Topic 3 Undersea Internet Cables

Topic 3 Undersea Internet Cables

1. Keywords and Definitions

   • Internet Service Provider (ISP)
     • You need an ISP to connect to the internet. ISP's have powerful computers called servers that are permanently connected to the internet.
   • Hotspot
     • A region where the internet can be accessed wirelessly.
   • WI-FI
     • A trademark for products that meets certain standards for transmitting data over wireless networks.
   • Router
     • A device that enables a network to be connect to the internet. Can be a wireless router.
   • Modem
     • Communication device that enables a link between the computer and cables and wires.
   • Network
     • Most computers are connected to a network, which usually involves the Internet. A network is as basic as two computers being connected together.
   • Dial up modem
     • Connecting to the Internet with an old fashioned modem and then being connected to a telephone socket. Very slow.
   • Bluetooth
     • Is a wireless technology that allows Personal Digital Assistants (PDA’s) such as smart phones, laptops to share information.
   • Broadband
     • Is networks which can carry multiple channels of data.

2. Advantages and Disadvantages

   • Dial up modem
     • A: It can be used in areas where broadband is unavailable. You can dial up from different locations.
     • D: Slow transfer speeds, difficult to upload/ download files. Example watching a video online.
   • Broadband
     • A: Download a lot of data quickly. Possible to use phone and Internet at same time.
     • D: As more people use broadband in an area, download/ upload time increases. Greater risk of hacking.
   • Bluetooth
     • A: Can share information such as music etc. No wires are needed and connect with several devices.
     • D: Can only be used over short distances and can only share information if the other person has Bluetooth. Potential health concerns.

3. Examples

   • ISP: TalkTalk, Orange, AOL.
   • Geographical Information System: Satellite navigation systems, Google earth, the AA, multi map etc.

4. Exam Questions and Answers

   • Identify 2 advantages in using wireless network rather than a wired one.(2 marks)
     • Fewer trailing wires to trip over.
     • Easier to keep offices clean.
   • A company has wireless network installed. Describe one reason why they might be concerned about the security of their data. (1 mark)
     • Hacker may gain access to the network and steal data.