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c600_frame_relay

ccna_frame_relay

QuestionAnswer
What interface-level command is used to enable Frame Relay? Encapsulation frame-relay
What interface-level command is used to disable Inverse ARP? No frame-relay inverse-arp
What term is given to the logical connection through a path of DCEs used in Frame Relay to describe the path between two DTEs? This path is referred to as a Frame Relay cloud.
In Frame Relay, what is the Committed Information Rate? The CIR is the amount of bandwidth guaranteed to a client by the frame relay service provider.
In Frame Relay, what is the difference between a PVC and an SVC? A PVC (Permanent Virtual Circuit) is available at all times; an SVC (Switched Virtual Circuit) is available only when certain criteria are met.
What term is used for a Frame Relay topology where every router has a logical connection to every other router? This is a full-mesh network.
In a typical Frame Relay network, what device is the DCE? The DCE is a device in the service provider’s network
In a typical Frame Relay network, what device is the DTE? The DTE is a Cisco router in the local network.
What is the purpose of the Frame Relay LMI? The Frame Relay LMI (Local Management Interface) serves as a keepalive for the connection between the DCE (the service provider) and the DTE (the Cisco router).
What are the three types of Frame Relay LMI? What is the default? Ansi, Cisco, and q933a. Cisco is the default.
What Cisco feature makes it unnecessary to manually configure LMI types? LMI Autosense.
When LMI Autosense is enabled, how many LMI Status messagesdoes the DTE send? How many does the DCE return? The DTE will send three LMI Status messages – one of each LMI type (ansi, q933a, cisco). The DCE will return only one, the LMI type it’s configured to use.
Does the Frame Relay encapsulation type have to match between the DTE and DCE, or between DTEs only? The Frame Relay encap type has to match between DTEs. The DCE does not care about the encapsulation type.
What are the two Frame Relay encapsulation types? Cisco and ietf. Cisco is the default.
In Frame Relay, what does DLCI stand for? Data-Link Connection Identifier.
Do DLCIs have global significance or local significance? DLCIs have local significance only; that is, the same DLCI number can be used on different access links in the same network.
What term is given to the DLCI numbering scheme where a router in the Frame Relay network is reached via the same DLCI number from each router in the network? This is referred to as “global addressing”. It does not affect the fact that DLCIs have local significance only.
You want to use static mappings in your Frame Relay configuration, and you want no dynamic mappings to occur. What single command will prevent dynamic mappings? On the Frame Relay interfaces, configure no frame-relay inversearp.
You have a point-to-point serial subinterface running Frame Relay. You will use DLCI 687 to reach the other end of the link. What is the appropriate command to use on the subinterface? On the subinterface, run frame-relay interface-dlci 687. There is no need for a mapping statement, since frames leaving this interface have only one possible destination – it’s a point-to-point interface.
You want to change interface Serial0’s LMI type from cisco to ansi. What is the appropriate command? On Serial0, run frame-relay lmi-type ansi.
After running show frame pvc, you notice that you’re receiving a large amount frames with the FECN bit set. What does this indicate? The FECN (Forward Express Congestion Notification) bit indicates that congestion was experienced in the direction the frame was traveling.
After running show frame pvc, you notice that you’re receiving a large amount of Frame Relay headers with the BECN bit set. What does this indicate? The BECN (Backward Explicit Congestion Notification) bit indicates that congestion was experienced in the opposite direction from which the frame was traveling.
You suspect an LMI mismatch in your Frame Relay network. What is the first command to run? Show frame lmi will not only show you the LMIs that have been received, but the number of timeouts, which may indicate the line has gone down or is about to do so
What command will show you the LMI type being sent by the remote DCE? Debug frame lmi will show you the incoming LMI type.
You realize that someone has changed the LMI type of your router’s Serial0 interface away from the default. What command sets the LMI type back to the default? Under the interface configuration for Serial0, configure frame lmi-type cisco.
True or False: The term "frame relay cloud" refers to a logical connection between two DTEs that travels through a path of DCEs. Answer: True.
True or False: The term "switched virtual circuit" refers to a Frame Relay connection that is only up under certain circumstances. Answer: True. SVCs are temporary, PVCs are permanent.
True or False: The dynamic creation of PVCs cannot be prevented. Answer: False. With the command "no frame-relay inverse-arp" configured on the interface, the dynamic creation of PVCs is stopped.
True or False: In a typical Frame Relay network, the DTE is the end user. Answer: False. The DTE is generally a router, where the DCE is a device in the service provider's network.
True or False: The three types of Frame Relay LMI are ansi, cisco, and q933a, with ansi being the default. Answer: False. Those are the three types of Frame Relay LMI, but cisco is the default.
True or False: The DLCI used on different Cisco routers to reach the same destination must be the same. Answer: False. DLCIs have local significance only.
Created by: papid69
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