CCNA – WAN
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?
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?
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).
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.
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:
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?
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.
Hi, I had an exam and one of the questions puzzles me (I did not pass as ran out of time) so please someone explain. The question is a printout of “show frame-relay lmi”. It is asked what indicates that the network is congested. I do not remember all choices, but two of them where BECN, FECN, and 2 other choices. At the printout I see that both BECN and FECN are high numbers (let’s say 64 and 125), so in my mind both of these choices should be selected, but only one choice is allowed…. I selected FECN, but really do not know if it is right. Please explain….
The answer to ques 2 has to be B. As DLCI’s are only locally significant. R1 and R3 have no idea what’s DLCI is used at the remote end.
The DLCI 17 is between frame relay switch at provider edge and the router R2.
@ Al
The BECN notifies the source router that there is congestion in FR network.
FECN notifies the destination router that the FR nw is congested.
I am not sure what is asked in the question. but, if it asked how source will come to know about congestion then check for BECN packets at source router using # command. If there are then there is a congestion.
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@ Mayank
The answer to ques 2 has to be B. As DLCI’s are only locally significant. R1 and R3 have no idea what’s DLCI is used at the remote end.
The DLCI 17 is between frame relay switch at provider edge and the router R2.
—————————————————————————————————-
The answer can not be B but C. Since DLCIs are locally significant, just like you mentioned, We can use DLCI 17 on R1 and R3. In fact we can use the same number 17 for DLCI on R3 as well.
DLCI 17 is only locally significant to R1. It simply means if R1 can put a packet on DLCI 17, it will reach R3 because “DLCI 17 is the gate number of the tunnel that leads from R1 to R3″.
Even we can use same DLCI number 17 on R3 too. It will have nothing to do with the DLCI 17 of R1 but we can not use 17 as DLCI number for connection from R2 to R1.
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Hallo all,
i’ve a ques about Frame Relay an RIP. Well FR is a NBMA Network an we are using RIP we should add the “broadcast” argument at the end of the frame-relay map command.
What will happen, when we user RIPv2? RIPv2 is not using broadcast but a multicast 224.0.0.9
still we use the argument “broadcast” too? or just use RIPv2 instead of RIPv1?
I’ll do the exam on the 22. December. So Thanks a lot for your fast answer
Cisco Certified Network Associate CCNA
Pass4sure 640-802 Exam
Questions and Answers: 430 Q & A
Updated: Dec 21, 2010
pleas mail me zulfiqarsoomro@yahoo.com
this update version of p4s
Please help me with this question.
Which statment about RIPng is true?
A: RIPng uses broadcast to exchange routes.
B: RIPng is enabled on each interface separately.
C: There can be only one RIPng process per router.
D: RIPng allows for route up to 30 hops.
In pass4sure B is the correct answer, but I don’t get it. I think the answer is A can anyone help me with this question?
If I am wrong then whats the reason?
@Jhon
RIPng is used for IPv6, and it’s configured on each interface seperatly. There is no broadcast in IPv6 only multicasts.
normal RIP will broadcast on IPv4 if the version is 1 & will multicast if the version is 2.
Hope i clarifed it for you
What will happen, when we user RIPv2? RIPv2 is not using broadcast but a multicast 224.0.0.9
still we use the argument “broadcast” too?
—————-
Yes, because:
it allows broadcasts and multicasts over the VC. This
permits the use of dynamic routing protocols over the VC
can anyone answer this question for me:
what is the way to stop someone(say ip address 192.168.1.11/24) from telnetting to the router: i know how to do this wid extended ACLs but the question is how to do it with standard acl.
ANS::……………………………………………………………………………
: router(config)#access list 11 deny 192.168.1.11 :
: access-list 11 permit any :
: router(config)#line vty 0 4 :
: access-class 11 in :
:………………………………………………………………………….:
plz explain this thing………………
@miz…
The standard access-list deny 192.168.1.11, right. Now the statement “Line vty 0 4 and access-list 11 in” tells the router to filter traffice for the line 0 to 4 using standard acl 11. Sence in acl 11 we have denied 192.168.11, it’ll block that host to telnet inside the router….
