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Dynamic IP Address
An IP address that is automatically assigned to a client station in a TCP/IP network,
typically by a DHCP server.
Firewall
A system designed to prevent unauthorized access to or from a private network. Firewalls
can be implemented in both hardware and software, or a combination of both. Firewalls are
frequently used to prevent unauthorized Internet users from accessing private networks
connected to the Internet, especially intranets. All messages entering or leaving the intranet
pass through the firewall, which examines each message and blocks those that do not
meet the specified security criteria.
Gateway
A device, usually a router, that connects hosts on a local network to other networks.
IP Address
Every machine on the Internet has a unique identifying number, called an IP Address. A
typical IP address looks like this: 216.27.61.137
IPSec
IPSec stands for IP Security. It provides authentication and encryption over the Internet. It
functions at Layer 3 and thus secures everything on the network. It has become a standard
protocol used for virtual private networks (VPNs).
MAC Address
On a local area network (LAN) or other network, the MAC (Media Access Control) address
is your computer's unique hardware number. Usually written in the form 01:23:45:67:89:ab
MTU
The size in bytes of the largest packet that can be sent or received.
NAT
A technique by which several hosts share a single IP addree for access to the Internet.
Ping (Packet Internet Groper)
A utility to determine whether a specific IP address is accessible. It works by sending a
packet to the specified address and waiting for a reply. PING is used primarily to
troubleshoot Internet connections.
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