Section A: Answer the given problems in not more than 1000 words each.

problem 1: Describe how three-tier architecture tries to overcome the limitations of two-tier architecture. describe different kinds of middle ware products.

problem 2: What do you mean by the term SMTP? describe its functions and limitations. Describe how POP and IMAP try to solve the problems of SMTP?

problem 3: Describe how information can be secured in the Internet.

Section B: Answer the given problems in not more than 500 words each.

problem 4: Describe the necessary elements necessary to make a Virtual Private Network (VPN) functional.

problem 5: What do you mean by the term World Wide Web (WWW)? How does it work?

problem 6: Describe the client-server architecture and also describe its limitations.

problem 7: Describe in brief different kinds of computer viruses and recommend remedies for avoiding them.

problem 8: Describe the concept of Extranet. Describe its benefits.

problem 9: Describe the features of Z 39.50.