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Twitter
An attack on Twitter which prevented users from "tweeting" on Thursday could have been the work of a teenager in their bedroom, an expert has said.
The micro-blogging site went down for several hours in the afternoon after falling victim to a "denial of service" attack.
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What Is One Of Those?

What is a Router?
A router is a device that is an intermediary between a computer and the Internet, which determines where data is sent.  A number of computers can be configured to share a router and hardware firewalls are often incorporated as standard.  Routers can also be known as gateways.

What is VoIP?

Voice Over Internet Protocol (VoIP)
This is a new technology that enables broadband users to send voice calls via the Internet.  There are now a number of these services in operation and calls can be made free of charge.

What is a Firewall?

Firewall
A system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are used to prevent unauthorized Internet users from accessing private networks connected to the Internet.