OBTAIN AN IP ADDRESS BY USING DHCPBEFORE YOU BEGIN THIS EXERCISE, YOU...

Exam Highlights

Before taking the exam, review the key points and terms that are presented in this

chapter. You need to know this information.

Key Points

Learn the IP address ranges that fall into each of the major classes (A, B, and C)

and the default subnet mask for each class. This information will not only help

determine how a classful IP addressing scheme will apply to a situation, but also

how to customize a scheme using the classless method.

If you are troubleshooting a network problem and discover that a client computer

has an IP address on the 169.254.0.0 network, the computer has assigned itself

that address using APIPA because the computer could not locate a DHCP server.

Understand the various options available with the Ipconfig command. In particu-

lar, you should remember the following: /renew causes the computer to release

and then attempt to renew an IP address lease from a DHCP server; /release

causes the computer to release its IP address lease and not attempt to renew that

lease; and /flushdns purges the local DNS cache.

Key Terms

Automatic Private IP Addressing (APIPA) A feature that allows Windows XP Pro-

fessional to assign itself an IP address should the computer not be able to locate

a DHCP server. Addresses in the range 169.254.0.0 through 169.254.255.255 are

reserved for APIPA.

Domain Name System (DNS) A service that resolves domain names to IP addresses.

Dynamic Host Configuration Protocol (DHCP) A protocol for assigning IP

addresses automatically to hosts on a TCP/IP network.

host ID The portion of an IP address that identifies the network segment on which

a host is located.

IP address A 32-bit binary address (usually represented as four decimal numbers

ranging from 0 to 255) that uniquely identifies a network interface on a TCP/IP

network.

Ipconfig A command-line tool that allows you to view current TCP/IP configuration

information for a computer.

loopback address A special reserved IP address that represents the local computer.

network ID The portion of the IP address that identifies a particular host on a net-

work segment.

Pathping A command-line tool that is a combination of both Ping and Tracert, which

displays information about packet loss at every router between the host computer

and the remote one.

Ping A TCP/IP tool that allows you to check for connectivity between devices on a

subnet mask A number similar to an IP address in a structure that defines which

portion of an IP address is the network ID and which portion is the host ID.

Tracert A command-line tool that shows the route that data moves along a network.

Transmission Control Protocol/Internet Protocol (TCP/IP) The network proto-

col used on Windows networks and the Internet for communications between

computers and other devices.