Chapter 1 Questions
7. How do local area networks (LANs) differ from metropolitan area networks (MANs), wide area networks (WANs), and backbone networks (BNs)?
Local area networks (LANs) consist of microcomputers located in a same general area. LANs usually share circuits where computers take turns using the same circuit. In a metropolitan area networks (MANs), a network usually covers a citywide area. Wide area networks (WANs) span a large geographical area. WANs span a larger area than MANs. Backbone networks (BNs) interconnect all networks on a single site. BNs is a large network which many networks within an organization are connected.
14. Explain how a message is transmitted from one computer to another using layers.
Each computer in the network has software that operates at each of the layers and performs the functions required by those layers. Each layer in the network uses a formal language, or protocol, which is simply a set of rules that define what the layer will do and that, provides a clearly defined set of messages that software at the layer needs to understand. In general, all messages sent in a network pass through all layers.
17. Describe two important data communications standards-making bodies. How do they differ?
The International Organization for Standardization (ISO) makes technical recommendations about data communication interfaces. The Telecommunications group (ITU-T) is the technical standards-setting organization of the United Nations International Telecommunications Union (ITU). Postal Telephone and Telegraphs (PTTs) are telephone companies outside of the United States. ITU-T establishes recommendations for use by PTTs, other common carriers, and hardware and software vendors.
Chapter 2 Mini Case
* a. Classify the two alternatives in terms of what type of application architecture they use. * One alternative is client-based architecture. The clients are microcomputers on LAN and the server is...