New CCNA – Frame Relay
Note: If you are not sure about Frame Relay, please read our Frame Relay Tutorial.
Question 1
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 the remote route.
C. The PVC is configured correctly, is operating normally and is waiting for interesting 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 switch.
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 2
Which command allows you to verify the encapsulation type (CISCO or IETF) for a frame relay link?
A. show frame-relay map
B. show frame-relay lmi
C. show inter serial
D. show frame-relay pvc
Answer: A
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
Refer to the exhibit. Which statement describes DLCI 17?
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.
Answer: 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 4
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?
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
Answer: C
Explanation
First we should grasp the concept of BECN & FECN through an example:
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.
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
What occurs on a Frame Relay network when the CIR is exceeded?
A. All TCP traffic is marked discard eligible.
B. All UDP traffic is marked discard eligible and a BECN is sent.
C. All TCP traffic is marked discard eligible and a BECN is sent.
D. All traffic exceeding the CIR is marked discard eligible.
Answer: D
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
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
Answer: C
Question 7
|
Router 1# show running-config interface serial0/0 |
As a technician, you found the router1 is unable to reach the second router. Both routers are running IOS version 12.0.
Based on this information, what is the most likely cause of the problem?
A. incorrect IP address
B. incorrect bandwidth configuration
C. incorrect map statement
D. incorrect LMI configuration
Answer: C (In fact none is correct)
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
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?
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
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 9
Refer to the exhibit. Which WAN protocol is being used?
A. ATM
B. HDLC
C. Frame Relay
D. PPP
Answer: C
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
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.
Answer: E
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.
i think Q2 is C
I did the lab and verified the commands.
R3#sh frame-relay map
Serial2/1.200 (up): point-to-point dlci, dlci 200(0xC8,0×3080), broadcast
status defined, active
R1#sh int s1/1
Serial1/1 is up, line protocol is up
Hardware is M8T-X.21
MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation FRAME-RELAY IETF, crc 16, loopback not set
Keepalive set (10 sec)
Restart-Delay is 0 secs
Q2 is C.
R1#sh int s1/1
Serial1/1 is up, line protocol is up
Hardware is M8T-X.21
MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation FRAME-RELAY IETF, crc 16, loopback not set
Keepalive set (10 sec)
Restart-Delay is 0 secs
Q7 From Academy: It is easy to confuse the LMI and encapsulation. The LMI is a definition of the messages used between the DTE (R1) and the DCE (the Frame Relay switch owned by the service provider). Encapsulation defines the headers used by a DTE to communicate information to the DTE at the other end of a VC. The switch and its connected router care about using the same LMI. The switch does not care about the encapsulation. The endpoint routers (DTEs) do care about the encapsulation.
So i think the best answer is D
Router 1# show running-config
interface serial0/0
bandwidth 64
ip address 172.16.100.2 255.255.0.0 <—-Local Router Interface IP
encapsulation frame-relay
frame-relay map ip 172.16.100.1 100 broadcast <—— Remote Router IP and local DLCI number
The explaination
"""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″"""
is wrong cause we can not have the same ip
Answer to Q2 is C. I verified that with GNS3 and Cisco IOS image.
Q2 – It seems that answer C is true, also checked on the router.
But here is the quote from cisco doc “http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1918.html”
Encapsulation mismatch has occurred.
1. When connecting Cisco devices with non-Cisco devices, you must use IETF encapsulation on both devices. Check the encapsulation type on the Cisco device with the show frame-relay map exec command.
2. If the Cisco device is not using IETF encapsulation, use the encapsulation frame-relay ietf interface configuration command to configure IETF encapsulation on the Cisco Frame Relay interface.
For information on viewing or changing the configuration of the non-Cisco device, refer to the vendor documentation.
In the exam the command is:
frame-relay map ip 172.16.100.1 200 broadcast
The DLCI is wrong. must be 100.
Question 3 was in the exam recently
Q7 – I had my Exam today and Q7 was in the Exam. The map statement was “frame-relay map ip 172.16.100.1 200 broadcast” – with a DLCI of 200, not 100!
Hello July, Which dumps did you use?
how to check frame-relay encapsulation …
either show frame-relay map nor show int ser 1/0
is working for me ….!!!!!!!!
Router#sho int ser 1/0
Serial1/0 is up, line protocol is up (connected)
Hardware is HD64570
Internet address is 192.168.100.1/24
MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation Frame Relay, loopback not set, keepalive set (10 sec)
LMI enq sent 64, LMI stat recvd 61, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 1023 LMI type is CISCO frame relay DTE
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
Last input never, output never, output hang never
Last clearing of “show interface” counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 96 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
however ,
#show running-config ,command do shows frame-relay encapsulation type on a particular interface
#show run
output omitted !!!
interface Serial1/0
ip address 192.168.100.1 255.255.255.0
encapsulation frame-relay ietf
frame-relay interface-dlci 100
!
output omitted !!!
Q5 & Q3 in 5th Sep 2014 exam
Passed today with 958
Q7 and Q8 was on test
thanx 9tut
PASS MY EXAM TODAY SEPT 17 1000/1000
Q1, Q10 in exam today
Great staff thanks
Tomorrow I have Exam. Any valid suggestion or update or tips..
