Appendix E Glossary Of Terms - D-Link DFL-900 User Manual

DFL-900/1500 User Manual Appendix E
Glossary of Terms
Appendix E
Glossary of Terms
CF (Content Filter) –
A content filter is one or more pieces of software that work together to prevent users from viewing material
found on the Internet. This process has two components.
DHCP (Dynamic Host Configuration Protocol) –
Provides a framework for passing configuration information to hosts on a TCP/IP network. DHCP is based on
BOOTP, adding the capability of automatic allocation of reusable network addresses and additional
configuration options. DHCP captures the behavior of BOOTP relay agents, and DHCP participants can
interoperate with BOOTP participants.
DHCP consists of two components: a protocol for delivering host-specific configuration parameters from a
DHCP server to a host and a mechanism for allocation of network addresses to hosts.
DMZ (Demilitarized Zone) –
From the military term for an area between two opponents where fighting is prevented. DMZ Ethernets
connect networks and computers controlled by different bodies. They may be external or internal. External
DMZ Ethernets link regional networks with routers.
Firewall –
A device that protects and controls the connection of one network to another, for traffic both entering and
leaving. Firewalls are used by companies that want to protect any network-connected server from damage
(intentional or otherwise) by those who log in to it. This could be a dedicated computer equipped with
security measures or it could be a software-based protection.
IPSec (IP Security) –
IPSec provides security for transmission of sensitive information over unprotected networks such as the
Internet. IPSec acts at the network layer, protecting and authenticating IP packets between participating
IPSec devices ("peers").
L2TP (Layer 2 Tunneling Protocol) –
Layer Two Tunneling Protocol (L2TP) is an extension of the Point-to-Point Tunneling Protocol (PPTP) used by
an Internet Service Provider (ISP) to enable the operation of a Virtual Private Network (VPN) over the
Internet. L2TP merges the best features of two other tunneling protocols: PPTP from Microsoft and L2F from
Cisco Systems. The two main components that make up L2TP are the L2TP Access Concentrator (LAC),
which is the device that physically terminates a call and the L2TP Network Server (LNS), which is the device
that terminates and possibly authenticates the PPP stream.
NAT (Network Address Translation) –
By the network address translation skill, we can transfer the internal network private address of DFL-1500
to the public address for the Internet usage. By this method, we can use a large amount of private
addresses in the enterprise.
POP3 (Post Office Protocol 3) –
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