You need to enable the “local-router” serial 0/0 connection to the “remote-router” to be
authenticated using the “C!sco!23” password. The password cannot be sent in cleartext
between the two routers. The “remote-router” has already been configured with all the
required configurations.
Which four Cisco IOS configurations are necessary? (Choose four.)
A.
hostname local-router
B.
int s0/0
C.
encap hdlc
int s0/0
D.
encap ppp
int s0/0
E.
ppp authentication pap
int s0/0
F.
ppp authentication chap
ip domain-name test.com
G.
username remote-router password C!sco!23
H.
username local-router password C!sco!23
the correct answer should be ADEG and not ACEG. Once you encapsulate an interface with hdlc its not possible to authenticate by using pap.
I think “E” is wrong because PAP uses username/password in cleartext, so “F” should be the correct one since CHAP use MD5
After some research I think the answer should be ADFG
1. PAP sends passwords in clear text so we must use CHAP so that eliminates option E.
http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10313-config-pap.html
PAP provides a simple method for a remote node to establish its identity using a two-way handshake. After the PPP link establishment phase is complete, a username and password pair is repeatedly sent by the remote node across the link (in clear text) until authentication is acknowledged, or until the connection is terminated.
2. HDLC does not support CHAP so we must use PPP so this eliminates option C
http://www.rfwireless-world.com/Terminology/HDLC-vs-PPP.html
3. And then option A and G for the correct configuration of hostname and username and pass
http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647-understanding-ppp-chap.html
So the answer should be A D F G ???