Watchguard Firebox X15, User Manual

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Introduction to Network Security
4 WatchGuard Firebox X Edge
How Information Travels on the Internet
The data that you send through the Internet is cut into units, or
packets. Each packet includes the Internet address of the destina-
tion. The packets that make up a connection can use different
routes through the Internet. When they all get to their destination,
they are assembled back into a file. To make sure that the packets
get to the destination, address information is added to the packets.
Data packet
The TCP and IP protocols are used to send and receive these packets.
TCP disassembles the data and assembles it again. IP adds informa-
tion to the packets, such as the sender, the recipient, and any special
instructions.
Packets traveling on the Internet