IT Revision topic 2

IT Revision topic 2

1. Wireless Network Security

   • SSID
     • The public name broadcast by the wireless network.
   • Encryption
     • WEP WPA-PSK WPA2
       • WPA-PSK & WPA2 is the most secure.
     • To make networks secure an Encryption key is set in the router.

2. Protocols

   • HTTPS
     • A secure way to access a web page The ‘S’ means secure Used by banks etc Digital certificates obtained
   • VoLP
     • Uses internet protocols to communicate using sound/ video - IP telephony, - Skype
     • Cost saving as uses the internet or mobile data network
   • SMTP
     • Used to send emails
     • (Standard Message Transfer Protocol)

3. mobile phone connections

   • GSM
     • is a form of mobile phone connectivity and stands for Global Systems for mobile communications
   • -band
     • these prefixes indicate the frequency transmission available to the specific phone and the arrangement with the service provider and carrier.
     • Dual-band
     • Tri-band
     • Quad-band
   • GPRS (General Packet Radio Services )
     • is a packet-based wireless communication service that promises data rates from 56 up to 114 Kbps and continuous connection to the Internet for mobile phone and computer users.

4. Email protocols

   • POP3 (Old Method)
     • messages are transferred to the local computer and deleted from the mail server after downloaded by client (Pop & its gone)
     • Pros- Saves space on server
     • Cons – can only be read by one computer.
   • IMAP (Modern Method) (Internet Message Access Protocol)
     • Pros- Can be accessed anywhere with an internet connection
     • Messages are read on the mail server and not deleted
     • IMAP synchronises the emails (on all authenticated devices)

5. wired connection

   • Thunderbolt
     • Thunderbolt technology supports blazing-fast data transfer with two independent channels of 10 gigabits per second.
     • Thunderbolt and connect with thunderbolt equipped such as hard drives, displays/monitors,
   • Firewire
     • is used with digital audio/video, camcorders, home entertainment applications, central processing units (CPU) and personal computers (PC) and offers sustained transfer rates of over 3200 Mbits/s.
   • USB

6. WI-FI

   • connect to wifi
     • Router
     • WIFI adapter
   • Bandwidth
     • The amount of data that can fit through an Internet connection.
   • Latency
     • Latency measures the speed of the connection and is expressed in milliseconds. The lower the latency the higher the speed.
     • The time delay between the moment something is initiated and the moment it becomes detectable.