- The Type of error checking used
- The data compression method
- How the sending device will indicate that it has finished sending a message
- How the receiving device will indicate that it has received a message
3) Identify the four components of all ethernet frames.
4) Describe how data flows over an ethernet network from the source to the intended destination.
Ethernet communication is performed through 'frames', which contains packets of information. The frames are individually sent by the sending device and receipted back to the sender from the receiver
5) How does a collision occur on a network? How does ethernet avoid repeated collisions of the same transmissions?
A collision occurs when two or more computers send information into the network at the same time mistakingly, in which time the computers cease further transmissions, and waits a random amount of time.
6)Describe how a token is used in a token ring network
A token is a special signal that continuously travels around the network. If a device wishes to transmit a message over the network, it must attach itself to the token, and is carried to it's destination.
7) TCP/IP uses smaller packets than other protocols. Why is this an advantage on the internet?
The smaller packets can travel can travel down many different paths, and enable load balancing.
8) What standard does a Wi-Fi network use?
Wi-Fi uses the 802.11b or 802.11g standards.
Network hardware and software.
1) List a number of tasks undertaken by a network operating system.
Network operating systems control traffic on the network, and defines how devices communicate with each other. They control file access, managing print queues, keeping track of users their their userIDs and passwords, authenticating access to network servers and maintaing a log of network usage.
2) What is the role of a network interface card?
Network interface cards are used to link a computer or resource to a network.
3) Describe the process of roaming on a Wi-Fi network.
Because if the user moves out of the range of the initial AP, they can still access the network.
4) Why would a cafe establish a hot spot on their premises?
For the benefit of the customers. The hot spots allow the customers with portable computers are able to connect to the network without any regard for the particular network they are connected to.
5) Why would networks use switches rather than ordinary hubs?
Switches perform the same task, but do the task much faster, and more efficiently, due to them not sending anywhere near as much traffic as a hub.
6) What are Routers used for?
Routers allow several remote LANs to connect over a WAN, or to join LANs together into a bigger LAN.
7) How does a modem enable a computer to communicate with a network over a standards telephone line?
A modem modulates the digital data it receives from a computer into an analog signal that is compatible with a telephone line, and converts analog signals into digital data that can be transmitted to the revceiving computer.
8) How does a DSL modem differ from a dial-up modem?
Dial-up modems convert the Digital Signals into analog signals, this is not necessary with DSL modems, because they can already respond to digital signals.
Transmission Media
1) Why do new networks use CAT 5 standard cable rather than CAT 3?
Because CAT 5 cabling can carry much larger amounts of data much further, making it much faster.
2) What are some of the disadvantages of using a CAT 5 cable? Why is CAT 5 cable used in so many installations?
3) Why is Fibre-optic cable often used to connect major hubs inside buildings as well as between buildings?
Because it allows many users to use a single strand of the cabling at the same time, and use of it's hightened speed over other forms of cabling.
4) What advantages does wireless networking have over a network that only uses physical transmission media?
It can be installed anywhere, including places where it is difficult to install physical transmission methods, or when it is just easier than having many cables tethered to a single spot.
5) What limitations applies to microwave transmissions?
It requires line-of-sight transmission, so if anything obscures the connection between the sending dish and the receiving dish, the transmission will not be received by the other end.
6) Why is radio wireless networking preferable to infra-red wireless networking?
Because it can be transmitted over longer distances, and is much more flexible because it allows greater portability. Infra-red can only be used effectively over short distances up to five meters.
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