Networking security is used to protect a series of computers connected to a specific network by scrambling the data passed between the network. This renders the data useless outside the network and secure.
A network diagram and a spreadsheet of IP addresses are the two most useful tools.
Topology is always useful when looking at how a network is physically constructed or wired. This gives the network technician some idea of how the network is put together when diagnosing problems.
Spread sheets, network diagrams
Phone Network is useful because it has the ability of quick access and low cost makes phone network useful in ms access. Phone network is a secured and reliable network among all networks. So it is more easy to use and most of the people want quick access on net. Phone network gives them that ability to do so. It is also suitable for long range communication.
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A computer network - is two or more computers linked together. It's useful - because computers can communicate 'live' with each other. Additionally - If computers are networked, you only need one printer. All the computers on the network 'share' the printer between them.
If a network is to be at all useful, it cannot be totally secure.Some security companies make a fortune pretending that they can make your network secure.
The OSI model is useful in network design and assessment because it makes network communications more manageable by dividing the processes up into smaller parts. The processes are broken up into 7 layers and each layer serves the one above it.
In the current economy the job market is very competitive. Any and all education you have is useful and may give you a leg up over the competition. http://www.networkplusnotes.com/network-plus-certification-exam.htm
You can get a network certification online at a place like this: http://www.gatlineducation.com/networkcertification.html . As for jobs, this certification is useful for getting jobs as a network technician or systems administrator.
You can find out more about wireless network on the following website: http://www.howstuffworks.com/wireless-network.htm. They have useful info.
Logic probe(not sure)