When configuring EIGRP to run across a 56 Kbps serial PPP link, what command do you need to
put under the serial interface ensure proper convergence of EIGRP routes?

A.
bandwidth 56

B.
bandwidth 56000

C.
ip bandwidth-percent eigrp 1 56

D.
ip bandwidth-percent eigrp 1 56000

Explanation:
When configuring serial links using EIGRP it is important to configure the bandwidth setting on the
interface. If the bandwidth setting is not changed for these interfaces EIGRP assumes the default
bandwidth on the link instead of the true bandwidth. If the link is slower, the router may not be able
to converge, routing updates might become lost, or suboptimal path selection may result.
Router(config-if)#bandwidth kilobits The value, kilobits, indicates the intended bandwidth in kilobits
per second. For generic serial interfaces, such as PPP or HDLC, set the bandwidth to the line
speed.