Network


 * Network [[image:networking.JPG align="right"]]**

LAN(Local Area Network) - A collection of computers connected with network devices.

WAN(Wide Area Network) - network that spans a geographic distance larger than a LAN.

DNS (Domain Name System) - an internet service that tranlates domain names into IP address.

Domain - a group of computer and devices on a network that are administered as a unit.

TCP- enables two host to establish a connection and exchange data reliably. Connection oriented

UDP- does not perform any handshakes processes.

IP- a routable protocol whose job is to make the best effort at delivery.

IP Address- an address given to a host on a network or internet. Example: 192,168.1.91.

HTTP(Hypertext Transfer Protocol) - a TCP service that operates on port 80 and is one of the most well known application.

NIC(Network Interface Card- a hardware device inside a computer or other network device that enables communication with a network.

Packet- Unit of data sent across a network. Data is broken up into packets for sending over a packet switching network.

Ipconfig - a command line command that provides users with ip configuartion.

ping command - a command line command used to check network connection.

SSL(Secure Socket Layer) - operates on port 443 and is a secure protocol used to connect to an untrusted networks.

PGP(Pretty Good Privacy) - developped in 1991 as a free email security application.

TCP/IP - foundation of the internet.

Telnet- is a TCP service that operates on port 23. Allows a a client at one site establish a remote session.

FTP(File Transfer Protocol) - application that enables file transfer from one computer to another.

Router - specialized network device that determines the next network point to which it can foward a data packet towards the destination of the packet.

Proxy - computer network service which allows clients to make indirect netwok connections to other network services

Firewall - piece of hardware or software put on the network to prevent some communications forbidden by the network policy

Network Address Translator - Network service provide as hardware or software that converts internal to external network addresses

Modem - device that modulates an analog carrier to encode digital information and that also demodulates such a carrier signal to decode the transmitted information