December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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50 Networking Explained, Second Edition
identifies the network to which a node is connected. In TCP/IP, this is called an Internet
address or an IP (for Internet Protocol) address. Network addresses operate at the network
layer. Each network node that is part of the Internet has a unique IP address. (Note: IP
addresses do more than simply identify the network. See Chapter 3 for additional informa-
tion about IP.) The third address is called the port address, which uniquely identifies a spe-
cific user application such as e-mail. All network applications have corresponding
identifiers called port numbers. To send a message from one node to another, a message ...
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