Exam Details
| Subject | network security | |
| Paper | ||
| Exam / Course | mca | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | June, 2017 | |
| City, State | gujarat, ahmedabad |
Question Paper
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
MCA SEMESTER—IV-EXAMINATION -SUMMER-2017
Subject code: 3640004 Date: 06/06/2017
Subject Name: Network Security
Time: 10:30 AM 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Expand following abbreviations 07
1. MIME 2. IEEE 3. WPA 4. SSH
5. PKI 6. DMZ 7. OSI
Define Following Terms with one/two line(s) definition 07
1. Encryption
2. Data Integrity
3. Cryptanalysis
4. Public Key
5. Password Protection
6. Network Layer
7. Hyper Text Browser
Q.2 What is OSI Security Architecture? Discuss OSI-SA with reference of security attack, mechanism and services. 07
Discuss network access security model with its diagram and services. 07
OR
List and briefly mark out categories of passive and active security attacks. 07
Q.3 Why do some block cipher modes of operation only use encryption while others use both encryption and decryption? Differentiate between a block cipher and a stream cipher. 07
What is triple encryption? Why the middle portion of 3DES is a decryption rather than an encryption? 07
OR
Q.3 What properties must a hash function have to be useful for message authentication? In the context of a hash function, what is a compression function? 07
What are the principal ingredients of a public-key cryptosystem? List and briefly define three uses of a public-key cryptosystem. 07
Q.4 What is the basic building block of an 802.11 WLAN? List and briefly define IEEE 802.11 services. 07
List out the security services provided by WTLS and describe with appropriate example. 07
OR
Q.4 Draw a neat and clean diagram of Secure Socket Layer stacks and compare the SSL 2.0 and SSL 3.0 architecture. 07
Describe three alternative approaches to providing WAP end-to-end security. 07
Q.5 What are the five principal services provided by PGP? Why does PGP generate a signature before applying compression? 07
1. What is the difference between transport mode and tunnel mode? 04
2. List out any 3 design requirements of HMAC 03
OR
Q.5 1. What do you understand by FIREWALL? Describe the various types of Firewall. 04
2. Why firewall is needed in a secure network? 03
1. List and briefly define three classes of intruders. 04
2. Elucidate how enveloped data is generated in SMIME. 03
GUJARAT TECHNOLOGICAL UNIVERSITY
MCA SEMESTER—IV-EXAMINATION -SUMMER-2017
Subject code: 3640004 Date: 06/06/2017
Subject Name: Network Security
Time: 10:30 AM 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Expand following abbreviations 07
1. MIME 2. IEEE 3. WPA 4. SSH
5. PKI 6. DMZ 7. OSI
Define Following Terms with one/two line(s) definition 07
1. Encryption
2. Data Integrity
3. Cryptanalysis
4. Public Key
5. Password Protection
6. Network Layer
7. Hyper Text Browser
Q.2 What is OSI Security Architecture? Discuss OSI-SA with reference of security attack, mechanism and services. 07
Discuss network access security model with its diagram and services. 07
OR
List and briefly mark out categories of passive and active security attacks. 07
Q.3 Why do some block cipher modes of operation only use encryption while others use both encryption and decryption? Differentiate between a block cipher and a stream cipher. 07
What is triple encryption? Why the middle portion of 3DES is a decryption rather than an encryption? 07
OR
Q.3 What properties must a hash function have to be useful for message authentication? In the context of a hash function, what is a compression function? 07
What are the principal ingredients of a public-key cryptosystem? List and briefly define three uses of a public-key cryptosystem. 07
Q.4 What is the basic building block of an 802.11 WLAN? List and briefly define IEEE 802.11 services. 07
List out the security services provided by WTLS and describe with appropriate example. 07
OR
Q.4 Draw a neat and clean diagram of Secure Socket Layer stacks and compare the SSL 2.0 and SSL 3.0 architecture. 07
Describe three alternative approaches to providing WAP end-to-end security. 07
Q.5 What are the five principal services provided by PGP? Why does PGP generate a signature before applying compression? 07
1. What is the difference between transport mode and tunnel mode? 04
2. List out any 3 design requirements of HMAC 03
OR
Q.5 1. What do you understand by FIREWALL? Describe the various types of Firewall. 04
2. Why firewall is needed in a secure network? 03
1. List and briefly define three classes of intruders. 04
2. Elucidate how enveloped data is generated in SMIME. 03
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