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Lesson 1
Determining IP Addressing Requirements
2-13
1. Which of the following statements about NAT routers and proxy servers are
true?
Choose all answers that are correct.
a. NAT routers and proxy servers must have two IP addresses.
b. A NAT router can provide Internet access to any client application on the
pri-
vate network.
c. Proxy servers can cache information they receive from Internet servers.
d. The Windows Server 2003 operating system includes a proxy server.
2. What are the two primary reasons why you should use unregistered IP
addresses
for Internet client computers?
3. Which of the following best describes the function of a subnet mask?
a. A subnet mask indicates whether an IP address is registered or
unregistered.
b. A subnet mask specifies the sizes of the network and host identifiers in
an IP
address.
c. A subnet mask is a value assigned by the IANA to uniquely identify a
specific
network on the Internet.
d. A subnet mask enables an IP address to be visible from the Internet.
Lesson Summary
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Every computer on a TCP/IP network must have a unique IP address.
■
Computers that are visible from the Internet must have IP addresses that are
reg-
istered with the IANA.
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For security, a network designer often places computers with registered IP
addresses on a separate network.
■
Computers on private networks typically use unregistered IP addresses to
protect
them from unauthorized access and to conserve the IP address space.
■
Computers with unregistered IP addresses can access the Internet as clients
using
a NAT router or a proxy server.
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