Hopefully you’ll be care….
Regards
Muhammad Younas
hello
can any one please explain me how can i open the dumps, do i need to buy Registration code
怎么都是英语
please any body had
Cisco Certified Network Associate CCNA
Pass4sure 640-802 Exam
Questions and Answers: 430 Q & A
Updated: Dec 21, 2010
please send me
E-mail me mhsaye@tvtc.gov.sa
this update version of p4s
HI,
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Hi,
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many thanks.
Mail: exitstorm@googlemail.com
Hi
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good luck everybody..
please any body had
Cisco Certified Network Associate CCNA
Pass4sure 640-802 Exam
Questions and Answers: 430 Q & A
Updated: Dec 21, 2010
please send me
E-mail me lornie_79@yahoo.co.uk
this update version of p4s
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please any body had
Cisco Certified Network Associate CCNA
Pass4sure 640-802 Exam
Questions and Answers: 430 Q & A
Updated: Dec 21, 2010
please send me
E-mail me yemo2006@yahoo.com
this update version of p4s
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weird how the world and brain works.
can anyone please send me latest dumps Pass4sure 640-802 exam…thank you
Hi to all Good Luck
I want to practice frame relay problem in packet tracer. How can i connect the wire in subinterface? And i find cloud shape in book and 9tut example. Can we connect like those pictures??? If can be connected, then how???? please explain.
@ yogendra ,in packet tracer at down left side by pointing mouse cursor you can see WAN EMULATION by choosing it and getting generic cloud empty you can connect it ……….best of luck
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ditance greater then 550 meter
1 1000BASE-LX
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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
This is real hazy one. “Link Quality Monitoring” is used to check the error percentage of a link and disable the link if the threshold (set by the admin) is exceeded. However, it DOES NOT provide error correction automatically.
If there is another route to destination that once used the errored link, it will reroute to a new ‘better’ path. However, if the link is a strictly point to point device (IE: it only connects to one other device), the errored link will shutdown and rerouting will not be able to occur (as there is no other way to get to the destinations becuase only one link existed out of that device in the first place). This suggests to me that PPP itself does not provide error correction, rather it is the topology and the way it is designed itself which would be what the industry calls ‘hitless’ (redundant). What do you guys think about this one?
You know what…. It actually depends on the layer you are talking about as well. This is really a very complex question.
Why WAN operations focus primarily on Layer 1 and Layer 2 not Layer 3?
Could anyone detail me this process?
Kind regard,
CCNAer
@ AL
there must be an option for DISCARD ELIGIBLE, DE
if DE==1, there is congession…
please any body had
Cisco Certified Network Associate CCNA
Pass4sure 640-802 Exam
Questions and Answers: 430 Q & A
Updated: Dec 21, 2010
please send me
E-mail me sayeedshah69@yahoo.com
this update version of p4s
plz plz plz help me
@Al,
BECN is the answer. A router will send a FECN bit if it has forward congestion, then the downstream routers will send a BECN bit to the original router sending the packets. The desired result is to get the sending router to slow down its packet sending. Its hard to explain over text but if you are reading the certification guide, it is in the last bit of the frame relay chapter. Its explained really well there.
Hope this helps.
I agree with you Sarah about Q4. It provides error detection and not error correction. L4 will provide error detection in the form of TCP. Well, that’s my view anyway.
Sorry, meant to say L4 will provide error correction.
Hi,
Where can I get netsim that allows for terminal configuration to practice with, I failled my ccna with 787 point exams because I skipped the three labs due to lab practice. I’m reading on my own and want to re-seat the exams any help.
@ akbary can you send me the sims and the learning materials I have my exam on the 25th of March. Thanks
email:net2deeone@yahoo.co.uk
please any body had
Cisco Certified Network Associate CCNA
Pass4sure 640-802 Exam
Questions and Answers: 430 Q & A
Updated: Dec 21, 2010
please send me
E-mail me dpsgnn79@libero.it