Review Questions

You can find the answers in Appendix B.

1. What are the two PPP authentication methods?
   1. SLARP
   2. ARP
   3. CHAP
   4. PAP
   5. SLIP
2. Which Data Link encapsulation can be used if you have one free serial interface and many remote offices to connect?
   1. HDLC
   2. PPP
   3. Frame Relay
   4. Ethernet
3. Which of the following are considered common Data Link WAN encapsulation types? (Choose three.)
   1. PPP
   2. HDLC
   3. Frame Relay
   4. ISDN
4. Which are considered WAN connection types? (Choose three.)
   1. DLCI
   2. Packet switching
   3. Circuit switching
   4. Inverse ARP
   5. Leased lines
5. How do you configure a serial interface to use PPP encapsulation?
   1. ppp encapsulation
   2. encapsulation ppp
   3. no hdlc encapsulation, ppp encapsulation
   4. encapsulation frame-relay
6. Which encapsulations can be configured on a serial interface? (Choose three.)
   1. Ethernet
   2. Token Ring
   3. HDLC
   4. Frame Relay
   5. PPP
7. What is the default serial encapsulation used on Cisco routers?
   1. HDLC
   2. PPP
   3. SLIP
   4. Frame Relay
8. When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?
   1. Supplied by the CSU/DSU
   2. Supplied by the far end router
   3. Supplied by the clock rate command
   4. Supplied by the physical layer bit stream timing
9. You are configuring a Cisco router and connect it with a serial interface to another vendor's router's serial port. Both routers are configured with HDLC. Which two statements are true regarding this configuration?
   1. The Cisco HDLC frame uses a proprietary Type field that may not be compatible with equipment of other vendors.
   2. HDLC requires a clock rate to be configured on the routers at both ends of the serial link.
   3. PPP encapsulation is recommended for serial links between equipment from multiple vendors.
   4. Usernames must be configured at both ends of the HDLC serial link.
   5. This data link will not establish a connection because HDLC is proprietary for each vendor.
10. When PPP connections are started, the links go through three phases of session establishment. What are the phases? (Choose three.)
    1. Link establishment
    2. High Definition Link Control
    3. Authentication phase (optional)
    4. Network layer protocol phase
    5. Physical layer bit streaming timing
11. You have a Cisco LAN switch, and you need to connect your LAN to the Internet. Which device and interface configuration meets the minimum requirements for this installation?
    1. A router with two Ethernet interfaces
    2. A switch with two Ethernet interfaces
    3. A router with one Ethernet and one serial interface
    4. A switch with one Ethernet and one serial interface
    5. A router with one Ethernet and one modem interface
12. The Acme Corporation is implementing dial-up services to enable remote-office employees to connect to the local network. The company uses multiple routed protocols; needs authentication of users connecting to the network; and, since some calls will be long-distance, needs callback support. Which of the following protocols is the best choice for these remote services?
    1. 802.1
    2. Frame Relay
    3. HDLC
    4. PPP
    5. PAP
13. Which of that following is a packet-switching encapsulation?
    1. PPP
    2. Frame Relay
    3. HDLC
    4. ISDN
14. Which of the following layer 2 WAN technologies provide an optional authentication phase?
    1. HDLC
    2. PPP
    3. Frame Relay
    4. ATM
15. As shown by the following output, what is the reason the serial link between the Corp router and the Remote router will not come up?

    Corp#sh int s0/0
    Serial0/0 is up, line protocol is down
      Hardware is PowerQUICC Serial
      Internet address is 10.0.1.1/24
      MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
         reliability 254/255, txload 1/255, rxload 1/255
      Encapsulation PPP, loopback not set
    
    
    Remote#sh int s0/0
    Serial0/0 is up, line protocol is down
      Hardware is PowerQUICC Serial
      Internet address is 10.0.1.2/24
      MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
         reliability 254/255, txload 1/255, rxload 1/255
      Encapsulation HDLC, loopback not set

    1. The serial cable is faulty.
    2. The IP addresses are not in the same subnet.
    3. The subnet masks are not correct.
    4. The keepalive settings are not correct.
    5. The layer 2 frame types are not compatible.
16. What is the problem between the two routers that is causing the lack of communication?

    Corp#sh int s0/0
    Serial0/0 is up, line protocol is down
      Hardware is PowerQUICC Serial
      Internet address is 192.168.10.1/24
      MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
         reliability 254/255, txload 1/255, rxload 1/255
      Encapsulation HDLC, loopback not set
    
    
    Remote#sh int s0/0
    Serial0/0 is up, line protocol is down
      Hardware is PowerQUICC Serial
      Internet address is 192.168.11.2/24
      MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
         reliability 254/255, txload 1/255, rxload 1/255
      Encapsulation HDLC, loopback not set

    1. The serial cable is faulty.
    2. The IP addresses are not in the same subnet.
    3. The subnet masks are not correct.
    4. The keepalive settings are not correct.
    5. The layer 2 frame types are not compatible.
17. If you have a T1, what must you connect from your router to a demarc?
    1. Ethernet switches
    2. CSU/DSU
    3. Air conditioning to keep the line cool
    4. A T2 to connect the DTE to the DCE
18. Which is true regarding HDLC as implemented on a Cisco router?
    1. It is an IEEE nonproprietary protocol.
    2. It is Cisco proprietary.
    3. It can be used with PPP on the same data link.
    4. It can be used with Frame Relay on the same data link.
19. Which PPP protocol provides link establishment?
    1. HDLC
    2. LAPD
    3. LCP
    4. NCP
20. Which statement is true for DSL?
    1. DSL is backward-compatible with analog voice.
    2. DSL transmission occurs within a frequency range of 330Hz and 3.3kHz.
    3. The DSLAM is installed at the customer site.
    4. Very-high-data-rate DSL is an example of SDSL.