HP SuperStack Firewall Series Instrukcja Użytkownika Pobierz pdf (Strona 179)

ETWORKING

ONCEPTS

This appendix contains the following:

■

Introduction to TCP/IP

■

Network Address Translation (NAT)

■

Dynamic Host Configuration Protocol (DHCP)

■

Port Numbers

■

Virtual Private Network Services

Introduction to

TCP/IP

Protocols are rules that networking hardware and software follow to

communicate with one another. The Firewall uses the TCP/IP protocol.

IP and TCP IP stands for Internet Protocol. This protocol provides connectionless data

transfer over a TCP/IP network. Because IP alone does not provide

end-to-end data reliability as well as some other services, other protocols

such as TCP can be added to provide these services. TCP stands for

Transmission Control Protocol. In TCP/IP, TCP works with IP to ensure the

integrity of the data traveling over the network. TCP/IP is the protocol of

the Internet.

IP Addressing To become part of an IP network, a network device must have an IP

address. An IP address is a unique number that differentiates one device

from another on the network to avoid confusion during communication.

To help illustrate IP addresses, the following sections compare an IP

address to the telephone numbering system, a system that is used every

day.

Like a phone number with a long distance number and area code, an IP

address contains a set of four numbers. Where the components in phone

numbers can be separated with dashes, for example,

1-408-555-1212

,IP

address number components are separated by decimal points or dots

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HP SuperStack Firewall Series Instrukcja Użytkownika Strona 179