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Flashcards in CCNA Review Deck (17):

What are the DTE and DCE in frame relay?

DTE (data terminal equipment) are the routers that consume the frame relay. DCE (data communication equipment) are the frame relay switches that provide clocking and switching.


What is the difference between SVCs and PVCs?

Switched virtual circuits (SVC) are setup when needed and then torn down. Private virtual circuits (PVC) are predefined and similar to a leased line.


Define DLCI

Data-link connection identifiers (DLCI) are locally significant identifiers for logical circuits.


What are static versus dynamic DLCIs?

Static DLCIs are configured manually. Dynamic DLCIs use inverse arp requests to ascertain the IP addresses of their neighbors.


What is the command to configure a static DLCI?

frame-relay map ip 22 broadcast

Broadcast is used here so that routing protocols can overcome split-horizon (but it's "pseudo-broadcast", since updates will be sent unicast to each neighbor).


What is a side-effect of adding a static frame-relay neighbor?

Inverse arp will be disabled for the protocol in the static map on that DLCI.


Give the command for verifying a successful frame-relay topology?

show frame-relay map


What is LMI?

Local management interface (LMI) is the signalling protocol used between the router and DCE, which includes keepalives as well as DLCI information.


What is the default protocol on serial interfaces?

HDLC (High-level Data Link Control), which is a point-to-point protocol and does not support subinterfaces.


Give the command to enable frame-relay on interface Serial0/0

interface Serial0/0
encapsulation frame-relay


Give the command to determine whether frame-relay circuits are up

sh frame-relay pvc


Under what circumstances can inverse arp function?

Only on physical interfaces, not on sub-interfaces.


Give the command to map a static neighbor on frame-relay.

interface Serial0/0.100
frame-relay map ip X.X.X.X


Give the command to see the frame-relay settings.

sh frame-relay map


What is the clue that indicates a network type doesn't use a DR or BDR?

If it starts with "point", it doesn't elect a DR or BDR.


What is the clue that indicates a network type doesn't perform dynamic discovery?

If it has the words "non-broadcast", it requires static neighbor mappings.


Which network types use the default timers?

Only the plainest two names - "broadcast" and "point-to-point" have times of 10 seconds / 40 seconds.