S T U D I O S PYQs COMPUTER NETWORKING BTECH 3RD YEAR SHEET
Total No. of Printed Pages:3 Enrollment No...................................... Faculty of Science End Sem (Odd) Examination Dec-2018 CA3CO10 Computer Networks Programme: BCA Duration: 3 Hrs. Branch/Specialisation: Computer Application Maximum Marks: 60 Note: All questions are compulsory. Internal choices, if any, are indicated. Answers of Q.1 (MCQs) should be written in full instead of only A, B, C or D. Q.1 i. ii. iii. iv. v. vi. Which layers of the OSI model are host-to-host layers? (a) Transport, Session, Presentation, Application (b) Network, Transport, Session, Presentation (c) Data link, Network, Transport, Session (d) Physical, Data link, Network, Transport Repeater operates in which layer of the OSI model? (a) Physical layer (b) Data link layer (c) Network layer (d) Transport layer Which of the following is not a guided transmission Media? (a) Magnetic Media (b) Infrared Transmission (c) Twisted Pairs (d) Fiber Optics Fiber optics possess following properties (a) Immune electromagnetic interference (b) Very less signal attenuation (c) Very hard to tap (d) All of these Which of the following is the Error correction code: (a) Parity check code (b) Hamming code (c) CRC Code (d) Checksum code Sender window size of Selective repeat ARQ is: (a) At most n/2 (b) At most n*2 2 (c) At most n (d) At most 2n-1 1 1 1 1 1 1 P.T.O.
[2] vii. viii. ix. x. Q.2 i. ii. iii. Q.3 i. ii. iii. Q.4 i. ii. iii. A data unit in Network layer is called: (a) Frame (b) Packet (c) Datagram (d) None of these Address size of IPv6 is: (a) 32 bit (b) 64 bit (c) 128 bit (d) 256 bit Which of the following protocol is/are defined in Transport layer? (a) FTP (b) SMTP (c) UDP (d) Telnet DNS is the abbreviation of: (a) Dynamic Name System (b) Dynamic Network System (c) Domain Name System (d) Domain Network Service Attempt any two: Define the following: (a) Computer Network (b) Internet (c) Intranet (d) WAN With the help of diagram write the working of various layers of OSI Model. Write the various network software and hardware with their working. Attempt any two: Explain the working of two guided media. Briefly describe: (a) Radio Transmission (b) Infrared Transmission Explain the working of public switched telephone network with diagram. Attempt any two: Explain the working of Hamming code with example 110011. Discuss the working of Go-Back-N ARQ. Also explain how exceptional conditions are handled? Briefly describe two multiple access protocols. ii. iii. Attempt any two: Define the following: (a) Routing (b) Broadcast routing (c) Multicast routing (d) Hierarchical routing Differentiate distance vector and link state routing. Write the need and various classes of IpV4 address with example. i. ii. iii. 1 Q.5 Attempt any two: Differentiate TCP and UDP. Explain the various protocols used in electronic mail. Briefly explain the working of digital signature. i. 1 1 5 5 5 1 Q.6 5 ****** 5 5 5 5 5 5 5 5 5 5 5
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Marking Scheme CA3CO10 Computer Networks Q.1 i. ii. iii. iv. v. vi. vii. viii. ix. x. Q.2 i. ii. iii. Q.3 i. ii. Which layers of the OSI model are host-to-host layers? (a) Transport, Session, Presentation, Application Repeater operates in which layer of the OSI model? (a) Physical layer Which of the following is not a guided transmission Media? (b) Infrared Transmission Fiber optics possess following properties (d) All of these Which of the following is the Error correction code: (b) Hamming code Sender window size of Selective repeat ARQ is: (a) At most n/2 A data unit in Network layer is called: (b) Packet Address size of IPv6 is: (c) 128 bit Which of the following protocol is/are defined in Transport layer? (c) UDP DNS is the abbreviation of: (c) Domain Name System Attempt any two: Define the following: 1.25 marks each (a) Computer Network (b) Internet (c) Intranet (d) WAN Diagram of OSI Layers of OSI Model. Names of network software and hardware Working of network software and hardware (1.25 mark *4) 1 Q.4 i. 1 ii. 1 iii. 1 Q.5 1 i. 1 ii. 1 iii. 1 1 Q.6 i. 1 ii. iii. diagram. of public switched telephone network Working of public switched telephone network 2 marks 3 marks 5 Attempt any two: Explanation of Hamming code Example 110011. Working of Go-Back-N ARQ with diagram Exceptional conditions Go-Back-N ARQ Two multiple access protocols.2.5 marks each 3 marks 2 marks 3 marks 2 marks (2.5 marks * 2) 5 Attempt any two: Define the following: 1.25 marks each (1.25 mark *4) (a) Routing (b) Broadcast routing (c) Multicast routing (d) Hierarchical routing Difference b/w distance vector and link state routing. At least 5 differences for each Need of IpV4 address 1 mark Classes of IpV4 address 4 marks Attempt any two: Difference b/w TCP and UDP. At least 5 differences for each Three protocols with description Diagram of digital signature Working of digital signature. 5 ****** 2 marks 3 marks 2 marks 3 marks. Attempt any two: Working of two guided media.2.5 marks each Briefly describe: 2.5 marks each (2.5 marks *2) (a) Radio Transmission (b) Infrared Transmission 5 5 5 5 5 5 5 5 5 5 2 marks 3 marks 5 5
