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chapter 13 (13.1: ((A network is 2 or more computers, and often other…
chapter 13
13.1:
A network is 2 or more computers, and often other devices (like printers, external hard drives and so on), that are linked together so they can share hardware and transfer data to each other.
3 examples of people using networks in everyday life is: online gaming, using a printer, and talking on Facebook.
In a large organization, a network administrator is responsible for keeping the network running efficiently and securely
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Being able to share printers, faxes and scanners among network users reduces the amount of devices needed. And saves money on space
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A single connection to the internet provides many things including email, web and file access services to all network users.
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A careless user can bring a virus into the network, causing major damage to the computer software
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The biggest threats to the security of a network are viruses and hackers. But they can also come from inside the firewall in the form of workers accidentally causing careless or malicious incidents. It also can be in the form of mechanical breakdowns, thefts and fires
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The way that cellphones connect to the internet is that they have in built antennas in them, which they use to send and retrieve packets of digital information via cellphone towers using radio waves
13.2:
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Protocols are important because they are the transportation devices of the internet, they are the ones responsible for transportation of data.
Open protocols are protocols used for data transportation throughout a very wide area of connection.
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Each computer must have an IP address so that the data downloaded from the internet can be delivered to the correct place.
Data packets are documents that are cut up into pieces making it easier to transfer the document from one place to another.
You need different protocols because if you have one protocol it will make the network system extremely slow.
13,5
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UTP cables have 4 pairs of wires. Each pair of wires twist around each other to reduce interference with the signal on the wire. The wires are color coded so that it's easier to assemble the rj45 connectors.
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The main advantage of UTP cables is that it has the optimum balance of speed, cost, reliability, security. The disadvantage is that if a company moves to a different building the wiring has to be left behind and it is expensive to make major changes to the wiring.
The way that data moves back and forth from optical fibers is that it moves packets of data in the form of light pulses. The core of an optical fiber cable carries the light pulses and the cladding reflects the light pulses back into the core.
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