User Guide

Appendices Page 179
Gateways
A gateway can be a computer that acts as a connector between a private internal network
and another network such as the Internet. A gateway used as a firewall can transmit
information from an internal network to the Internet. Also, gateways can examine incoming
information and determine if the information is allowed access to the network.
Network Protocols
The method that used to regulate a workstation’s access to a computer network to prevent
data collisions. The SonicWALL uses the TCP/IP protocol.
• TCP/IP - Internet Protocol, or "IP", provides connectionless data transfer over a TCP/
IP network. Since IP alone does not provide end-to-end data reliability as well as some
other services, other protocols such as TCP (Transmission Control Protocol) can be
added to provide these services. 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.
• FTP - File Transfer Protocol (FTP) is used to transfer documents between different
types of computers on a TCP/IP network.
• HTTP - HyperText Transfer Protocol (HTTP) is a widely used protocol to transfer
information over the Internet. Typically, it is used to transfer information from Web
servers to Web browsers.
• UDP - User Datagram Protocol (UDP) transfers information using virtual ports between
two applications on a TCP/IP network. Slightly faster than TCP, it is not as reliable.
• DNS - Domain Name System (DNS) is a protocol that matches Internet computer
names to their corresponding IP addresses. By using DNS, a user can type in a
computer name, such as www.sonicwall.com, instead of an IP address, such as
192.168.168.168, to access a computer.
• DHCP - Dynamic Host Configuration Protocol (DHCP) allows communication between
network devices and a server that administers IP numbers. A DHCP server leases IP
addresses and other TCP/IP information to DHCP client that requests them. Typically,
a DHCP client leases an IP address for a period of time from a DHCP server which
allows a larger number of clients to use a set pool of IP addresses.
• WINS - Windows Internet Naming System (WINS), used on Microsoft
®
TCP/IP
Networks, matches Microsoft
®
network computer names to IP addresses. Using this
protocol allows computers on the Microsoft
®
network to communicate with other
networks and computers that use the TCP/IP suite.
• HTTPS - Secure HyperText Transfer Protocol (HTTPS) is a protocol to transfer
information securely over the Internet. HTTPS encrypts and decrypts information
exchanged between a Web server and a Web browser using Secure Socket Layer (SSL).
• SMTP - Simple Mail Transfer Protocol (SMTP) is used to send and receive e-mail
messages. Typically, SMTP is used only to send e-mail while another protocol, POP3,
is used to receive e-mail messages.
integrated_manual.book Page 179 Friday, October 12, 2001 2:56 PM