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Foundation Summary 315
Foundation Summary
The Foundation Summary is a collection of tables and figures that provides a convenient review
of many key concepts in this chapter. For those of you already comfortable with the topics in
this chapter, this summary could help you recall a few details. For those of you who just read
this chapter, this review should help solidify some key facts. For any of you doing your final
prep before the exam, these tables and figures will hopefully be a convenient way to review the
day before the exam.
Table 5-36 lists the IP addressing terms used in this chapter.
Table 5-36
IP Addressing Terminology
Term
Definition
IP address
32-bit number, usually written in dotted decimal form, that uniquely
identifies an interface of some computer.
Host address
Another term for IP address.
Network
The concept of a group of hosts.
Network number
A 32-bit number, usually written in dotted decimal form, that represents
a network. This number cannot be assigned as an IP address to an
interface of some computer. The host portion of the network number
has a value of all binary 0s.
Network address
Another name for network number.
Broadcast address
A 32-bit number, usually written in dotted decimal form, that is used to
address all hosts in the network. The host portion of the broadcast
address has a value of all binary 1s. Broadcast addresses cannot be
assigned as an IP address.
Subnet
The concept of a group of hosts, which is a subdivision of a network.
Subnet number
A 32-bit number, usually written in dotted decimal form, that represents
all hosts in a subnet. This number cannot be used as an IP address for
some computer's interface.
Subnet address
Another term for subnet number.
Subnetting
The process of subdividing networks into smaller subnets. This is
jargon--for example, "Are you subnetting your network?"
Network mask
A 32-bit number, usually written in dotted decimal form. The mask is
used by computers to calculate the network number of a given IP
address by performing a Boolean AND of the address and mask. The
mask also defines the number of host bits in an address.
continues
ch05.fm Page 315 Monday, March 20, 2000 5:06 PM