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CCNA – Frame Relay

April 13th, 2015 Go to comments

Note: If you are not sure about Frame Relay, please read our Frame Relay Tutorial.

Question 1

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 2

Explanation

The “show frame-relay map” command displays the current map entries and information about the connections, including encapsulation type.

You can check Table 33 in the following link: http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp1029343

It clearly states there is a Field which can be Cisco or IETF, which “indicates the encapsulation type for this map”. We quote that Table 33 here for your quick reference (you will see what we want to imply in bold):

Field Description
Serial 1 (administratively down) Identifies a Frame Relay interface and its status (up or down).
ip 131.108.177.177 Destination IP address.
dlci 177 (0xB1,0x2C10)     
DLCI that identifies the logical connection being used to reach this interface. This value is displayed in three ways: its decimal value (177), its hexadecimal value (0xB1), and its value as it would appear on the wire (0x2C10).
static Indicates whether this is a static or dynamic entry.
CISCO Indicates the encapsulation type for this map; either CISCO or IETF.
TCP/IP Header Compression (inherited), passive (inherited) Indicates whether the TCP/IP header compression characteristics were inherited from the interface or were explicitly configured for the IP map.

 

The “show frame-relay lmi” gives us information about the LMI encapsulation type used by the Frame Relay interface, which can be ANSI, CISCO or Q933a. Therefore it is not what the question requires (CISCO or IETF).

Question 3

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 4

Explanation

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

BECN_FECN.jpg

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.

BECN_FECN_2.jpg

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 5

Explanation

Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the Frame Relay switch. Frames that are sent in excess of the CIR are marked as discard eligible (DE) which means they can be dropped if the congestion occurs within the Frame Relay network.

Note: In the Frame Relay frame format, there is a bit called Discard eligible (DE) bit that is used to identify frames that are first to be dropped when the CIR is exceeded.

Question 6

Question 7

Explanation

First we have to say this is an unclear question and it is wrong. The “frame-relay map ip” statement is correct thus none of the four answers above is correct. But we guess there is a typo in the output. Maybe the “ip address 172.16.100.2 255.255.0.0” command should be “ip address 172.16.100.1 255.255.0.0”. That makes answer C correct.

 

Question 8

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 9

Explanation

Local Management Interface (LMI) is a signaling standard protocol used between your router (DTE) and the first Frame Relay switch. From the output we learn this interface is sending and receiving LMI messages -> Frame Relay is being used.

Question 10

Explanation

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

Comments (35) Comments
Comment pages
1 2 3 1776
  1. Anonymous
    February 7th, 2015

    Q3, 5 today

  2. Anonymous
    February 13th, 2015

    With regards to Q2, the answer of ‘show frame-relay map’ is correct, but I see no one has really explained why that is.

    The show frame map command will show the frame-relay encap ONLY on the main interface when the main interface is configured. The show frame map command when used on a subinterface for say point-to-point will NOT show the encap type. So, if you’re using subinterfaces, the encap will default to CISCO unless otherwise configured.

  3. Che
    February 16th, 2015

    Q2, Q7, Q9 On 15th Feb.

  4. guru
    February 18th, 2015

    Q2, Q9

  5. illbwolf
    February 19th, 2015

    q3,5,8

  6. Anonymous
    March 4th, 2015

    Marcelo is absolutely right ,
    Q-2 there is nothing wrong in question-2
    Only “show frame-relay map” command shows the frame-relay encapsulation type ( cisco / ietf)
    “show interface seriial” command just gives you what kind of encapsulation you are using – HDLC , ARPA , PPP or Frame relay

  7. Bryce
    March 7th, 2015

    Q2 is correct.

    “show inter serial” is an incomplete command. Get a router, Try it exact word for word.
    LMI is not encapsulation.

    No devils advocate. Yes Show interfaces serial x/x will give you encap, however (same as cisco routing rules) the closest match for the answer is “show frame-relay map” because the question asks for encapsulation on, “a frame relay link” and not on an interface.

  8. Brad M
    March 10th, 2015

    Q4 and Q10 on exam today

  9. Peter
    March 26th, 2015

    Q1,3

  10. Manoj
    April 2nd, 2015

    I believe Bryce is correct . because you can get frame encapsulation with both commands (sh int s0/0 and sh frame-relay map). But Sh int s0/0 is showing output only for s0/0 and also command listed in answers is not complete command

  11. SaedAdi
    April 17th, 2015

    Q2,6

  12. brayan
    May 14th, 2015

    lmi is signaling protocol, you can configure with: frame-relay lmi-tye { ansi / cisco / q933a }

    you can see with:

    show frame-relay lmi

    LMI Statistics for interface Serial0/3/0 (Frame Relay DTE) LMI TYPE = CISCO <<<===

    encapsulation frame-relay is cisco or ietf

    you can configuring:

    R2(config-if)#frame-relay map ip 192.168.0.3 200 broadcast { cisco / ietf} ?
    cisco Use CISCO Encapsulation
    ietf Use RFC1490/RFC2427 Encapsulation

    you can see:

    R2#show frame-relay map
    Serial0/3/0 (up): ip 192.168.0.3 dlci 200, static,
    broadcast,
    == >> CISCO, status defined, active

  13. Amanda
    May 22nd, 2015

    If I read only 9tut…will ill be able to pass

  14. FayazH
    June 5th, 2015

    Allhumdulillah Passed today Q10 in Exam – Email me for Dumps at suhamba20022001@yahoo.com

  15. ravi
    June 12th, 2015

    q5 for my exam today if u read 9tut properly that is more than enough

  16. ravi
    June 12th, 2015

    q5 for my exam today if u read 9tut properly that is more than enough

  17. Me
    June 23rd, 2015

    For data collection only: Q2 & 9 appeared on my exam questions today. All but one question on exam WAS listed here on 9tut. Got 1000 so answers are good. (labs: ACL and EIGRP – 2 friends before me stated NAT as well.)

