The diagram below shows four common network topologies A, B, C and D.
i) Name the network topologies labeled a, B, C and D.
ii) Explain what happens if server X in topology A fails. iii) List two problems associated with network topology B. iv) List two disadvantages associated with network topology D. b) Differentiate between Interment and World Wide Web: c) Describe the following network services and identify their applications. i) Voice mail ii) Video conferencing
ANSWERS
i) Name the network topologies labeled A, B, C and A Tree/Hierarchy B Ring C Bus/Multi drop D Star ii) Explain what happens if server X in topology A fails. The terminal connected to X will be affected/stop communicating with the ret of the network iii) List two problems associated with network topology B. Difficult to trouble shoot "- Failure of one terminal results in network breakdown Extra cost of extra NIC card. iv) List two disadvantages associated with network topology D. Failure of central device/server results I total collapse of network Extra cost of cabling as each terminal must be cabled separately to the hub. b) Differentiate between Internet and World Wide Web. The Internet is a massive network of networks, a networking infrastructure. It connects millions of computers together globally, forming a network in which any computer can communicate with any other computer as long as they are both connected to the Internet. Information that travels over the Internet does so via a variety of languages known as protocols. The World Wide Web, or simply Web, is a way of accessing information over the medium of the Internet It is an information-sharing model that is built on top of the Internet The Web uses the HTTP protocol, only one of the languages spoken over the Internet, to transmit data. Web services, which use IfTTP to allow applications to communicate in order to exchange business logic, use the Web to share information. The Web also utilizes browsers, such as Internet Explorer or Netscape, to access Web documents called Web pages that are linked to each other via hyperlinks. Web documents also contain graphics, sounds, text and video. c) Describe the following network services and identify their applications. i) Voice mail Voicemail (or voice matt, voicemail or VMS, sometimes called message bank) is a centralized system of managing telephone messages for a large group of people. In its simplest form it mimics the functions of an answering machine, uses a standard telephone handset for the user interface, and uses a centralized, computerized system rather than equipment at the individual telephone. Voicemail systems are much more sophisticated than answering machines in that they can: Answer many phones at the same time Store incoming voice messages in personalized mailboxes associated with the user's phone number Enable users to forward received messages to another voice mailbox send messages to one or more other user voice mailboxes Add a voice introduction to a forwarded message Store voice messages for future delivery Make calls to a telephone or paging service to notify the user a message has arrived in his/her mailbox Transfer callers to another phone number for personal assistance Play different message greetings to different callers. ii) Video conferencing. A videoconference (also known as a video teleconference) is a set of interactive telecommunication technologies which allow two or more locations to interact via two-way video and audio transmissions simultaneously. It has also been called visual collaboration and is a type of groupware.
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