Frame Relay interfaces to distinguish between different virtual circuits. DLCIs have local significance because the identifier references the point between the local router and the local Frame Relay switch to which the DLCI is connected.

Question 3

A default Frame Relay WAN is classified as what type of physical network?

A: point-to-point

B: broadcast multi-access

C: nonbroadcast multi-access

D: nonbroadcast multipoint

E: broadcast point-to-multipoint

 

Correct Answer: C

Explanation:

Non-Broadcast Multi-Access (NBMA) networks are types such as Frame Relay, X.25, and Asynchronous Transfer Mode (ATM). These networks allow for multi-access, but have no broadcast ability like Ethernet

Question 4

Which of the following are key characteristics of PPP? (Choose three.)

A: can be used over analog circuits

B: maps Layer 2 to Layer 3 address

C: encapsulates several routed protocols

D: supports IP only

E: provides error correction

 

Correct Answers: A C E

Explanation

Below is some more information about PPP:

PPP (Point-to-Point Protocol) allows authentication such as Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP) and multilink connections (allow several separate physical paths to appear to be one logical path at layer 3) and can be run over asynchronous and synchronous links.

PPP can work with numerous network layer protocols, including Internet Protocol (IP), Novell’s Internetwork Packet Exchange (IPX), NBF and AppleTalk.

PPP only supports error detection, not error correction so answer E should be understood as “provides error detection”. It is a mistake of this question.

Question 5

Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN? (Choose three)

A: HDLC

B: Ethernet

C: Token Ring

D: PPP

E: FDDI

F: Frame Relay

 

Correct Answer: A D F

Question 6

Refer to the exhibit. What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown?

wandlciunderstand2.jpg

A: The Serial0/0 interface is passing traffic.

B: The DLCI 100 was dynamically allocated by the router

C: The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server

D: The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay cloud

E: The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned through Inverse ARP

 

Correct Answer: E

Explanation

The term dynamic indicates that the DLCI number and the remote router IP address 172.16.3.1 are learned via the Inverse ARP process.

Inverse ARP is a technique by which dynamic mappings are constructed in a network, allowing a device such as a router to locate the logical network address and associate it with a permanent virtual circuit (PVC).

Question 7

Which of the following describes the roles of devices in a WAN? (Choose three.)

A: A CSU/DSU terminates a digital local loop

B: A modem terminates a digital local loop

C: A CSU/DSU terminates an analog local loop

D: A modem terminates an analog local loop

E: A router is commonly considered a DTE device

F: A router is commonly considered a DCE device

Correct Answers: A D E

Explanation

The idea behind a WAN is to be able to connect two DTE networks together through a DCE network. The network’s DCE device (includes CSU/DSU) provides clocking to the DTE-connected interface (the router’s serial interface).

wan_dlci_understand

A modem modulates outgoing digital signals from a computer or other digital device to analog signals for a conventional copper twisted pair telephone line and demodulates the incoming analog signal and converts it to a digital signal for the digital device. A CSU/DSU is used between two digital lines -> A & D are correct but B & C are not correct.

For more explanation of answer D, in telephony the local loop (also referred to as a subscriber line) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the carrier or telecommunications service provider’s network. Therefore a modem terminates an analog local loop is correct.

local_loop_modem.jpg

Question 8

How should a router that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?

A: Configure a separate sub-interface for each PVC with a unique DLCI and subnet assigned to the sub-interface

B: Configure each Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic

C: Configure many sub-interfaces on the same subnet

D: Configure a single sub-interface to establish multiple PVC connections to multiple remote router interfaces

Correct Answer: A

Explanation

Look at the figure below:

wandlciunderstand5

In the figure, router R1 has two point-to-point subinterfaces. The s0.1 subinterface connects to router R3 and the s0.2 subinterface connects to router R2. Each subinterface is on a different subnet.

Question 9

What can a network administrator utilize by using PPP Layer 2 encapsulation? (Choose three.)

A: VLAN support

B: compression

C: authentication

D: sliding windows

E: multilink support

F: quality of service

 

Correct Answers: B C E

Explanation

Same as question 4

Question 10

The Frame Relay network in the diagram is not functioning properly. What is the cause of the problem?

wandlciunderstand3

A: The Gallant router has the wrong LMI type configured

B: Inverse ARP is providing the wrong PVC information to the Gallant router

C: The S3 interface of the Steele router has been configured with the frame-relay encapsulation ietf command

D: The frame-relay map statement in the Attalla router for the PVC to Steele is not correct

E: The IP address on the serial interface of the Attalla router is configured incorrectly

 

Correct Answer: D

Explanation

At Attalla router, we find a deleted status but the next map statement indicates an active status, which if for Gallant. Therefore we can deduce the map statement for the PVC from Attalla to Steele is incorrect. Incorrect DLCI assignments that are configured normally shown up as “deleted” in the frame relay maps.