It would be appreciate .
hi guys I have my exam in one week . is there any update ? yoel2511@hotmail.com
Q1 the ” status of PVC= INACTIVE” So the option must be C not ‘ D ‘ the PVC is currently configured on the router
sorry the option for Q1 will be ‘C’
smbody pls elaborate the ans of qsn-6
Can anyone please confirm the answer of Question 2? Is it A. Show frame relay map or C. show inter serial? I am going to sit for exam within 2 days. Thanks in advance.
@Faisal.. The answer for the question 2 is A-> Show frame-relay map
Naresh,
I just saw your comment on Q1. You are mistaken.
Option C is wrong. if you read the option to the end, it talks about trigger a call by interesting “traffic” etc. This concerns switched circuit connections like ISDN.
Option D is correct answer.
good luck
q6 today
Q4, Q10 on exam yesterday
Q2 is B. It is true that prompting the “show interface serial 0/0″ for instance, will show up the encapsulation type, but the answer C only says “show interface serial” .
If you prompt “show frame-relay lmi, it will show you the TYPE.
If I am wrong, please correct me. Thank you.
Charlotte#sh frame-relay lmi
LMI Statistics for interface Serial0/0 (Frame Relay DTE) LMI TYPE = CISCO
Invalid Unnumbered info 0 Invalid Prot Disc 0
Invalid dummy Call Ref 0 Invalid Msg Type 0
Invalid Status Message 0 Invalid Lock Shift 0
Invalid Information ID 0 Invalid Report IE Len 0
Invalid Report Request 0 Invalid Keep IE Len 0
Num Status Enq. Sent 2272 Num Status msgs Rcvd 2272
Num Update Status Rcvd 0 Num Status Timeouts 0
Last Full Status Req 00:00:45 Last Full Status Rcvd 00:00:45
Hi All,
In Question-2, Option A & Option C both are correct and provide the Frame relay encapsulation details. But prefer the option A.
hi all , for Q2. 9tut answer is A. show frame-relay map
but look at Q8… it shows the output of the “show frame-relay map” and theres no encapsulation type
I guess the output in question 7 is:
frame-relay map ip 172.16.100.1 200 broadcast
in order to choose answer C
9tut can you verify pls the question number 2?? please please
Q1, Q2, Q3, Q6 and Q10 yesterday
Had test today…
Q7 did have the following”frame-relay map ip 172.16.100.1 200 broadcast” so the dlci was wrong so C does appear correct
Hi I m going to appear for ccna exam in jan 2015….can u send me the latest dumbs for ccna 200-120
Pls mail me ASAP to lontut82@yahoo.com
q1,q5…Dec 18
q9 on 11 dec
q1 today
RE Question 2
Answer A is Correct
R1#sh frame-relay map
Serial0/0/0 (up): ip 10.1.1.2 dlci 102, static,
broadcast,
CISCO, status defined, active
Serial0/0/0 (up): ip 10.1.1.3 dlci 103, static,
broadcast,
CISCO, status defined, active
R1#show frame-relay lmi
LMI Statistics for interface Serial0/0/0 (Frame Relay DTE) LMI TYPE = ANSI
Invalid Unnumbered info 0 Invalid Prot Disc 0
Invalid dummy Call Ref 0 Invalid Msg Type 0
Invalid Status Message 0 Invalid Lock Shift 0
Invalid Information ID 0 Invalid Report IE Len 0
Invalid Report Request 0 Invalid Keep IE Len 0
Num Status Enq. Sent 10 Num Status msgs Rcvd 9
Num Update Status Rcvd 0 Num Status Timeouts 16
R1#show int serial 0/0/0
Serial0/0/0 is up, line protocol is up (connected)
Hardware is HD64570
Internet address is 10.1.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation Frame Relay, loopback not set, keepalive set (10 sec)
LMI enq sent 99, LMI stat recvd 98, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
*********output omitted************
R1#sh frame-relay pvc
PVC Statistics for interface Serial0/0/0 (Frame Relay DTE)
DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0/0
input pkts 14055 output pkts 32795 in bytes 1096228
out bytes 6216155 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
out bcast pkts 32795 out bcast bytes 6216155
********output omitted *******
It is very easy to now see that the Show frame-relay map command is the only one that can be correct :)
Q2,8 today
Uday, could you please confirm if all questions from 9tut >?
Khaldoun, about 98% of question may be from 9tut!
How DLCI value can be wrong.It is only locally important.
Q7
If Figure is given as indicated above has shown 100 value for router1 to router2
then it is indicative and you shall use dlci 100 in mapping with ip of Router2′s respective interface
and on Router2 200 for link to Router1 for standard description purpose only.
Else both router could use 100 or 200 (same or different) value for DLCI.both same
RAMOS1987 pls share your experiences and go on commenting for every question on this site if you know
Dear all taking ccna exam pl note
I have heard that show frame-relay map command is not working on some routers in the sim
or lab questions then you shall use show run command to see the mapping of IP and DLCI
but not leave the lab
hi all ;
any one need last pdf of ccna pass4sure of jun email to me on eng.muhanad88@gmail.com in opposite I need VCE Exam last update .
KR//
sorry for Jan
Q3, Today, 1/12/14
Q7 need explanation
Answer for Q7 must be incorrect ip addressing as per 9 tut explanation