end of CH 1 questions Flashcards
How can data communication networks affect businesses?
by being the foundations for distributed systems in which information system applications are divided among a network of computers.
Discuss three important applications of data communication networks in business and personal use.
email, videoconferencing, and the Internet.
How do LANs differ from WANs, and BNs?
A Backbone Network (BN) is a large central network that connects most everything on a single company site.
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A Metropolitan Area Network (MAN) encompasses a city or county area.
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A Wide Area Network (WAN) spans cities, states, or national boundaries.
What is a circuit?
The circuit is the pathway through which the messages travel.
It can be made up of a copper wire, although fiber optic cable and wireless transmission are becoming more common.
What is a client?
The client is the input or output hardware device at the other end of a communication circuit.
It typically provides remote users with access to the network and the data and software on the server.
What is a server?
The server stores data or software that can be accessed by the clients, or remote users of a hardware input or output device.
Why are network layers important?
the strategy of using more simplistic network layers allows vastly different kinds of equipment to be able to have connectivity over a common platform or network, using protocols and standards that are applicable to each narrow slice of the network.
What is the purpose of a data communications standard?
The use of standards makes it much easier to develop software and hardware that link different networks because software and hardware can be developed one layer at a time.
What are three of the largest inter-exchange carriers (IXCs) in North America?
Two of the largest inter-exchange carriers (IXCs) in North America are AT&T and Sprint, and the formerly large MCI was acquired in a post bankruptcy merger with Verizon.
How many bits (not bytes) are there in a 10 page text document?
Hint: There are approximately 350 words on a double-spaced page. First, some assumptions must be made. Assume each word averages seven letters and there is one space between each word. Next assume we are using 8-bit ASCII.
Multiply 350 words by 8 bytes (7 letters plus a space) to get 2,800 bytes per page.
Multiply 2,800 by 10 pages to get 28,000
Multiply 28,000 bytes by 8 bits per byte to get 224,000 bits
