CCNA Routing and Switching

2. Two routers connect with a serial link, each using its S0/0/0 interface. The link is
currently working using PPP. The network engineer wants to migrate to use the
Cisco-proprietary HDLC that includes a protocol type field. Which of the following
commands can be used to migrate to HDLC successfully? (Choose two answers.)
a. encapsulation hdlc
b. encapsulation cisco-hdlc
c. no encapsulation ppp
d. encapsulation-type auto
3. Which of the following PPP authentication protocols authenticates a device on the
other end of a link without sending any password information in clear text?
a. MD5
b. PAP
c. CHAP
d. DES
4. Two routers have no initial configuration whatsoever. They are connected in a lab
using a DTE cable connected to R1 and a DCE cable connected to R2, with the DTE
and DCE cables then connected to each other. The engineer wants to create a working
PPP link by configuring both routers. Which of the following commands are
required in the R1 configuration for the link to reach a state in which R1 can ping
R2’s serial IP address, assuming that the physical back-to-back link physically works?
(Choose two answers.)
a. encapsulation ppp
b. no encapsulation hdlc
c. clock rate
d. ip address
5. Consider the following excerpt from the output of a show command:
Serial0/0/1 is up, line protocol is up
Hardware is GT96K Serial
Internet address is 192.168.2.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open
Open: CDPCP, IPCP, loopback not set
Which of the following are true about this router’s S0/0/1 interface? (Choose two
answers.)
a. The interface is using HDLC.
b. The interface is using PPP.
c. The interface currently cannot pass IPv4 traffic.
d. The link should be able to pass PPP frames at the present time.