Comments
Comment pages
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    March 21st, 2011

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    March 21st, 2011

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  3. Jules
    March 29th, 2011

    Can anyone help me to support the answer.
    Which two features did WPAv1 add to address the inherent weaknesses found in WEP? (choose 2)
    A. a stronger encryption algorithm
    B. Key mixing using temporal keys
    C. shared key authentication
    D. a shorter initialization vector
    E. per frame sequence counters
    The answers in ACME are B,E.
    I should choose A,B. Any explanation pls. Thanks.

  4. Stewy
    March 29th, 2011

    Ask My Ring

  5. mohamed
    April 2nd, 2011

    B E

  6. mohamed
    April 2nd, 2011

    mohamed
    B E
    hamadko11@yahoo.com

  7. ABDEL
    April 6th, 2011

    B & E

    WAP version 1, uses RC4 “Encryption Algorithm”same as WEP

  8. AndyFletcherc
    April 12th, 2011

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  9. KKK
    April 12th, 2011

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  10. eze
    April 18th, 2011

    what is the difference between a csu/dsu and a modem

  11. Jean
    April 19th, 2011

    Planning to take my ccna in a month time,I think I am 75% ready ,but still need to get some stuff right .can someone send me the latest eaxms quest & ans + latest exams, sim question .
    regards.
    pls email me at :kev_hel_17@hotmail.com

  12. Jean
    April 19th, 2011

    csu/dsu will terminate a digital circuit coming from the ISP and also provide clocking to the router ,whereas modem will terminate an anolog circuit ,for example a pstn line ,or normal home telephone line .Sometimes CSU/DSU in on the customer’s premises ,or sometimes in the Telephone exchange,but nowadays we do have WIC card (serial interfaces with in built CSU/DSU) .Some company will use pstn for OOB (Out of Band management ),e.i remote management as it is cheap ,and for that we need a modem.

  13. meth
    April 20th, 2011

    100% acl

    access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
    access-list 100 deny tcp any host 172.22.242.23 eq 80
    access-list 100 permit ip any any
    Corp1(config)#interface fa0/1
    Corp1(config-if)#ip access-group 100 out

    diff ip address

    got 100% on acl
    good luck guys

  14. Trappa
    April 27th, 2011

    Guys, who wrote and passed using this information

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    May 1st, 2011

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  16. Andre
    May 13th, 2011

    metch,

    You wrote,

    100% acl

    access-list 100 permit tcp host 192.168.33.3 host 172.22.242.23 eq 80
    access-list 100 deny tcp any host 172.22.242.23 eq 80
    access-list 100 permit ip any any
    Corp1(config)#interface fa0/1
    Corp1(config-if)#ip access-group 100 out

    diff ip address

    got 100% on acl

    I think I did exactly the same in my exam and got 25% for the ACL which I believe was the only reason I failed with my score of 775.

    What would have been different?

    Regards
    Andre

  17. tokenizer_mhoyy_2x
    May 17th, 2011

    @andre

    may question is different in actual exam

  18. jane
    May 17th, 2011

    andre

    i did the seme and did you test your connection to 172.22.242.23 ?
    i did and it was all fine and from other host also correct . it cant be unless you had q about
    acl and you gave wrong a!(multiq)

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    May 18th, 2011

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  22. Paul
    May 19th, 2011

    Which of the following are key characteristics of PPP? (Choose three.)
    A: can be used over analog circuits
    B: maps Layer 2 to Layer 3 address
    C: encapsulates several routed protocols
    D: supports IP only
    E: provides error correction

    Hey Guys, I understand A and C are correct, however, when I answer E on other tests I get it wrong. I know it provides error detection but not error correction. Does anyone know the right answer?

  23. Chaitanya varma
    May 21st, 2011

    IN OSI layers…in the following diagram.. if PC wants to send Data to another PC which is in another network.. pc can go up to transport layer segmenting data. after that what happens will that segment is passed to router for layer3 header. after that will router pass the packet to switch for layer2 header… what will happen… can any one explain.

    https://lh3.googleusercontent.com/_AB-Yxy2npec/Tb_rAd4GsJI/AAAAAAAABNg/VWtJPPD777k/s640/osi.jpg

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    May 24th, 2011

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    June 7th, 2011

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    June 11th, 2011

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  40. ja
    July 12th, 2011

    hi,
    what do you think, what is the right answer?
    What is the result of issuing the frame-relay map ip 192.168.1.2 202 broadcast command? A.defines the DLCI that is used for all packets that are sent to the 192.168.1.2 IP address B.defines the source IP address that is used in all broadcast packets on DCLI 202
    C.defines the DLCI on which packets from the 192.168.1.2 IP address are received
    D.defines the destination IP address that is used in all broadcast packets on DCLI 202

    I think it is A, but i found that it is D
    thx

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    July 15th, 2011

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  42. ef
    July 15th, 2011

    i can’t understand q10, can anybody explain it to me?

  43. Jess
    July 18th, 2011

    a “deleted” status on the frame-relay map means that the DLCI number does not exist.

  44. system32
    July 18th, 2011

    thanks jess :)

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    July 22nd, 2011

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  49. pete – kenya
    July 22nd, 2011

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    July 24th, 2011

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