Chapter 15

DNS

(Domain Name System) The service that maps names to IP addresses on most TCP/IP networks, including the Internet.

packet

A small unit of data transmitted over a network.

AES

Advances Encryption Standard - An encryption standard used by WPA2 and is currently the strongest encryption standard used by Wi-Fi.

loopback address

An IP address that indicates your own computer and is used to test TCP/IP configuration on the computer.

DMZ

Demilitarized Zone - refers to removing firewall protection from a computer or network within an organization of protected computers and networks.

multicast address

In TCP/IP version 6, an IP address used when packets are delivered to all nodes on a network.

unicast addressing

Using TCP/IP version 6, an IP address assigned to a single node on a network.

router

A device on a network that sends data via the most efficient route to travel to a specific location.

subnet

A group of local networks when several networks are tied together in a subsystem of the larger intranet. In TCP/IP Version 6, one of more links that have the same 64 bits in the first part of the IP address (called the prefix).

Hostname

A name that identifies a computer, printer, or other device on a network, which can be used instead of the computer's IP address to address the computer on the network.

local area network

A network bound by routers or other gateway devices.

Channel

A specific radio frequency within a broader frequency.

port forwarding

A technique that allows a computer on the Internet to reach a computer on a private network using a certain port when the private network is protected by a firewall device using NAT. Port forwarding is Also called tunneling.

gateway

Any device or computer that network traffic can use to leave one network and go to a different network.

intranet

Any private network that uses TCP/IP protocols. A large enterprise might support an intranet that is made up of several local networks.

DHCP

Dynamic Host Configuration Protocol - A protocol used by a server to assign a dynamic IP address to a computer when it first attempts to initiate a connection to the network and requests an IP address.

FTP

File Transfer Protocol - A TCP/IP protocol and application that uses the Internet to transfer files between two computers.

octet

In TCP/IP version 4, each of the four numbers that are separated by periods and make up a 32-bit IP address. One octet is 8 bits.

Link

In TCP/IP version 6, a local area network or wide area network bounded by routers.

neighbors

In TCP/IP version 6, two or more nodes on the same link.

radio frequency

The frequency of waves generated by a radio signal, which are electromagnetic frequencies above audio and below light

name resolution

The process of associating a character-based computer name to an IP address.

port filtering

To open or close certain ports so they can or cannot be used. A firewall uses port filtering to protect a network from unwanted communication.

anycast address

Using TCP/IP version 6, a type of IP address used by routers and identifies multiple destinations. Packets are delivered to the closest destination.