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1 CS / IT 321 (CR) Total No. of Questions : 09 ] [ Total No.of Pages : 02 III/IV B. TECH. DEGREE EXAMINATIONS, OCT / NOV Second Semester COMPUTER SCIENCE & ENGINEERING NETWK SECURITY Time : Three Hours Maximum Marks : 70 Answer Question No. 1 Compulsory. 14x1=14 M Answer ONE question from each Unit. 4x14=56 M 1. Briefly explain the following : a) What is a threat? b) Using Fermat's theorem, find mod 11. c) Define steganography. d) What is a worm? e) Benefits of IPSec. f) Why modular arithmetic is used in cryptography? g) Characteristics of firewalls. h) Differences between MD4 and SHA. i) What is the disadvantage of ECB mode of operation? j) Define discrete logarithm. k) Name any two methods of testing prime numbers. l) Services provided by PGP. m) What is a hash function? n) Levels of hackers. UNIT - I 2. a) Briefly explain about the classical encryption techniques. b) Encrypt a message "Behavior is a mirror in which everyone displays his own image" with the keyword "monarchy" using Playfair cipher technique. 3. Write down Triple DES algorithm and explain with neat diagram. Compare it with AES algorithm also. P.T.O.
2 UNIT - II CS / IT 321 (CR) 4. a) Explain the principles of public key crypto system. b) Perform encryption and decryption using the RSA algorithm for p=7, q=23, e=79, M a) Explain about Chinese remainder theorem and its applications. b) State Euler's theorem to find the gcd with example. UNIT - III 6. a) What is Kerberos? Explain how it provides authenticated service. b) Describe the requirements of Hash function. 7. Briefly explain with the diagram the SHA-512 processing of a single 1024-bit block. UNIT - IV 8. a) List out the key features of secure electronic transactions and explain in detail. b) Discuss the services provided by SSL Record Protocol. 9. a) Explain SSL handshake protocol with a neat diagram. b) Describe the different techniques used by firewalls to control access and enforce a security policy. 2
3 CS/IT 321 (CR) Total No. of Questions : 09] [Total No. of Pages : 02 III/IV B.TECH DEGREE EXAMINATIONS, MARCH/APRIL 2015 SECOND SEMESTER COMPUTER SCIENCE & ENGINEERING NETWK SECURITY Time: Three Hours Maximum marks:70 Answer Question No. 1 Compulsory 14x1=14 Answer ONE question from each unit 1. Briefly explain following: a) Why ESP include a padding field? 1 4x14=56 b) Write down the difference between public key and private key crypto systems. c) Active attacks Vs passive attacks d) Write down the purpose of S-Box in DES. e) Difference between worm and virus. f) List out the parameters of AES. g) Why random numbers are used in Network security? h) State Euler s theorem. i) What are birthday attacks? j) List out the two approaches of digital signatures. k) Differentiate spyware and virus. l) What is Trojan Horse? m) Properties of hash function in cryptography n) What is a logic bomb? UNIT-I 2. (a) Discuss about various components of OSI security architecture. (b) Explain the cipher feedback and output feedback block cipher modes of operation. P.T.O
4 3. Explain in detail the encryption and decryption process of DES algorithm. UNIT-II 4. (a) Explain do Elliptic curve take part in Encryption and Decryption process? (b) Explain the different ways of key distributions in Asymmetric key cryptography. 5. (a) Briefly explain Diffie-Hellman key exchange. (b) Users A and B use the Diffie-Hellman key exchange technique with a common prime q=71 and a primitive root α=7. If user A has private key X A =5, what is A s public key Y A? UNIT-III 6. (a) Explain Digital Signature with ElGamal public key crypto system. (b) Discuss the PGP message generation and reception process. 7. (a) Explain the general X.509 public key certificate. (b) What is a hash function? What are the basic uses of a hash function? UNIT-IV 8. (a) Define intruder. Give the characteristics of different classes of intruders. (b) Explain the parameters that define session state and connection state in SSL. 9. (a) Explain different types of firewall and its configuration in detail. (b) List out the participants of SET system, and explain in detail. 2
5 CS / IT 321 (RR) Total No. Questions : 9 Total No. of Pages : 2 III / IV B.TECH. DEGREE EXAMINATION, MARCH / APRIL 2015 SECOND SEMESTER CS / IT COMPUTER NETWKS Time : 3 Hours Maximum Marks : 70 Answer question No.1 compulsory. (7 x 2 = 14) Answer ONE question from each unit. (4 x 14 = 56) 1. a) Ethernet b) TCP/UDP c) Tunneling d) IP Address and Socket e) Subnet and Routing f) Crash Recovery g) HTTP and FTP UNIT I 2. Explain in detail about OSI Reference model with neat diagram. 3. What is a Routing? Explain in detail about Distance Vector and Hierarchical Routing algorithms. UNIT II 4. What is Congestion? Explain in detail about congestion prevention policies. 5. a) Explain in detail about the interior gateway routing protocol and the exterior gateway routing protocol. b) Discuss in detail about IPV4. 1 (P.T.O)
6 UNIT III 6. a) Explain detail about Berkeley sockets. b) Explain in detail about connection establishment and multiplexing. 7. a) Describe the Remote Procedure Call. b) Explain in detail about the TCP segment header. UNIT IV 8. a) Discuss in detail about the DNS. b) Explain in detail about static web documents and the user agent. 9. Explain the following: i) Audio Compression ii) Message formats ii) Name servers iv) HTTP 2
7 CS/IT 321 (RR) Total No. of Questions : 09 ] [ Total No.of Pages : 02 III/IV B. TECH. DEGREE EXAMINATIONS, OCT / NOV Second Semester CS / IT COMPUTER NETWKS Time : Three Hours Maximum Marks : 70 Answer Question No. 1 Compulsory. 7x2=14 M Answer ONE question from each Unit. 4x14=56 M 1. a) Relationship of services to protocols. b) Connection oriented and connection less services. c) Jitter control. d) Transport service primitives. e) Why Pseudo header is used in computing TCP Checksum? f) Name Servers. g) HTTP. UNIT - I 2. a) Explain the following routing algorithms : (i) Distance vector. (ii) Hierarchical. (iii) Broadcast. b) Write a brief on Ethernet. 3. a) Compare and contrast OSI reference model and TCP/IP reference model. b) With the help of approximate examples explain various types of connection oriented and connection less services. UNIT - II 4. a) Explain different techniques for achieving good quality of service. b) Explain BGP-The Exterior Gateway Routing Protocol. P.T.O.
8 CS/IT 321 (RR) 5. a) Write a brief on Congestion control in Datagram Subnets and Load Shedding. b) Explain different congestion prevention policies. UNIT - III 6. a) Briefly discuss TCP connection Management. b) Write a brief on Multiplexing, crash recovery. 7. a) What are the different flags in TCP segment? Explain each of them. b) Write a brief on Remote Procedure Call. UNIT - IV 8. a) Give the architectural overview of World Wide Web and explain static and dynamic web documents. b) Write a brief on DNS Name Space and its purpose. 9. Write a brief on the following : a) Audio compression. b) Video compression. c) Video on Demand. 2
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