    Would also like to note a question I did not see on 9tut. Fairly basic, but worth note. Not verbatim or course, but: How is a private address handled if it is placed on an ISP WAN interface. A: (although strictly not true) Private addresses can not be routed on the public internet backbone (or something to that effect).

  18. Steve
    June 24th, 2015

    Q9,
    Doesn’t matter if the DLCI’s match, it just a number assigned by your ISP to track the PVC from end to end. The IP statement part of the command is what makes the end to end L2 link. Looks like they left out cisco/ietf off the end of the statement..There is just not enough information to get the right answer.

  19. Questions Today
    June 24th, 2015

    Q2,Q7 and Q9 was in exam. Praise The Lord and thnx 9tut passed on 24th june 986/1000.
    Some new questions to be observed:
    What will happen if a private IP address is assigned to a public interface connected to an ISP?
    A. Addresses in a private range will be not be routed on the Internet backbone.
    B. Only the ISP router will have the capability to access the public network.
    C. The NAT process will be used to translate this address to a valid IP address.
    D. A conflict of IP addresses happens, because other public routers can use the same range.
    Answer: A
    What are three values that must be the same within a sequence of packets for Netflow to consider
    them a network flow? (Choose three.)
    A. source IP address
    B. source MAC address
    C. egress interface
    D. ingress interface
    E. destination IP address
    F. IP next-hop
    Answer: A,D,E

  20. Anonymous
    June 26th, 2015

    download free dumps from following link
    wurl. cc/dumps

  21. 9tut
    July 12th, 2015

    @all: We had to move all the questions and answers out of 9tut. We can only keep the explanation. You can download the questions and answers at: https://mega.co.nz/#!wt9kVCjL!vvp79FTtjsqfpCgq0uTOTKlE6_qsLY6C_m163sNGs_s

  22. Nafees Mohamed
    July 15th, 2015

    First of all Many many thanks to 9tut for ur support for us. I passed the exam with 986/1000 on 8th of July 2015.

    Regarding the Question 7=>
    frame-relay map ip 172.16.100.1 100 broadcast

    The question 9tut published was wrong because in my exams I got the following frame-relay mapping

    frame-relay map ip 172.16.100.1 200 broadcast

    So the answer should be “incorrect map statement” but the explanation would be incorrect DLCI number.

    Please Consider my comment 9tut. It would help to others as well.

  23. sayfee
    August 3rd, 2015

    Question 7:
    The Command should be
    frame-relay map ip 172.16.100.1 100 broadcast

  24. Niel
    August 18th, 2015

    Hi 9tut! i would just like to ask a questions are questions here are all up to date? are they all updated weekly? are they updated regularly?

  25. niel
    August 19th, 2015

    Hi @9tut! i would just like to ask a questions are questions here are all up to date? are they all updated weekly? are they updated regularly?

  26. Rio
    September 27th, 2015

    whay there are no comments after 1 sep confirmimg that this dumps are still valid.

    DEAR 9 TUT PLEASE CONFIRM………….

  27. Rio
    September 29th, 2015

    Dear Dencio,

    This dumps are same as 9tut dumps. Thnax a lot for confirming that this dumps are still valid!!!!!!

  28. Anonymous
    September 30th, 2015

    Can anyone tell me how many questions about Frame-Relay are on the exam? Thanks in advance

  29. Anonymous
    February 8th, 2016

    Anyone with the latest dumps please send to {email not allowed}. Thank you!

  30. Anonymous
    February 13th, 2016

    Anyone with the latest dumps please send to
    abbas.raza001(at)outlook.com

    please

  31. CCNA exam 2016
    April 11th, 2016

    Hello friends.I am going to face CCNA exam within2 week ,i will be thankful if u give me info about latest ccna questions and lab. my email id-(tsemiz(at)Hotmail.de.
    Thankyou.

  32. Me
    June 16th, 2016

    Regarding Question 7 – these sample answers are different in the dumps. Here it is:
    frame-relay map ip 172.16.100.1 100 broadcast
    On the dumps it is:
    frame-relay map ip 172.16.100.1 200 broadcast.

    A DLCI of 100 is correct, but if the exams have a DLCI of 200 we are using Router B’s DLCI, not the local Router A DLCI of 100 – then the MAP statement IS INCORRECT.

  33. Aaryan
    August 29th, 2016

    Nice

  34. Bimi
    October 19th, 2016

    nice tutorial but i have and issue with question 10. is option C not also a correct answer??

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