network technologies - chapter six Flashcards
what is a network ?
A computer network is a set of computers sharing resources located on or provided by network nodes. The computers use common communication protocols over digital interconnections to communicate with each other.
What is a url
Uniform resource locator , a websites unique adress.
What is HTML
Hyper text markup language , a language used to define the structure of a webpage
What’s HTTP
Hypertext transfer protocol , a communications protocol that allows websites to be accessed using the internet
The iot
Internet of things describes the impact of the internet on how we live and work
Wifi
A wireless medium that allows devices to connect and communicate using radio waves
Router
A hardware device that connects a number of networks together by either cable or wireless , to allow for data transmission.
Bluetooth
A short range wireless technology that connects to devices with the purpose of communications
Optical fibre
Technology that used very thin glass strands to send data and very fast transmission speeds
Network interface card NIC
An electronic board fitted to a computer to allow it to be connected to a network
File server
A powerful computer on a network the main purpose of which is to store users files
Switch
A hardware device that allowed a computer to connect to ur using a cable to access a network.
Router
Hardware device that connects a number of networks together
Bus network
All computers are connected to the main cable “backbone”
Data can travel in both directions along the backbone
To add a new computer to a bus network it’s cable is attached to the backbone
Star network
Computers are connected by their own cable to a file server
All data on the network must pass through the file server
An additional computer can be added by attaching it to the file server
Ring network
Each computer is directly connected to two other adjacent computers to form a ring
All data travels in one direction by visiting each computer in turn until it reaches its destination
To add a new computer the cable between two existing computers must be broken and each past of the broken cable attached to the new computer
Virus
A program that is designed to damage a computer system
Advantages of networking
Users can save their work on the file server and retrieve it on another computer
Expensive hardware devices can be shared
Installing software updates onto the filter server allows all computers to access them
Disadvantages of networking
Virus can quickly spread across the network
When a large number of users are logged in the speeds can be slow
The set of costs can be expensive
Www
The worldwide web is an application that uses the internet
The internet
An example of a wan
The intranet
Similar to the internet but Managed my an organisation
