Routers

A router translates information from one network to another; it is similar to a super intelligent bridge. Routers select the best path to route a message, based on the destination address and origin. The router can direct traffic to prevent head-on collisions, and is smart enough to know when to direct traffic along back roads and shortcuts.

While bridges know the addresses of all computers on each side of the network, routers know the addresses of computers, bridges, and other routers on the network. Routers can even "listen" to the entire network to determine which sections are busiest -- they can then redirect data around those sections until they clear up.

If you have a school LAN that you want to connect to the Internet, you will need to purchase a router. In this case, the router serves as the translator between the information on your LAN and the Internet. It also determines the best route to send the data over the Internet. Routers can:

* Direct signal traffic efficiently
* Route messages between any two protocols
* Route messages between linear bus, star, and star-wired ring topologies
* Route messages across fiber optic, coaxial, and twisted-pair cabling

Mobile phone security

Make a note of:

* Your mobile's serial number (also known as the IMEI number)
* Your mobile phone number
* The number of your operator's customer services (including UK dialing code).

Keep them with you in a safe place, separate from your mobile.

If your phone is stolen you will be able to contact the network operator in the UK and request that they block your phone and/or SIM card. You may need to provide additional information in order to get the phone blocked, such as a password. Contact your operator for details of how they deal with stolen phones before you leave so you can be sure you have the right information abroad to block the phone if it is stolen.

Information - GPRS

General Packet Radio Service (GPRS) enabled networks offer 'always-on' higher capacity, internet-based content and packet-based services. This enables services such as color internet browsing, e-mail on the move, powerful visual communications, multimedia messages and location-based services.