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42 - Internet and online security

internet as the connection speed is low and connection time is

typically charged per hour.

DSL (e.g. ADSL)

DSL (Digital Subscriber Line) is an 'always-on' connection that runs

over the phone line. As DSL and phone do not use the same

frequencies, you can use your telephone at the same time you are

connected to the internet (this requires a 'micro-filter' on each

telephone socket to avoid interference). To be eligible for DSL, you

must be located near an DSL-equipped phone exchange (service is

sometimes unavailable in rural areas). Connection speeds vary

depending on your location, but DSL generally provides very fast and

reliable internet connection. As the connection is always-on, it is

generally charged at fixed monthly rates.

Note

A DSL connection requires an appropriate modem. A modem is usually

provided by the ISP when you register. Many of these modems include an

'router' that provides network and Wi-Fi access.

Cable

A cable connection provides fast and always-on internet service via a

cable television line. This service is generally available in large cities.

You can use your telephone and watch cable TV at the same time you

are connected to the internet.

Network connections

A LAN (Local Area Network) is a group of computers (for example,

within an office building or home) that share a common

communications line and resources. When you set up a network, you

can share files, peripheral devices (such as a printer) and an internet

connection. You can set up a LAN using wired technologies (such as

Ethernet) or wireless technologies (such as Wi-Fi or Bluetooth).

Wireless networks

A wireless LAN or WLAN is a wireless local area network, which may

link two or more computers without using wires. Setting up a wireless