Module 5.6.4

Common Network Environments, Connectivity and Security Issues

Discuss the demands of a nomadic network environment such as mobile phones;

Nomadic Network Environments Definition

• Network that is not static but allows the devices connected to it to roam

Characteristics• Device:

» Something portable and small – needs to be carried around Portable computer (palmtop, laptop, etc)

• Means of mobile communication» Method of connecting the device to the network

Telephone (in some cases the means of connection and the device may be the same)

• Secure transmission» Encryption needed to ensure security of the transmission

Implications of Nomadic Networks Location

• Can be anywhere in the world• Increases freedom• To make these networks useable, access points must be available

at various points so the nodes can pick up the signal from the network. 

• Cell (mobile) phone networks and wireless LANs have access points so users can connect even when they are on the move. 

• If you move out of the range of an access point, the network is no longer available.

Transmission• Need to increase security• Traffic in the airwaves increases – must be a theoretical limit

Satellites• Cancer scares about masts at present – increase in number of

masts• Require more satellites

This includes devices like laptops with wireless LAN technology mobile phones wearable computers

• Wearable computers are usually either integrated into the user's clothing or can be attached to the body through some other means, like a wristband. They may also be integrated into everyday objects that are constantly worn on the body, like a wrist watch or a hands-free cell phone.

personal digital assistants (PDAs)• A basic PDA usually includes date book, address book, task list,

memo pad, clock, and calculator software. Newer PDAs also have both color screens and audio capabilities, enabling them to be used as mobile phones, web browsers or media players. Many PDAs can access the Internet, intranets or extranets.