It has become necessary to configure an existing serial interface to accept a second Frame Relay
virtual circuit. Which of the following procedures are required to accomplish this task? (Choose
three.)

A.
Configure each subinterface with its own IP address.

B.
Encapsulate the physical interface withmultipoint PPP.

C.
Configure static Frame Relay map entries for each subinterface network.

D.
Remove the IP address from the physical interface.

E.
Create the virtual interfaces with the interface command.

F.
Disable split horizon to prevent routing loops between the subinterface networks.

Explanation:
Normally, when only one logical virtual circuit (PVC) is assigned to a router it is placed on the
physical serial interface. To accept a second PVC, subinterfaces must be created, with each PVC
using its own logical interface as shown in the example below:
interface serial 0
encapsulation frame-relay
interface serial 0.1 point-to-point
ip address 10.0.1.1 255.255.255.0
frame-relay interface-dlci 142
interface serial 0.2 multipoint
ip address 10.0.2.1 255.255.255.0
frame-relay map 10.0.2.2 118
In this example, two virtual circuits are used (one pt-pt and one point-multipoint), each with its own
IP address. Note that the physical serial 0 interface was not assigned an IP address.