1.3 Wired and Wireless Networks Flashcards
What is WiFi?
WiFi is a technology that enables wireless connectivity to all sort of devices.
What signals does WiFi use for data transmission?
Radio signals
What frequency bands does WiFi use?
WiFi uses the frequency of 2.4 GHz and 5 GHz.
Why is it important to have a limited number of overlapping channels in a waveband?
Because overlapping channels may cause interference and lead to data corruption.
What is the range of WiFi signals?
The range of WiFi is up to 20 metres. This range varies according to the nature and thickness of walls that signals pass through.
Why is it important to secure data in WiFi networks?
Because any device with WiFi capability will be able to receive data packets in range of 20 m.
How is data security ensured in wireless networks?
By using encryption algorithms
What is Caesar cipher?
Caesar cipher is a basic encryption algorithm where the alphabet is displaced by a known amount.
Why is Caesar cipher not secure enough for wireless networks?
Because it can be easily cracked by unintended users.
What is a public key?
Keys that are available to all users and are used to encrypt messages.
What is a private key?
Keys that are only available to the intended recipient and are used to decrypt messages.
Where can a sender find public keys?
Senders can find public keys in a directory.
What is a hashing algorithm?
A hashing algorithm converts a text message into a string of hexadecimal characters.
What is an MD4 algorithm?
A hashing algorithm that generates 128-bit string is generated for any message.
