Networking

Has one cable that connects every device on the network called the backbone At each end theres a small device called a terminator, absorbs signals when they reach the end to prevent interference Each device connected to main cable

If 2 or more devices try to sent data at the same time, causing signals to interfere If collision occurs, devices must wait a random amount of time before trying again

Weak ass unless data is encrypted, every device attached to the bus can read every message sent to their device

If the main cable fails, the whole network will stop. If theres is a failure in a cable that connects a single device, it will affect only this device

Physical topology: - depicts physical layout - physical connection of network - actual route of transmission Logical topology: - logistics of network of data transmission - data path followed of the network - high level representation of data flow

Each device is connected to central communication device (hub or switch)

High as messages are transmitted on a specific path (source to destination)

If the switch or hub fails, no connected device will be able to communicate If an individual cable fails only that device will be affected and the rest of the network can continue to operateb

One or more central servers that provide services to clients of the network

A network where there are no central servers, but rather the devices on the network provide the services themselves

• servers can be located in secure rooms • management of network can be done from one location to another • files can be ordered easily • more powerful machines that their clients

• cheap to setup as no specialist equipment required • easier to setup and maintain than client-server

An improvement on WPA as it provides an even stronger encryption algorithm

provides an even stronger encryption algorithm by encrypting each message several times depending on the key size

A string of alphanumeric characters that’s specified during the setup of wireless devices

You can hide them from being broadcasted, so to join the network you would need to know the exact SSID and enter it

A wireless local area network, based around central communication devices called wireless access points

A specific range of radio wave frequencies Most common are 2.4GHz and 5GHz

General industrial use

They are smaller bands within the frequencies A network will be configured to operate on a specific channel

• Assemble a new frame • Check if channel is idle • If it is empty the data is transmitted • If not then the device will wait a random period of time

It cannot overcome hidden nodes as it cannot see some parts of a network where communication may be occurring

• Assemble a new frame • Check if channel is idle • If idle, send a RTS message • If CTS message is received, transmit data