Comp Sci

LAN: computer network that connects multiple computer system that are in the same geographical place

VLAN: used to partition initial LAN into logical separate networks

SAN: networks used to access large storage devices from servers easily

WLAN: links 2 or more computers systems in a limited geographical area

VPN: computer network that connects multiple computer systems

PAN: networks that interconnects devices that are centered around an individual person’s workspace

P2P: network that uses a distributed networks architecture in which all computer systems are decentrelized, and are both clients and servers

Protocols: international rules that ensure the transfer of data between systems. 

OSI seven layer model:

  1. Application - provides and performs services for the applications used by end users
  2. Presentation - provides data format information, data compression information and data encryption information to the application
  3. Session - manages sessions between 2 users
  4. Transport - hosts, and definition of data segments
  5. Network - handles routing of packets across a network through intermediary devices (example: IP)
  6. Data link: error handling of physical transmission, while also building frames and flow control
  7. Physical - transmits 0s and 1s over media between devices

Data packet: portion of a message that is transmitted through a network; contains data such as check digits and destination address.

Compression of Data: 2 types - lossy data compression and lossless data compression. Reduces size of files to be transmitted over a network

Packet Switching: a communication method used in computer networks in which data are grouped into packets.

Wi-Fi: networking technology that uses radio waves to provide access to internet (which is wireless)

WiMax: 4G network originally designed as an alternative to DSL Cable and T1 lines

3G: third generation of mobile networking and telecommunications technology.

MAC: a media access control address. It is a 12-digit hexadecimal number assigned to each device connected to the network.

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