Computer Concepts

Computing

Quiz 5 :

Local Area Networks

Quiz 5 :

Local Area Networks

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Explain the difference between an analog signal and a digital signal. Explain why most modern communications systems use digital signals.
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img img img img img img img img img img img img img img

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List five characteristics of Ethernet that make it a popular network standard.
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Characteristics of Ethernet:
1. Easy to use; without minimum knowledge of networking, Ethernet can be used.
2. It is fast; it transmits information nearly 10Mbps in network.
3. It is easily available; there are many vendors who have supplies for Ethernet installation.
4. It can be easily convertible from small network to a large network and vise-verse.
5. It adopted the Ethernet standards IEEE 802.3 currently.
6. It is compatible with WI-FI equipment. By this a network can be more flexible.
7. Equipment can be used for wired as well as wireless technology of establishing a network.

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List five advantages and three disadvantages of computer networks.
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Computer Network
A network is a collection or group of two or more computer which exchange data with each other. Two or more computer is connected in network through wired media like co-axil cable or through wireless media like Wi-Fi.
Advantages of computer network:
1. Speed : When a user transfer a file through a network, then it is a very rapid process and also saves time instead of sending files through other mode of transport like through car or airplane.
2. Improve communication: Computer Network also improves the communication between people. With the help of computer network a person can easily communicate with his friend or relative which lives in the other country by sitting at home.
3. Resource sharing :- By computer network, resources like modems, printers, files, fax machines can be easily shared because all the computers are interconnected to each other.
4. Flexible access : Computer network provides flexibility of accessing the files from anywhere by simply logging to the computer. The network administrator can also restrict users by setting specific permissions of handling files.
5. Cost : A computer network provide resource sharing facility hence cost of hardware is minimized. It also minimized the storage expanses.
Disadvantages of computer network:
1. Security: One of the main disadvantages of computer network is security issues related with the network. A single computer which is not connected with in the network does not have security issue because not can steal the information by remote access. When computer is connected in network then hacker tries to steal the information from remote by using spywares.
2. Cost of implementation: The cost of implementing a network depends on the number of workstation connecting in network. If large number of workstation connecting in network then network setup and maintenance cost is very high.
3. Depend on server: The performance of computer network depends on the efficiency of server. If server computer is not so powerful then overall efficacy of network degrades.

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You've set up a network using some new equipment and a few old Wi-Fi adapters given to you by your roommates. One of the adapters is equipped only for WEP, whereas all the other adapters support WPA2. Your roommate tells you that in order to use all the adapters, you'll have to disable wireless encryption. Is your roommate right? img
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Explain the difference between packet switching and circuit switching. Describe the differences between IP addresses and MAC addresses.
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List the technologies that carry wireless signals and give an example of where each is commonly used.
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You have a small network in your house that uses a wireless router. For the past week, you've seen a black SUV parked outside and its occupant seems to be using a notebook computer. The first step you should take to discover if this person has hacked into your network is: a) knock on the car window and ask; b) call the police; or c) use your router utilities to check who is connected to your network. img
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Draw a diagram of Shannon's communications model and explain how it relates to communications protocols. Apply Shannon's model to a Wi-Fi LAN by indicating which real-world devices would exist at various points in the model to originate data, encode it, transmit signals, and so on.
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List four kinds of wireless encryption and indicate which ones provide the best security.
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Suppose you've set up a wireless router. Create a quick guide that instructs authorized users how to join it using their smartphones.
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Describe the differences between Wi-Fi and Bluetooth technologies, and give two examples of where you would expect to find each in use.
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Draw a storyboard to illustrate the steps you would take to set up a LAN and configure the router so that you can use wired and wireless connections.
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You arrive at work and one of your co-workers tells you that the router is down. Is it correct to surmise that your workstation will not be able to access other workstations, but will be able to access the Internet? Yes or no? img img
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Your computer is connected to a LAN, and you want easy access to files stored on several other computers on the LAN. Because all of the computers use Windows, you can set up a(n) img .
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You just bought a new Blu-ray player and it mentions that you can access the Internet to view Netflix movies. You assume that the player is equipped with img so that it can connect wirelessly to your LAN's router.
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Describe the characteristics of PANs, LANs, MANs, and WANs, plus provide an example of each.
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You're trying to figure out if your computer has a built-in Ethernet port. You see the port pictured to the right. Is that the port you should use for your RJ45 connector? Yes or no? img
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Create a list of network devices mentioned in this chapter. Write a brief description of each one.
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You install an 802.11b network, but it seems to stop working at various times. To begin troubleshooting, you look for any devices, such as cordless phones, that use the img GHz frequency.
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You're setting up an Ethernet wired network using a router. To access the router and its configuration software, you open your img and type the router's IP address.
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