User's Manual

Hub
Glossary of Terms 239
HTTPS is used to transfer
confidential user information.
Hub
A device with multiple ports,
connecting several PCs or
network devices on a network.
I
IP Address
An IP address is a 32-bit number
that identifies each computer
sending or receiving data packets
across the Internet. When you
request an HTML page or send
e-mail, the Internet Protocol part
of TCP/IP includes your IP
address in the message and sends
it to the IP address that is
obtained by looking up the
domain name in the Uniform
Resource Locator you requested
or in the e-mail address you're
sending a note to. At the other
end, the recipient can see the IP
address of the Web page
requestor or the e-mail sender
and can respond by sending
another message using the IP
address it received.
IP Spoofing
A technique where an attacker
attempts to gain unauthorized
access through a false source
address to make it appear as
though communications have
originated in a part of the
network with higher access
privileges. For example, a packet
originating on the Internet may
be masquerading as a local
packet with the source IP address
of an internal host. The firewall
can protect against IP spoofing
attacks by limiting network
access based on the gateway
interface from which data is
being received.
IPSEC
IPSEC is the leading Virtual
Private Networking (VPN)
standard. IPSEC enables
individuals or offices to establish
secure communication channels
('tunnels') over the Internet.
ISP
An ISP (Internet service
provider) is a company that
provides access to the Internet
and other related services.
L
LAN
A local area network (LAN) is a
group of computers and
associated devices that share a
common communications line
and typically share the resources
of a single server within a small
geographic area.