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What is WDM? WDM is conceptually the similar as FDM, except that the multiplexing and demultiplexing includes light signals transmitted by fiber optics channel.
Describe some common threats to the hardware Theft of a computer, printer, or other resources. Tampering by a disinterested or frustrated employee who takes every chan
Question: a) In relation to network design, give two reasons why the building-block approach is favoured to the traditional approach. b) Explain the following steps in rela
Question 1 Discuss the following Evolution of Data Communication Elements of Data Communication System Question 2 Explain the following
Application Layer The application layer provides an interface between application entities and the users computer. This layer offers services to a variety of aspects of d
What are the data units at different layers of the TCP / IP protocol suite? The data unit formed at the application layer is known as a message, at the transport layer the data
PHYSICAL ADDRESSING IN A WAN: The physical addressing in a WAN is same as in LAN in the following way: The data is send in packets equivalent to frames. Every pack
What are the Access methods used in LAN: i. Switched access: It is used in LANs which are assigned around CBXs. Electronic switching is techniques are used to provide access
Q. Explain about Error Detection? Data can be corrupted during transmission because of accidents, Storms, sudden increase in electricity and voltage / decrease in signal power
Q. Explain Stop--and--Wait automatic repeat request? 1. Numbering frames prevents the retaining off duplicate frames. 2. Numbered acknowledgement are needed in case of delay
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