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

A.2001:0000:130F::099a::12a
B.2002:7654:A1AD:61:81AF:CCC1
C.FEC0:ABCD:WXYZ:0067::2A4
D.2004:1:25A4:886F::1

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.SANS
B.Cisco
C.CERT
D.ISC

A.The frame does not have MAC addresses.
B.The source MAC address in the frame is the MAC address of the NIC of Host 1.
C.The source MAC address in the frame is the MAC address of the s0/0/0 interface of R1.
D.The destination MAC address in the frame is the MAC address of the NICof server 1.
E.The destination MAC address in the frame is the MAC address of the s0/0/0 interface of R2