BTEC level 5 RQF - Class C

Access Method - rules of how data go in and how data go outside the cable. Two types of access data CSMA (carrier- sense" listening" Multiple access" multiple devices") and Token Ring . CSMA (carrier- sense" listening" Multiple access" multiple devices") two types: 1. CSMA/CD CD stands for Collision Detection Each computer on the network including the clients and servers, check the cable for network traffic. (listen - transfer - submit) data is sent on at a time if data is sent by 2 or more computer at a time, a collision will happen, in which no message will be sent 2. CSMA/AC collision Avoidance. Queuing to avoid a collision. example of queuing real life (queuing for a blood test, where the patient wait for their turn ) Token passing found in a ring topology. one token will go round and round (always) from one node to another. if a user wants to send a message, wait for the token pass then the user catches the token,

Network Topology - arrangement of internet where device supposed to be two type of network topology: 1. Logical - how device appear to be connected to each other example; packet tracer. 2. Physical- actual interconnection with wire and cables(actual connected). point-to-point:  two device directly connected together figure 1(point to point topologies) example; can be PC and PC, PC to switch + sending information is faster + no traffic - cannot connect more device - the cable broke will affect the others. BUS use (1 backbone) 1 cable connected to several devices (it can be PC, Printer, laptop)   figure 2(BUS topology) +not expensive because only use one cable +easy to install another device -if one PC is broke it will affect others, because of using 1 cable. -there will be traffic if many hosts want to send information at the same time. STAR it uses a switch, hub or a router in the middle to connect to any device                          

The figures below show the LAN connection in Lab1, which include 26 Personal Computer, 2 switch, a printer and a router. Using Sisco Packet Tracer.

LAN - Local Area Network DESCRIPTION: is a restricted network of a building or site. It’s a private network belong to manager or business HOW IS IT WORK :  the network can be use to communicate with each other using LAN. EXAMPLES :  Ethernet, building of a college, office, WiFi MAN-   Metropolitan Area Network DESCRIPTION:  convert 2 or more LAN in large area of city or places, MAN is in between LAN and WAN HOW IS IT WORK  :  to connect with some LAN through backbone EXAMPLES :   DST, Telbru WAN- Wide Area Network DESCRIPTION:  develop over large area by joining LAN together HOW IS IT WORK  : connect by using virtual private network (VPN) which provide protection and allow to transfer data over the internet EXAMPLES : telephone companies, satellite system PAN- P ersonal Area Network DESCRIPTION:  (Bluetooth) connect device that are nearby or close to one person HOW IS IT WORK  :  it transfer and ex