B5.3-R3: NETWORK MANAGEMENT & INFORMATION SECURITY
: JULY 2005

NOTE:

1. Answer question 1 and any FOUR questions from 2 to 7.
2. Parts of the same question should be answered together and in the same sequence
   
   TIME: 3 HOURS TOTAL MARKS: 100
   

1.  

   1. What are agents in network management system?
   2. What is a proxy and how does it work?
   3. What are the three key properties of hash functions?
   4. Differentiate between passive and active attacks on a computer.
   5. Is a firewall sufficient to secure network or do we need anything else?
   6. How can an intrusion detection system actively respond to an attack?
   7. What is non-repudiation? How does Asymmetric key encryption ensure non-repudiation?
   (7x4)
2. 1. What is a digital signature? Which algorithms are used to digital signatures?
   2. What is IPSec? Explain.
   3. Differentiate between Symmetric Key and Asymmetric Key algorithms? Which is most commonly used for encryption on the web?
   (4+6+8)
3. 1. What are DOS attacks? Explain one of them.
   2. What other countermeasures besides IDS are there in a network? What are different types on Intrusion Detection Systems?
   3. What are Intrusion Prevention Systems? Explain.
   (6+6+6)
4. 1. Explain briefly about Mandatory Access Control and Discretionary Access Control.
   2. What are Trojans? Give example of at least one commonly known Trojan?
   3. Differentiate between works and viruses.
   (6+6+6)

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     5.

1. Explain briefly about penetration testing and post scanning.
2. What are the different levels in TCP/IP at which web security may be implemented? Illustrate with examples.
3. What is Demilitarized Zone? Explain with a diagram.
(6+6+6)


6.

1. How are Digital Certificates used to provide third party trust?
2. What are the components of X.506 v3 format for digital signatures?
3. What is CRL? How is it used to validate digital certificates?
(5+6+7)



7.
Write short notes on the following:
1. Public Key infrastructures (PKI)
2. Reverse Proxy
3. Virtual Private Network (VPN)
(6+6+6)

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