Topic 2 - Connectivity

Topic 2 - Connectivity

1. HOME NETWORK

   • such as a modem or router
     • Router - send data to where you want to go
     • Modem - convert signal so that the computer can use it
   • WAN
     • Wide Area Network is type of computer network to connect offices which are located in different geographical locations.
   • LAN
     • Local Area Network is a private computer network that connects computers in small physical areas.

2. BANDWIDTH

   • the amount of data that can be transmitted in a fixed amount of time
     • better=higher

3. LATENCY

   • amount of time a message takes to transverse a system
     • better=low

4. PHYSICAL RISKS OF DATA

   • damage, theft of equipment, scratches on the hard disk
   • how to keep safe from risks
     • use swipe cards, lock when not in use, keep windows shut, CCTV, make sure nobody can see your keyword

5. WIFI

   • good range is about 60m away from the router
   • speed can be up to 54mbps
   • choose your Wi-Fi network and put password in if needed
     • If other people connect to your Wi-Fi they can hack into your network and get onto your personal documents. This can be stopped by having a password on it.

6. SECURITY RISKS IN A NETWORK

   • Firewall
     • protect a system from unauthorised acces
   • Virus
     • malicious software that reproduces itself and can infect other computers
   • Passwords
     • make it a hard password that no one can guess
       • no birthdays or first names
       • use symbols, lower and upper case letters

7. MOBILE BROADBAND

   • you can connect using a dongle or 3G
   • better coverage than Wi-Fi as there are more pylons where as wifi is reliant on small hotspots
   • can use areas in and out of the hous

8. COMMUNICATION PROTOCOLS

   • VOIP
     • Voice Over Internet Protocol is the transmission of voice and multimedia content over Internet Protocol (IP) networks.
   • POP
     • Post Office Protocol is a type of computer networking that extracts and receives email from a remote mail server to access by the host machine.
   • IMAP
     • Internet Message Access Protocol is a standard email protocol that stores email messages on a mail server, but allows the end user to view and manipulate the messages as though they were stored locally on the end user's computing device(s).
   • SMTP
     • Simple Mail Transfer Protocol is a TCP/IP protocol used in sending and receiving e-mail. In other words, users typically use a program that uses SMTP for sending e-mail and either POP3 or IMAP for receiving e-mail.
   • HTTP
     • Hypertext Transfer Protocol is the set of rules for transferring files (text, graphic images, sound, video, and other multimedia files) on the World Wide Web.
   • HTTPS
     • (HTTP over SSL or HTTP secure) is the use of Secure Socket Layer (SSL) or Transport Layer Security (TLS) as a sublayer under regular HTTP application layering. HTTPS encrypts and decrypts user page requests as well as the pages that are returned by the Web server.