A.If OSPF is the routing protocol， the path will be from R1 to R3 to R4 to R5.
B.If OSPF is the routing protocol， the path will be from R1 to R2 to R5.
C.If OSPF is the routing protocol， the path will be from R1 to R5.
D.If RIPv2 is the routing protocol， the path will be from R1 to R3 to R4 to R5.
E.If RIPv2 is the routing protocol， the path will be from R1 to R5.

A.2 through 1001
B.1 through 1001
C.1 through 1002
D.2 through 1005

A. Hosts 2， 3， and 4 will receive the broadcast. 
B. Hosts 1， 2， 3， and 4 will receive the broadcast.
C. Host 2 and the Fa0/0 interface of R1 will receive the broadcast.
D. Hosts 1， 2 and the Fa0/0 interface of R1 will receive the broadcast. 
E. Hosts 1， 2， 3， 4 and interface Fa0/0 of R1 will receive the broadcast.
F. Hosts 2， 3， 4， and interfaces Fa0/0 and Fa0/1 of R1 will receive the broadcast.

A.(config-if)#authentication ppp chap fallback ppp
B.(config-if)#authentication ppp chap pap
C.(config-if)#ppp authentication chap pap
D.(config-if)#ppp authentication chap fallback ppp

A.Bandwidth,Delay,and MTU
B.Bandwidth
C.Bandwidth and MTU
D.Bandwidth , MTU,Reliability,Delay,and Load