Flashcards
ICT Topic 2 : connectivity
Cards in this deck (15)
- 1Home NetworkBENEFITS:
- sharing the internet connection
- Sharing files, including backing up files
- Sharing peripherals, for example printers
DISADVANTAGES:
routers are needed to connect the internet to a home network - 2LANLocal area network
- 3Network security- Change the default password on your router to stop people from accessing it.
- 4EncryptionScrambling data
- 5Combining TechnologyMobile phones and laptops, for example, are compatible because they can communicate via Wi-Fi or Bluetooth
Technology and they both have USB ports. - 6BandwithThe number of bits that can go through the network connection in one second (measured in bits per second, bps).
- 7LatencyThe time in milliseconds between a bit leaving one device and arriving at the other. It is measured in milliseconds (ms).
- 8bandwidth --> latencyhigher bandwidth usually means higher latency
- 9Wi-Fi- Wi-Fi devices need to be within range of a wireless access point (‘hotspot’).
- This connection is good because it has a good range (60 metres from the hotspot) and is quite widely available.
- This connection is not so good because, sometimes, hackers can set up fake hotspots putting users at risk. - 10Mobile broadband- 3G and 4G can be used which have greater coverage than Wi-Fi.
- 3G is more secure than Wi-Fi because data is encrypted.
- 3G costs money though and downloads are limited. - 11ProtocolsProtocols are rules that devices follow when they communicate with each other.
- 12Communication protocols-VoIP is the set of rules for transmitting audio messages over the Internet. These help people make free voice calls or, combined with a webcam, video calls.
- POP3, IMAP, SMTP – these are the rules used when sending emails.
- HTTP – this is the protocol of the World Wide Web (WWW). HTTPS is secure - 13Security risks part 1When you connect to the Internet, your computer is visible to billions of computers around the world.
To protect yourself, use a firewall. This is software that permits or blocks connections. - 14security risks part 2Data can also be stolen through unauthorised access. People should set secure passwords consisting of numbers, punctuation and upper and lower case letters.
- 15security risks part 3-People should also lock their computer when they leave it unattended.
-To prevent physical theft of the computer, chains and locks should be used to further protect data that is saved on the machine itself.