Total No. of Printed Pages:3 Enrollment No...................................... Faculty of Engineering / Science End Sem (Odd) Examination Dec-2019 CA3CO10 Computer Networks Programme: BCA-MCA (Integrated) / BCA Duration: 3 Hrs. Branch/Specialisation: Computer Application Maximum Marks: 60 Note: All questions are compulsory. Internal choices, if any, are indicated. Answers of Q.1 (MCQs) should be written in full instead of only a, b, c or d. Q.1 i. ii. iii. iv. v. vi. The first Network 1 (a) CNNET (b) NSFNET (c) ASAPNET (d) ARPANET In TCP IP Model, when data is sent from device A to device B, the 1 5th layer to receive data at B is (a) Application layer (b) Transport layer (c) Link layer (d) Session layer Bits can be sent over guided and unguided media as analog signal by 1 (a) Digital modulation (b) Amplitude modulation (c) Frequency modulation (d) Phase modulation The physical layer concerns with 1 (a) Process to process delivery (b) Application to application delivery (c) Bit-by-bit delivery (d) None of these Which sublayer of the data link layer performs data link functions 1 that depend upon the type of medium? (a) Logical link control sublayer (b) Media access control sublayer (c) Network interface control sublayer (d) None of these The technique of temporarily delaying outgoing acknowledgements so 1 that they can be hooked onto the next outgoing data frame is called (a) Piggybacking (b) Cyclic redundancy check (c) Fletcher’s checksum (d) None of these P.T.O.
[2] vii. viii. ix. x. The size of IP address in IPv6 is (a) 4 bytes (b) 128 bits (c) 8 bytes (d) 100 bits In Multicast Routing Protocol, flooding is used to broadcast packets, but it creates (a) Gaps (b) Loops (c) Holes (d) Links User datagram protocol is called connectionless because (a) It sends data as a stream of related packets (b) All UDP packets are treated independently by transport layer (c) It is received in the same order as sent order (d) None of these A web cookie is a small piece of data (a) Sent from user and stored in the server while a user is browsing a website (b) Sent from root server to all servers (c) Sent from a website and stored in user’s web browser while a user is browsing a website (d) None of these 1 iii. Explain the working of Selective Repeat ARQ with the help of diagram. 1 Q.5 i. ii. 1 iii. Attempt any two: What is Routing? Explain any one routing algorithm in detail. Why congestion occurs in networks? Explain back pressure & choke packet congestion control approaches. Explain the following: (a) Connection-oriented services & Connectionless services (b) Types of IPv6 addresses with its address format i. ii. iii. Q.3 i. ii. iii. Q.4 i. ii. Attempt any two: Explain TCP/IP reference model. Briefly describe the role of TCP/IP protocol in Internet. Explain LAN, MAN, WAN & PAN with examples. What is the need of layered architecture? Explain. Also write the advantages of layered architecture. Attempt any two: Explain basic working principle of optical fiber cable. Explain single mode & multimode fiber. Explain packet switching & circuit switching methods. Briefly describe: (a) Microwave Transmission (b) Light Transmission Attempt any two: What do mean by framing? Explain any two framing techniques. Explain the working of slotted ALOHA. Also calculate its throughput. 5 5 5 1 Q.6 i. ii. iii. Attempt any two: Explain services provided by transport layer & application layer. What is cryptography? Explain public key & private key cryptography. Explain SMTP & HTTP protocols in detail. ****** Q.2 5 5 5 5 5 5 5 5 5 5 5 5
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Marking Scheme CA3CO10 Computer Networks ii. Q.1 The first Network (d) ARPANET ii. In TCP IP Model, when data is sent from device A to device B, the 5th layer to receive data at B is (a) Application layer iii. Bits can be sent over guided and unguided media as analog signal by (a) Digital modulation iv. The physical layer concerns with (c) Bit-by-bit delivery v. Which sublayer of the data link layer performs data link functions that depend upon the type of medium? (b) Media access control sublayer vi. The technique of temporarily delaying outgoing acknowledgements so that they can be hooked onto the next outgoing data frame is called (a) Piggybacking vii. The size of IP address in IPv6 is (b) 128 bits viii. In Multicast Routing Protocol, flooding is used to broadcast packets, but it creates (b) Loops ix. User datagram protocol is called connectionless because (b) All UDP packets are treated