Answers to Review Questions
565
Answers to Review Questions
1.
C. Internet Engineering Task Force (IETF) is the encapsulation method
used when connecting Frame Relay to non-Cisco routers.
2.
B. ISDN BRI was intended to replace standard dial-up modems.
3.
C. Frame Relay uses a PVC at the Data Link layer.
4.
D. The ISDN specification that is used for switching and signaling is
the Q specification.
5.
B, E. You can use the
show
running-config
and
show
frame-relay
pvc
commands to see the DLCI numbers configured on your router.
6.
C. The
show
frame-relay lmi
command will allow you to view the
LMI traffic statistics.
7.
D. BRI is two DS0s, which are 64Kbps each. It also has one data
channel of 16Kbps to provide clocking.
8.
C. DLCI is required to be used on each circuit with Frame Relay. The
DLCI number identifies the PVC of each circuit. PVCs are logical links
between two DTE devices.
9.
A. The
show
frame-relay
pvc
command will show the PVCs con-
figured and the associated DLCI numbers.
10.
B. Cisco uses a proprietary HDLC as the default encapsulation on all
their serial interfaces.
11.
A, B, C. The LMI provides PVC status messaging, the DLCI values
associated with a PV, and global or local significance of the DLCI
values.
12.
B. Network Control Protocol works at the LLC sublayer of the Data
Link layer and is responsible for allowing multiple Network layer
protocols to be used with Point-to-Point Protocol.
13.
A. Link Control Protocol works at the MAC sublayer of the Data Link
layer to establish, maintain, and authenticate a data-link connection.
14.
D. Data Link Connection Identifiers (DLCIs) are used to identify a
permanent virtual circuit.
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