A. issue the ip default-network command
B. use a classful routing protocol such as RIPv1
C. enable either OSPF or ISIS as the routing protocol
D. issue the ip classless command
E. do nothing, ip classless is on by default
B. use a classful routing protocol such as RIPv1
C. enable either OSPF or ISIS as the routing protocol
D. issue the ip classless command
E. do nothing, ip classless is on by default