Describe the five-layer network using block diagrams, Computer Network Security

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Problem 1:

a) One of the limitations of file processing systems is data inconsistency. Briefly explain with the help of an example what do you understand by this phrase.

b) Explain the use of the data dictionary in databases.

c) Write short notes on System software.

Problem 2:

Describe the five-layer network using block diagrams.

Problem 3:

1. Describe local area network (LAN) and wide area network (WAN) using appropriate examples.

2. What is an Ethernet? Explain the principle behind Ethernet.

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