CCNA Guide to Cisco Networking, Fourth Edition Chapter 9 Solutions
Chapter 9 Solutions
Review Questions
1. What is used on routers to hide intranet IP addresses from the Internet?
2. Which flavor of NAT maps multiple internal IP addresses to a single external address?
3. How does overlapping occur?
4. When would it be most appropriate to configure static NAT?
5. What is the purpose of the ip nat inside command?
7. Which of the following commands statically maps a name to an IP address?
8. Which of the following commands disables the default DNS lookup function on a Cisco
router?
9. Which of the following commands directs the router to a DNS server for IP–to-name
resolution?
10. If you have disabled the lookup function on your Cisco router, you will have to re-enable it
if you want to use a DNS server to resolve names on your router. True or False.
11. Which of the following is NOT a DHCP packet type?
12. What is the purpose of the service dhcp command?
13. Where is the DHCP database typically stored?
14. Which of the following are optional when configuring your router to be a DHCP server?
(Choose all that apply.)
a. Default gateway
b. IP address
15. Which of the following monitoring commands displays any IP addresses leased by the
DHCP server and the corresponding MAC address of the host?
CCNA Guide to Cisco Networking, Fourth Edition Chapter 9 Solutions
16. Which of the following monitoring commands displays DHCP pool specific information?
18. What is the difference between configuring dynamic NAT and PAT on a Cisco router using
the SDM?
19. It is easier to configure a pointer to a DNS server using the command line interface rather
than the SDM. True or False.
20. What is another name for a wildcard mask?
Case Projects
Case Project 1
The three types of NAT are static, dynamic, and PAT. Static NAT uses a one-to–one mapping of inside
to outside addresses. An inside address on a particular host will always be using the same outside
address. With dynamic NAT, outside addresses are assigned dynamically from a pool of addresses.
Case Project 2
First, it is essential that DHCP is enabled on the router. It probably is because that is the default but just
in case, the command is service dhcp. Next, you must either configure a server to hold the DHCP
database using the ip dhcp database command or you must disable conflict logging using the no ip
CCNA Guide to Cisco Networking, Fourth Edition Chapter 9 Solutions
configured; the default-router command, which will define the default gateway; and the dns-server and
netbios-name-server commands which will define the DNS and WINS server locations.
Case Project 3
Name resolution is important because without a process to do it, we would have to know the IP address
of every device we wanted to communicate with. The ip host command statically configures a hostname
to IP address mapping on a Cisco router. This is sometimes done for a few devices but it is not scalable