Router R1 uses S0/0 to connect via a T/1 to the Frame Relay servicE. Five PVCs terminate
on the serial link. Three PVCs (101, 102, and 103) are configured on subinterface
S0/0.1, and one each (104 and 105) are on S0/0.2 and S0/0.3. The configuration shows no
configuration related to EIGRP WAN bandwidth control, and the bandwidth command is not
configured at all. Which of the following is true about how IOS tries to limit EIGRP’s use of
bandwidth on S0/0?

A.
R1 limits EIGRP to around 250Kbps on DLCI 102.

B.
R1 limits EIGRP to around 250Kbps on DLCI 104.

C.
R1 limits EIGRP to around 150Kbps on every DLCI.

D.
R1 does not limit EIGRP because noWAN bandwidth control has been configured.

Explanation:
EIGRP performs WAN bandwidth control without any explicit configuration, using default
settings. Because no bandwidth commands have been configured, each subinterface uses
the default 1544 Kbps settinG. For S0/0.1, WAN bandwidth control divides the 1544 by 3
(515 Kbps), and then takes the (default) WAN bandwidth of 50 percent, meaning about 250
Kbps for each of the three DLCIs. For the two subinterfaces with one PVC, the default 1544
is multiplied by the 50 percent default WAN bandwidth, meaning that each could use about
750 Kbps.