| Question 1 | If two routers are connected via Frame Relay and router A is connecting to DLCI 100, what DLCIs can router B use? A. 100 B. 101 C. 150 D. 200 E. 201 F. All of the above G. None of the above
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| A1: | Answer F is correct. The DLCI is a local configuration between the router and the CO switch. On the other side of the cloud, it makes absolutely no difference what DLCI is being used, except in relation to devices connected to that switch. Any valid connection will work no matter the numbering. Answers A, B, C, D, and E are incorrect because there is no single correct answer, and Answer G is incorrect because any of those values will work if the service provider sets it up. |
| Question 2 | What do BECNs do? A. Share a route B. Tell the router what configuration to use when talking to a switch C. Tell the switch to send more data D. Tell the router to send less data
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| A2: | Answer D is correct. A BECN tells the router that a device between the two routers can't handle it sending so much data and that if it continues to do so, packets will be dropped. Answer B refers to a DLCI, and Answers A and C aren't options. Therefore, Answers A, B, and C are incorrect. |
| Question 3 | Which ANSI standard supports SVCs for Frame Relay? A. Q.933 B. T1.617 C. 232 D. Q.922
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| A3: | Answer B is correct. Q.933 and Q.922 are ITU-T standards for SVCs over Frame Relay, and 232 is a cable standard, so Answers A, C, and D are incorrect. |
| Question 4 | CIR stands for |
| A4: | Answer D is correct. CIR stands for committed information rate, which is the guaranteed portion of the virtual circuit. Answers A, B, and C are incorrect. |
| Question 5 | Which is not an option for LMI type selection? A. Cisco B. ANSI C. IETF D. Q933a
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| A5: | Answer C is correct. All the others are valid LMI type selections, making Answers A, B, and D incorrect. |
| Question 6 | Which two are valid selections for a Frame Relay encapsulation type? (Choose two.) A. Cisco B. ANSI C. IETF D. Q933a
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| A6: | Answers A and C are correct. Cisco is the default encapsulation type, whereas you use IETF encapsulation if the router on the other side of the cloud isn't a Cisco router. Answers B and D are incorrect. |
| Question 7 | What is wrong with the following configuration? (Choose two.) Interface serial 1: encapsulation frame-relay ip address 10.1.0.1 255.255.0.0 Interface serial 1.1 point-to-point: ip address 10.2.0.1 255.255.0.0 frame-relay interface-dlci 101 bandwidth 128 frame-relay cir 64 Interface serial 1.2 point-to-point: ip address 10.3.0.1 255.255.0.0 frame-relay interface-dlci 201 bandwidth 256 frame-relay cir 64 A. The frame-relay interface-dlci statements should be frame-relay local-dlci. B. The CIR values should be one quarter of the available bandwidth. C. There should not be an IP address on the physical interface. D. Each subinterface needs the command encapsulation frame-relay placed on it. E. The frame-relay cir command goes in a map class configuration.
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| A7: | Answers C and E are correct. When using subinterfaces, you should not place a Layer 3 address on the primary interface, and CIR is specified in a map class. Answer A is incorrect because you use frame-relay local-dlci to specify a DLCI on a physical interface. You can use this command if the circuit is up but the router can't receive LMI. Answer B is wrong because there is no such rule. It's a good rule of thumb, though. Answer D is just wrong. |
| Question 8 | At least which Cisco IOS version do you need to autosense LMI type? A. 10.3 B. 11.2 C. 12.0 D. 11.1 E. 11.3
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| A8: | Answer B is correct. Cisco added autosensing to the IOS beginning with version 11.2. All other IOS versions in A, C, D, and E are incorrect. |
| Question 9 | Subinterfaces are used in a routed environment because of what? A. Split horizon B. Poison reverse C. Hold-down timers D. Routing loops
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| A9: | Answer A is correct. Split horizon tells the router not to send routing updates out the interface it learned that route from. A remote site could send a routing update and our central site router would not forward it out the same interface to other remote sites. Using subinterfaces solves this problem. Answers B and C, although dealing with ways to prevent routing loops as split horizon does, have no bearing on Frame Relay. Answer D is why we use the other three. Answers B, C, and D are incorrect. |
| Question 10 | Two types of Frame Relay connections are A. Contention-based B. Point-to-point C. Packet-based D. Multipoint
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| A10: | Answers B and D are correct. These designs reflect how many Frame Relay routers exist on the subnet. There are two in a point-to-point scenario and an unspecified number in a multipoint scenario. Answers A and C don't exist. |
| Question 11 | Frame Relay was based on what technology? A. X.25 B. ISDN C. ATM D. Token Ring
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| A11: | Answer A is correct. X.25 is the precursor to Frame Relay. Answers B, C, and D are not the precursors to Frame Relay, so those answers are incorrect. |
| Question 12 | What does DLCI stand for? A. Dynamic-link connection identifier B. Dynamic-link control identifier C. Data-link control identifier D. Data-link connection identifier
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| A12: | Answer D is correct. DLCI is the abbreviation for data-link connection identifier. Because Answers A, B, and C are not valid definitions for DLCI, they are incorrect. |
| Question 13 | Always-up circuits are called A. PVCs B. AVCs C. NVCs D. SVCs
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| A13: | Answer A is correct. Always-up circuits are called PVCs or permanent virtual circuits. Answer D stands for switched virtual circuit, a non-always up circuit. Answers B and C don't exist. |
| Question 14 | In what ways can a router get a DLCI for a circuit? (Choose two.) A. Inverse-ARP B. DHCP C. An ARP request D. Manual configuration
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| A14: | Answers A and D are correct. A router can learn the DLCI for a circuit via both Inverse-ARP and manual configuration. Multiple circuits on a single physical interface need to be manually configured. Answers B and C refer to IP processes and are incorrect. |
