Information Technology

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1. Describe the difference between an analog signal and a digital signal? Analog signal has a smooth consistency over a vary of time. An example of analog signal is voice. Digital signal is smooth, but after a period of time, it will change its consistency. An example of digital signal is text. 2. What is the function of a dial up modem?

A dial up modem, modulates the digital data received from a computer, and transfers it into an analog signal, which then transmits down a telephone line. The receiving dial up modem, demodulates the analog signal, turning it back into a digital signal. 3. What is a network? How is a local area network (LAN) different from a wide area network (WAN) A network is a collection of computers ad devices connected by communication channels, that allows users to share resources with each other. LAN, is restricted to a network devices and computers connected together in a building.A WAN contains several LANs, not restricting to one building, rather than being connected within a state/country. 4. Describe the five main advantages of using a network over standalone computers? Resource sharing; Able to share resources such as a printer. Load reduction; Being able to share data, dividing work over a network, rather than on one computer. Data Sharing; Being able to share data across the network.

Cost Reduction; Sending data via the network, rather than using a compact disc. Communication; Easier communication over the network.
5. Why user dependence is considered a possible disadvantage of networks? The users of the network rely on the network to operate correctly, if a file server develops a fault, the users of the network would be unable to use it. 6. What problem could eventuate if a network is not well managed? The network may run less efficiently.

7. Describe four important tasks of a network operating system? File management
Printer management
8. Identify the network operating system in your school.
Microsoft XP
9. How does a peer to peer network differ from a client server network? A peer to peer network is a simple, inexpensive network that typically connects fewer than ten computers. In a client server network a server, sometimes called the host computer controls access to the hardware and software on the network. 10. Identify the dedicated servers that are used on networks in your school? File server

Print server
A database server
11. Briefly describe two common network topologies.
Commonly used network topologies are bus and star. Networks usually use combinations of these topologies which are referred to as hybrids. 12. What is an intranet? What benefits to organisations are there in setting up an intranet? An intranet is an internal network within an organisation that uses internet and web technologies. It allows restricted access to company information. Facilitates communication. Accessing the intranet is usually fast. 13. Why do manufacturers of networks hardware and software follow established standards? Standards are important in the computer industry because they allow the combination of products from different manufacturers to create a customised system. 14. Briefly describe how an Ethernet network transmits data. Ethernet networks use cables to transmit data

15. In what situations would the TCP/IP protocol be most useful? It would be most useful when developing an intranet.
16. Explain the term packet switching.

Breaking a message into individual packets, sending the packets along the best route available, and then reassembling the data is called packet switching. 17. What network transmission standard would be useful in a situation where an old heritage listed building with solid stone walls need to be networked? 802.11 standard wireless network

18. What advantage are there for users if a network moves from the 802.11b standard to 802.11n? Faster speed and stronger signal strength....
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