Frame Relay Questions
Question 1
Explanation
Normal (Ethernet) ARP Request knows the Layer 3 address (IP) and requests for Layer 2 address (MAC). On the other hand, Frame Relay Inverse ARP knows the Layer 2 address (DLCI) and requests for Layer 3 address (IP) so we called it “Inverse”. For detail explanation about Inverse ARP Request please read our Frame Relay tutorial – Part 2.
Question 2
Explanation
When saying “Frame Relay point-to-point” network, it means “Frame Relay subinterfaces” run “point-to-point”. Notice that Frame Relay subinterfaces can run in two modes:
+ Point-to-Point: When a Frame Relay point-to-point subinterface is configured, the subinterface emulates a point-to-point network and OSPF treats it as a point-to-point network type
+ Multipoint: When a Frame Relay multipoint subinterface is configured, OSPF treats this subinterface as an NBMA network type.
And there are 4 network types which can be configured with OSPF. The hello & dead intervals of these types are listed below:
| Network Type | Hello Interval (secs) | Dead Interval (secs) |
| Point-to-Point | 10 | 40 |
| Point-to-Multipoint | 30 | 120 |
| Broadcast | 10 | 40 |
| Non-Broadcast | 30 | 120 |
Therefore the default OSPF hello interval on a Frame Relay point-to-point network is 10 seconds.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13693-22.html
Question 3
Explanation
Traffic shaping should be used when:
+ Hub site (headquarter) has much faster speed link than the spokes (remote sites). In this case we need to rate-limit the hub site so that it does not exceed the remote side access rate
+ Hub site has the same speed link as the spokes. For example both the headquarter and the spokes use T1 links. In this case, we need to rate-limit the remote sites so as to not overrun the hub.
An example of configuring traffic shaping is shown below:
| interface Serial0/1 encapsulation frame-relay frame-relay traffic-shaping ! interface Serial0/1.10 point-to-point ip address 10.10.10.10 255.255.255.0 frame-relay interface-dlci 10 class my_traffic_shaping ! map-class frame-relay my_traffic_shaping frame-relay adaptive-shaping becn //Configure the router to respond to frame relay frames that have the BECN bit set frame-relay cir 128000 //Specify the committed information rate (CIR) for a Frame Relay virtual circuit frame-relay bc 8000 //Specify the committed burst size (Bc) for a Frame Relay virtual circuit. frame-relay be 8000 // Specify the excess burst size (Be) for a Frame Relay virtual circuit. frame-relay mincir 64000 // Specify minimum acceptable CIR for a Frame Relay virtual circuit. |
Reference: http://www.cisco.com/c/en/us/support/docs/wan/frame-relay/6151-traffic-shaping-6151.html
Question 4
Question 5
Question 6
Question 7
Explanation
Each subinterface is treated like a physical interface so split horizon issues are overcome.
Question 8
Explanation
Frame-relay uses data-link connection identifiers (DLCIs) to build up logical circuits. The identifiers have local meaning only, that means that their values are unique per router, but not necessarily in the other routers. For example, there is only one DLCI of 23 representing for the connection from HeadQuarter to Branch 1 and only one DLCI of 51 from HeadQuarter to Branch 2. Branch 1 can use the same DLCI of 23 to represent the connection from it to HeadQuarter. Of course it can use other DLCIs as well because DLCIs are just local significant.
By including a DLCI number in the Frame Relay header, HeadQuarter can communicate with both Branch 1 and Branch 2 over the same physical circuit.
Question 9
Explanation
An example of configuring Frame Relay point-to-multipoint connections is described at: http://www.9tut.com/frame-relay-gns3-lab. Frame Relay point-to-multipoint requires inverse ARP (which is enabled by default). It requires the frame-relay mapping command to be configured also. For example: R1(config-if)#frame-relay route 102 interface Serial0/1 201.
Question 10
Explanation
LMI autosense is automatically enabled in the following situations:
+ The router is powered up or the interface changes state to up
+ The line protocol is down but the line is up
+ The interface is a Frame Relay DTE
+ The LMI type is not explicitly configured on the interface
Reference: CCIE Practical Studies: Security
I’ve been revising the questions from this site an realised that there are some additional numbers. How can I get the updated PDF questions?@Admin
@ cert
Based on https://www.cisco.com/c/en/us/td/docs/ios/12_2/wan/configuration/guide/fwan_c/wcffrely.html#wp1002120
My take is A and D.
/E
@E.T whats the correct answer ADE?
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Got a new Question.
Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)
A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
C. The device can establish a point-to-point connection to the cloud without a DLCI.
D. They can operate normally without a DLCI map.
E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.
Answer:
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Watch out everyone there is new drag and drop on this topic. Its kinda like a sim but it isn’t. Its a full frame-relay network pic with DLCI/PVC, etc. The config of the network is a fill in the blank (your drag and drop) of frame-relay…of where and what commands go where
I passed today with a 950 for my recert, I believe I got this one right cuz I had been building and trouble-shooting frame-relays for this exam and CCIE on GNS3 for a while…
Passed today,
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@ Rick
Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)
A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
C. The device can establish a point-to-point connection to the cloud without a DLCI.
D. They can operate normally without a DLCI map.
E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.
Answer:A, B
why do you think its A and B and not A and D.
You don’t necessarily need a DLCI map, with inverse ARP dlci will be obtained automatically.
so why not A and D, except you are just quoting dumps and don’t understand what you are quoting.
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Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)
A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
C. The device can establish a point-to-point connection to the cloud without a DLCI.
D. They can operate normally without a DLCI map.
E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.
my answer is A&D
“On point-to-point subinterfaces, you do not need to use the frame-relay map command to perform static address mapping, because it is always assumed that the end point of the point-to-point connection automatically resides on the same subnet as the start point. It is also not required to enable or disable Inverse ARP, because there is only a single remote destination on a point-to-point PVC and discovery is not necessary.”
http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=6
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I agree with student regarding answers to
Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)
A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
C. The device can establish a point-to-point connection to the cloud without a DLCI.
D. They can operate normally without a DLCI map.
E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.
A
“Once you create a specific type of subinterface, you cannot change it without reloading the router. For example, you cannot create a multipoint subinterface serial0.2 and then change it to point-to-point. To change it, you need to either reload the router or create another subinterface. This is the way the Frame Relay code works in Cisco IOS software.”
http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=5
D for point-to-point link the following command is used frame-relay interface-dlci xxx where xxx is dlci number assigned to that subinterface.
Is not used command: frame-relay map ip ip_address dlci_number (that is for point-to-multipoint)
Which two statements about Frame Relay Point-to-Point connections are true? (Choose Two)
A. Changing a point-to-point sub interface to a different type requires the device to be reloaded.
B. They use two DLCIs to communicate with multiple endpoints over the Frame Relay cloud.
C. The device can establish a point-to-point connection to the cloud without a DLCI.
D. They can operate normally without a DLCI map.
E. Each physical interface that extends to the Frame Relay cloud can support a single SVC.
Answers: A & D
A
“Once you create a specific type of subinterface, you cannot change it without reloading the router. For example, you cannot create a multipoint subinterface serial0.2 and then change it to point-to-point. To change it, you need to either reload the router or create another subinterface. This is the way the Frame Relay code works in Cisco IOS software.”
From Cisco Frame Relay Solutions Cisco Press 2004 ( very old)
D
For point-to-point configuration command is frame-relay interface-dlci number
and NOT frame-relay map ip ip_address dlci_number so, is posibile without dlci map
because is point-to-point link
How use frame-relay technology in our days???
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This section is no longer valid in modern exam topologies.
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