... protocolsRouting Protocol is "igrp 64& quot;Sending updates every 5 seconds, next due in 1 seconds Invalid after 15 seconds, hold down 15, flushed after 30Outgoing update filter list for all interfaces ... thebackbone, a virtual link must be configured. Virtual links will be discussed later in the chapter. All areas inject routing information into the backbone area (area 0), and the backbone propagates ... PVCs terminating on one physical interface on RouterB. 248 Lab #32: Configuring Unicast IGRP UpdatesEquipment NeededThe following equipment is need to perform this lab exercise: One Cisco router...