Watchguard Firebox X5-W Betriebsanweisung Seite 19

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User Guide 3
Introduction to Network Security
How Information Travels on the Internet
The data that you send through the Internet is cut into units, or packets. Each packet includes the Inter-
net address of the destination. 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 information to the packets, such as the sender, the recipient, and any special
instructions.
Packets traveling on the Internet
IP Addresses
To send mail to a person, you must first know their physical address. For a computer to send data to a
different computer, it must first know the address of that computer. A computer address is known as an
IP address. Only one device can use an IP address at a time.
An IP address is a group of four numbers divided by decimal points. Some examples of IP addresses are:
192.168.0.11
10.1.20.18
208.15.15.15
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