62 Chapter 1: Building a Simple Network
?– /showclassid Adapter: Displays the DHCP class ID for a speci?¬?ed adapter. To see the
DHCP class ID for all adapters, use the asterisk (*) wildcard character in place of
Adapter. This parameter is available only on computers with adapters that are
con?¬?gured to obtain an IP address automatically.
?– /setclassid Adapter [ClassID]: Con?¬?gures the DHCP class ID for a speci?¬?ed adapter.
To set the DHCP class ID for all adapters, use the asterisk (*) wildcard character in
place of Adapter. This parameter is available only on computers with adapters that are
con?¬?gured to obtain an IP address automatically. If a DHCP class ID is not speci?¬?ed,
the current class ID is removed.
?– /?: Displays help at the command prompt.
Summary of TCP/IP??™s Internet Layer
The following list summarizes key points about TCP/IP??™s Internet layer:
?– IP network addresses consist of two parts: the network ID and the host ID.
?– IPv4 addresses have 32 bits that are divided into octets and are generally shown in
dotted decimal form (for example, 192.168.54.18).
?– IPv4 addresses are divided into A, B, and C classes to be assigned to user devices.
?– Classes D and E are used for multicast and research, respectively.
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