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a WAN, it is often referred to as an enterprise network. The Internet is currently the largest
WAN.
Firewalls
A firewall is a software or hardware system that prevents unauthorized outside access, theft,
deletion, or modification of information stored on a local network. Typically, unauthorized
access would be via an organization's Internet connection.
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.
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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
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.
TCP/IP Networks,
®
Performing the Initial Configuration Page 35
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