Connectivity

Allows users to share an internet connection

Local Area Network (LAN)

- Shares internet

- Shares and backs up files

- Shares peripherals (Printers)

- Internet telephone services 

Router: Connects all computers to a modem and gives an internal IP address

You need a Network Interface Card (NIC) to connect computers to a network

- Change the default admin password

- Set up a form of Encryption

- Set up MAC address filtering

- Stop the router broadcasting itself (its SSID)

- Turn off the router when not in use

- Reduce transmitting power

Bandwidth: The numbers of bits that can go through the network conection in 1 second. (High Bandwidth is good)

Latency: The time in milliseconds between a bit leaving one device and arriving at another. (Low Latency is good)

Wifi

- Good range

- High Speed (54 Mbps)

- Widely available

- Hackers can set up fake WiFi hotspots

- Cant use if in not range of an access point

Mobile Broadband

- Greater Coverage than WiFi

- More secure - data is encrypted

- Have to pay for broadband and roaming charges

- Downloads limited

- Lower bandwidth than WiFi

WiFi Direct

- Allows users to set up peer-to-peer networks with a Wireless Access Point

- Allows devices to use an access point for normal WiFi use

Bluetooth

- Allows devices to communicate automatically when in range

- Can connect up to 8 devices at once

- Low power so doesn't interfere with other devices

- Lower Bandwidth and Range than WiFi direct

VoIP: Voice Over Internet Porocol

POP3, IMAP, and SMTP are used when sending or recieving emails

POP3: Post Office Protocol, email is downloaded to computer and deleted from server and can be read offline

IMAP: Internet Message Access Protocol, Email is read on the server and is not deleted from the server so can be read anywhere using the internet

SMTP: Simple Mail Transfer Protocol, used when the email is sent from the email client (Outlook), to the senders email server and when the email is delievered to the recipients server.

Prevent remote access using a firewall. 
Firewalls: software which permits or blocks connections between computers according to rules you have set.

Some Malware works by shutting down the fairwall.

Precautions:

- Install AntiVirus

- Run regular scans

- Only download from trusted websites

- Only open email attachments from recognised senders

- Use Encryption

Stop illegal access by setting up a username and password on your network

- Lock computer

- Chains and Locks

- RFID chips

- Instal Burgular Alarms

- CCTV

- Require people entering building to authenticate identity

- Issue Swipe Cards

- Fit Blinds

- Use Biometrics

- Fits doors with security keypads