Wide Area Networks
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What are some examples of devices that require WiFi?
Laptops, some desktops, tablets, smartphones, many IoT devices.
What are some examples of devices that require bluetooth?
Wireless headphones, connecting phones to car entertainment systems and keyboard
How far can Wifi cover?
5 Meters.
How far can Bluetooth travel?
10 Meters
How far can LoRA travel?
40 Kilometers.
What is bluetooth?
Wireless method of connecting devices over a short distance.
What type of waves and speed does bluetooth use?
Radio Waves - 2.4Ghz
What does pairing devices mean?
Persistent link is made between two devices.
How might devices be paired?
A device can ask for a passkey in order to pair to it – this gives a layer of security like a password. Passkeys only need to be entered once and will be remembered by devices that are paired. When a paired device is close enough to communicate it will say that it is connected.
What waves are used for wireless transmission?
Radio Waves for communication.
What might limit performance of wireless transmission?
Interference from objects and nearby electronic or radio devices.
What are NIC’S?
They are cards built into every networked device capable of connecting to a wireless network.
What is a Wireless Access Point?
Device that allows wireless devices to connect to a wired network using WiFI.
How does the AP connect to the router?
Via a wired network.
What do home routers usually combine in one box?
Functions of switch, router and wireless access point.
How do you prevent someone who intercepts your data from reading it?
Encryption.
What is Plaintext?
Original message to be encrypted.
What is Ciphertext?
The encrypted message.
What is encryption?
The process of converting plaintext into cipher text.
What is a key (Encryption)?
Sequeunce of numbers often used to encrypt or decrypt, often data using a mathematical formula.
What is an encryption algorithm?
Formula for encrypting the plaintext.
What is Caeser Cypher an example of?
Symmetric encryption (uses same key to encrypt and decrypt a message).
What are the two keys used in encryption?
Public and Private key.
What is the private key?
The private key is never transmitted so it is incredibly hard to decode.