1. What statements are true of a Frame Relay “cloud”?
A. A Frame Relay “cloud” generally consists of logical connections.
B. A Frame Relay “cloud” generally consists of physical connections.
C. The routers on the two sides of the cloud are DTEs.
D. The routers on the two sides of the cloud are DCEs.
E. The devices in the cloud itself are DTEs.
F. The devices in the cloud itself are DCEs.
ANSWER: A, C, F. A Frame Relay “cloud” consists of logical
connections that pass through DCEs. The routers on both sides of the cloud are DTEs.
2. What statements are true of the Local Management Interface (LMI)?
Choose three.
A. Only the DCE is concerned with the LMI.
B. Only the DTE is concerned with the LMI.
C. Both the DCE and DTE are concerned with the LMI.
D. The LMIs are exchanged between the DCE and DTE.
E. The LMIs are exchanged between the two DTEs.
F. If LMIs are not received, the PVC will remain intact, but frames cannot be transmitted over that PVC.
G. If LMIs are not received, the PVC will go down.
H. The LMIs are status messages that do not affect the PVC.
ANSWER: C, D, G. LMI messages serve as the “heartbeat” of Frame Relay. The LMIs are exchanged between the DTE and DCE; they do not travel all the way across a Frame Relay cloud.
3. Which of the following are LMI types? (Choose three.) A. cisco
ANSWER: A, B, F. Cisco, ansi, and q933a are the LMI types.
4. Consider the following diagram.
LMI Autosense is in action. How many LMI status messages will the frame switch send back?
A. Zero – LMI Autosense can’t be used in this situation.
B. One.
C. Three.
D. Four – the LMI types will be returned along with a negotiation packet.
ANSWER: B. The sending device will send three LMI status messages, one of each type. The Frame Switch will return only one LMI status message, indicating to the router what LMI type will be used.
5. Which of the following is true of Frame Relay encapsulation types?
Choose two.
A. The default is cisco.
B. The default is ietf.
C. The default is q933a.
D. Only the DTEs care about the encapsulation type, and it must match on both sides of the cloud.
E. Only the DCEs care about the encapsulation type, and it must match on all DCEs throughout the cloud.
F. Both the DTEs and DCEs care about the encapsulation type, and it must match throughout the entire
transmission.
ANSWER: A, D. “cisco” is the default encapsulation type, with the other available type being “ietf”. Only the DTEs care about the
encapsulation type, and it must match on both. Where the DCEs do care about the LMI type in use, they don’t care about the
encapsulation type.
Topic Choices Who Must Agree
Encapsulation
Type CISCO, IETF Both Routers LMI Type CISCO, ANSI,
Q933A The router and its neighboring Frame Relay switch.
6. Which of the following is true of a Frame Relay DLCI?
A. “DLCI” stands for Data-Link Connection Identifier.
B. “DLCI” stands for Data-Link Configuration Identifier.
C. DLCIs have significance only on the router on which they are configured.
D. DLCIs have significance throughout the cloud; no other router can use the same DLCI, hence the term “global addressing”.
E. Virtual Circuits have one DLCI only.
F. Virtual Circuits have two DLCIs – one for the source and one for the destination.
ANSWER: A, D, E. DLCI stands for Data-Link Connection Identifier.
DLCIs do have local significance only; a DLCI number can be used on as many different routers as you like. Virtual Circuits carry only the single DLCI number.
7. When configuring static mappings in Frame Relay, which of the following should be used? (Choose two.)
A. The local IP address.
B. The remote IP address.
C. The local DLCI number.
D. The remote DLCI number.
E. The “broadcast” keyword.
F. Interesting traffic should be defined, so the PVC doesn’t stay up when not needed.
Answer: B, C. The remote IP address is mapped to the local DLCI number.
8. The three spoke routers are using the same DLCI number to reach the hub. What term best describes this numbering scheme?
A. Misconfiguration – you can’t use this numbering scheme.
B. Global Addressing C. Local Significance D. DLCI Multiplier
E. Hub-and-spoke
ANSWER: B. The term “global addressing” refers to a DLCI
numbering scheme where the remote routers all use the same DLCI number to reach a given destination. While this is a hub-and-spoke network, that term does not describe the numbering scheme.
9. You have decided not to configure manual frame mapping
statements on your Frame Relay routers. What is true of the protocol that will perform this mapping dynamically?
A. ARP will do this, and it’s enabled by default.
B. ARP will do this, but it must be manually enabled.
C. Inverse ARP will do this, and it’s enabled by default.
D. Inverse ARP will do this, but it must be manually enabled.
ANSWER: C. Inverse ARP runs automatically when Frame Relay is enabled on an interface.
10. You have decided to manually map all of your Frame Relay DLCIs.
Which of the following commands should you run before doing so?
A. enable frame manual B. no frame arp
C. no frame inverse-arp D. enable frame arp
E. enable frame inverse-arp
ANSWER: C. Inverse ARP will attempt to perform dynamic Frame Relay mappings when Frame Relay is enabled on the interface. When configuring static Frame Relay mappings, it’s advisable to turn this default behavior off with “no frame inverse-arp”.
11. You have been called in to troubleshoot a Frame Relay connection.
The PVCs are up, but routing protocol behavior on the PVCs has been unstable. You look at the configuration and see the following:
interface serial0
no frame-relay inverse-arp frame map ip 200.1.1.2 122 frame map ip 200.1.1.3 123
What is most likely the problem?
A. Inverse ARP should not have been disabled.
B. The “broadcast” keyword is missing.
C. The “protocol” keyword is missing.
D. The “pvc” keyword is missing.
ANSWER: B. Broadcasts will only travel over a Frame Relay network’s static mappings if the “broadcast” keyword is present in the mapping statement. Leaving this out will prevent routing protocols that use broadcasts from working properly over the Frame Relay cloud.
R1#show frame map
Serial0 (up): ip 200.1.1.2 dlci 122(0x7A,0x1CA0), static, broadcast,
CISCO, status defined, active
Serial0 (up): ip 200.1.1.3 dlci 123(0x7B,0x1CB0), static, broadcast,
CISCO, status defined, active
12. Consider the above console output. Which of the following is false? Select all that apply.
A. The Serial0 interface has been configured with two IP addresses, 200.1.1.2 and 200.1.1.3.
B. Inverse ARP determined these mappings.
C. Inverse ARP did not determine these mappings.
D. The IP addresses shown are remote IP addresses.
E. The DLCIs shown are remote DLCI numbers.
ANSWER: A, B, E. Note the question asked which statements are FALSE. Watch this carefully when you’re passing the CCNA exam.
The IP addresses in the mapping statements are the addresses of the remote routers, so A and E are both false. B is false; the keyword
“static” indicates that these mapping are manually configured. C and D are both true.
13. You are configuring Frame Relay on interface Serial0. You have just enabled Frame Relay encapsulation, as shown:
R1#conf t
R1(config)#interface serial0
R1(config-if)#encapsulation frame-relay At this point in the configuration, what is true?
A. Inverse ARP is enabled.
B. Inverse ARP is disabled.
C. The Frame Relay encapsulation type is “cisco”.
D. The Frame Relay encapsulation type is “ietf”.
E. The Frame Relay encapsulation type is “lmi”.
ANSWER: A, C. By default, at this point in the configuration, Inverse ARP is enabled. The Frame Relay default encapsulation type is “cisco”.
Notes