CCNA Guide to Cisco Networking, Fourth Edition Chapter 11 Lab Solutions
Chapter 11 Lab Solutions
None of the labs in this chapter get saved (no copy run start). These labs are written as
if one student configures both ends of a WAN link for PPP. However, in most instances,
a team of students will be working in the lab at the same time, so one end of the link will
be configured by one student and the other end will be configured by a different student.
With regards to the Frame Relay labs, students should complete those in one sitting. In
addition, if the lab-a and lab-e routers are turned on, they will attempt to update the
Frame Relay routers and cause transmission problems. The students are instructed to
keep them turned off, but make sure they do it.
Once in a while, students will get a bad entry in their Frame Relay map that prohibits the
configuration from working. If they run the show fr map command, they will see zeroes
there. There should not be a string of zeroes. All they have to do is copy run start, and
then reload. The entries in the table will be dumped from memory and the table will
rebuild, usually correctly.
Instructor Tips Lab 11.1
Students cannot use the lab-e router in this lab because there are no active serial
interfaces on this router. The lab is written as if each student configures two connected
serial interfaces on different routers; in other words, a point-to-point link. If they work in
teams, they will not move from router to router because their teammates will be
configuring the other end of the WAN link.
Activity Questions Lab 11.1
6. Encapsulation; puts PPP encapsulation on the interface; HDLC
9. Varies depending on router but should be in the format “username lab-d
password cannon”
12. You have only configured one end of the serial link, so the link will go down
until the other end of the link is configured in the same manner.
14. Varies but either int s0/0 or int s0/1
19. Although PPP is now configured on both ends of the WAN link, the password
21. Varies depending on router but should be in the format “username lab–d
password cannon”
24. Both ends of the WAN link are now configured correctly for PPP with CHAP
and PAP.
26. PPP is considered a “peer” connection method. In other words, it connects
2
27. No encap ppp
30. Cisco’s version of HDLC is used between Cisco routers.
Review Questions Lab 11.1
1. Why is PAP considered a two-way handshake?
2. Why is CHAP considered a three-way handshake?
3. When is Cisco’s HDLC used on WAN interfaces?
4. What are the advantages of PPP compared with its predecessor SLIP?
Activity Questions Lab 11.2
4. Because both serial interfaces on the switch will be doing the clocking (DCEs).
12. Hopefully, yes
19. Hopefully, yes
30. Frame Relay switch; router
Review Questions Lab 11.2
1. What is the function of a DTE?
2. What is the function of a DCE?
3. In the case of Frame Relay, are the DTE and DCE both customer premises
equipment (CPE)?
CCNA Guide to Cisco Networking, Fourth Edition Chapter 11 Lab Solutions
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Activity Questions Lab 11.3
5. Because the router is functioning as a switch and not a router.
10. fr route 200 int s0/1 100
Review Questions Lab 11.3
1. Which WAN encapsulation was on the serial interface on the lab-c router before you
configured it for Frame Relay?
2. Why don’t you typically use the “frame-relay switching” command on a router?
3. What does the Data Link Connection Identifier (DLCI) do?
4. What is the most important parameter to negotiate in a Frame Relay contract with a
service provider?
Activity Questions Lab 11.4
4. int s0/0; ip address 199.6.13.1 255.255.255.0; no shutdown
7. router rip; version 2
12. Hopefully, yes
13. DTEs; displayed output from show fr pvc command; answer varies but either
100 or 200
14. Answer varies but should be either 199.6.13.1 or 199.6.13.2
17. Switch ports mapped to DLCIs
18. Hopefully DCE; displayed output from show fr pvc command
Review Questions Lab 11.4
1. Which show command displays statistics regarding the PVC circuit?
2. How exactly did the Frame Relay map table get built in this lab?