independently by transport layer x. A web cookie is a small piece of data (c) Sent from a website and stored in user’s web browser while a user is browsing a website i. Q.2 i. ii. iii. Q.3 Attempt any two: TCP/IP reference model Role of TCP/IP protocol in Internet Explain LAN, MAN, WAN & PAN with examples 1.25 marks for each Need of layered architecture Advantages of layered architecture Attempt any two: 3 marks 2 marks 1 iii. 1 1 i. 1 ii. 1 iii. 1 Q.5 i. 1 ii. 1 iii. 1 1 Q.6 i. 5 5 (1.25 marks * 4) 3 marks 2 marks Q.4 5 ii. iii. Description of principle of optical fiber cable Description of single mode & multimode fiber Description of packet switching methods Description of circuit switching methods. Briefly describe: (a) Microwave Transmission (b) Light Transmission Attempt any two: Description of framing Any two framing techniques Description of slotted ALOHA Calculate its throughput Description of Selective Repeat ARQ Diagram 2 marks 3 marks 2.5 marks 2.5 marks ****** 5 5 2.5 marks 2.5 marks 1 mark 4 marks 2 marks 3 marks 4 marks 1 mark Attempt any two: Routing 2 marks Any one routing algorithm 3 marks Why congestion occurs in networks 2 marks Back pressure & choke packet 3 marks Explain the following: (a) Connection-oriented services & Connectionless services 2.5 marks (b) Types of IPv6 addresses with its address format 2.5 marks Attempt any two: Description of transport layer Description of application layer Cryptography Public key & private key cryptography Description of SMTP Description of HTTP 5 2.5 marks 2.5 marks 1 mark 4 marks 2.5 marks 2.5 marks 5 5 5 5 5 5 5 5 5
Total No. of Printed Pages:3 Enrollment No...................................... Faculty of Engineering End Sem (Odd) Examination Dec-2018 CA5CO12 Computer Networks Programme: MCA Duration: 3 Hrs. Branch/Specialisation: Computer Application Maximum Marks: 60 Note: All questions are compulsory. Internal choices, if any, are indicated.Answers of Q.1 (MCQs) should be written in full instead of only a, b, c or d. Q.1 i. ii. iii. iv. v. vi. vii. Delivery of data is delayed in __________circuit switching 1 because data must be stored and retrieved from RAM (a) Space division switching (b) Virtual switching (c) Message switching (d) Packet switching ______ is the bandwidth of the signal that ranges from 40 KHz to 1 4 MHz (a) 36 MHz (b) 360 MHz (c) 3.96 MHz (d) 396 MHz Prevention of overflow of receiver buffer is known as 1 (a) Error control (b) Flow control (c) Both (a) and (b) (d) None of these In CRC, the divisor is always __________ the CRC 1 (a) Same size as CRC (b) One bit less than CRC (c) One bit more than CRC (d) No matter whatever Error is _______ in wireless transmission than wired transmission 1 (a) More (b) Less (c) Half (d) None of these The connection between switches is called__________ 1 (a) Transmission path (b) Virtual path (c) Virtual circuit (d) All of these IP is responsible for ______________ communication while TCP 1 is responsible for ________ communication (a) Host-to-host; process-to-process (b) Process-to-process; Host-to-host (c) Process-to-process; node-to-node (d) Node-to-node; process-to-process P.T.O.
[2] Q.6 viii. ix. x. Q.2 i. ii. iii. Q.3 i. ii. OR iii. Q.4 i. ii. iii. Q.5 i. ii. iii. A Bridge can________________ (a) Filter a frame (b) Forward a frame (c) Extend a LAN (d) All of these A DNS ______________ server gets its data from another DNS server (a) Primary (b) Secondary (c) Root (d) All of these A user computer usually needs ____________ to sned email (a) Only SMTP (b) Only POP (c) Both SMTP and POP (d) FTP Attempt any two: Explain different ways in which the OSI reference model and TCP/IP Model are like and different. How many number of signal levels are needed to transmit 128 Kbps over noiseless channel with bandwidth of 20 KHz? Explain and compare ATDM and STDM. Explain 1-bit sliding window protocol with its working. Prove that the throughput of the Slotted Aloha is double of the Pure Aloha. Message X9+X7+X5+X3+1is received using generator polynomial X3 + 1. Is it error free? Attempt any two: Compare LAN standards 802.3, 802.4 and 802.5. In the IEEE 802.11 specification, the length of the SIFS period must be shorter than the DIFS period. Why? Write down the short note on the following: (a) ATM (b) ISDN Attempt any two: Explain the distance vector routing algorithm. Also explain count to infinity problem. Compare the IPv4 and IPv6 on at least 5 criteria. Differentiate between the following: (a) Repeater and Amplifier (b) Router and Gateway 1 i. ii. 1 iii. 1 5 5 5 3 7 7 5 5 5 5 5 5 Attempt any two: Explain the Congestion control algorithms. Also compare them. Explain the working of DNS. Also explain the use of DNS with suitable example. Write brief notes on the following: (a) WWW (b) Email ****** 5 5 5
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