Networks Flashcards
Define NIC
Network interface card - Any computer that is to be connected to a network, needs to have a network interface card (NIC).
Define hub
A hub is a device that connects a number of computers together to make a LAN.
How can the hub be used?
if it receives a message, it sends it to every computer on the network. This means that hub-based networks are not very secure - everyone can listen in to communications.
Define switch
A switch, like a hub, is a device that connects a number of computers together to make a LAN.
What is the difference between hub and switch?
A switch is a more ‘intelligent’ device than a hub: if it receives a message, it checks who it is addressed to, and only sends it to that specific computer
Define router
A router is a network device that connects together two or more networks.
Define proxy server
A proxy server is a computer setup to share a resource, usually an Internet connection.
Why proxy server is used more than router?
Proxy servers are often used instead of router since additional software can be easily installed on the computer such as anti-virus, web filtering etc.
Define bridge
A bridge is a network device that typically links together two different parts of a LAN.
Define firewall
A piece of software or device that is placed between your computer and the rest of the network - blocks unauthorized connections being made to your computer of LAN
Define intranets
A private networks that provides similar services to the Internet - only for private users
Give typical uses of intranet
- Viewing internal webpages(company calendars)
- Internal emails and instant messaging between workers
- Sharing of internal documents
Define ISP
Internet service provider
