IB Comp Sci - Networks

NEED to use

LAN - Local Area Network

network of small # of computers in a close area

WAN - Wide Area Network

connects 2 or more LANs over (usually) a larger geographical area. WANS utilise telephone lines, satelite dishes, and radio waves to span a larger area (Example: the Internet)

VLAN - Virtual LAN

network of computers that act liek they’re connected to the same wire —> done through software

SAN - Storage Area Network

network of storage devices that can be accessed by many computers —> can access hard drives from server as if they were local disks

VPN - Virtual Private Network

network that uses public telecommunication infrastructure (i.e. the Internet) to provide secure access to an organisatiosn network

technology needed for VPN

1. Network Access Server (NAS) - might be a dedicated server or software. users need to use credentials to authenticate and establish a secure connection to the VPN.

2. Client software - software downloaded onto the devices of user/employee computers

PAN - Personal Area Network

interconnection of devices within range of a person (no longer than 10 metres), can be bluetooth devices connected to a phone

P2P - Peer to Peer Network

“peers“ are connected to each other using the Internet —> files can be shared w/o needing central server

protocol

a protocol is a set of rules/ a reference that ensures all programs are written in the same format. this ensures compatability

network protocol

standard set of rules used when computer communicate

data packet

data traveling over a network

data integrity

overall completion, accuracy, consistency of data. neccessary when data is travelling over a network

flow control

utilised to manage the flow of data between two devices/over a network. is a type of protocol

deadlock

situation in which two computers are waiting for the other to send the other a signal/message. neither computer ends up sending anything. protocols are used to handle these types of issues