Computer Networks - Question bank & Methods

DEPARTMENT OF MCA

MC7301 COMPUTER NETWORKS

UNIT I                  NETWORK FUNDAMENTALS                                                                             

1.      Explain the categories of networks      (8 marks)

Ans:     LAN, WAN, MAN –  diagram & Explanation, uses, differences – each 2 lines – max 3 pages

2.      Explain the OSI model Layer.  (16 marks)

·          OSI –expansion & purpose – 2 lines

·         7 layers names in table format

·         2 functions of each layer – 2 layers per page

·         Need not draw diagrams for each layer – max 5 pages

3.      Explain the TCP/ IP protocol architecture.       (8 marks)

·         Tcp/ip  - explanation in 2 lines

·         5 layers diagram

·         Min 2 functions of each layer

·         Need not draw diagram for each layer

·         Max 3 pages

4.      What is topology? Explain in detail.    (16 marks)

·         Topology – meaning – 2 lines

·         6 types of topology in table format

·         Diagram & explanation

·         2 advantages & disadvantages

·         Max 5 pages

5.      Explain the transmission media                       (16 marks)

·         Transmission media – meaning – 2 lines

·         Wired & wireless transmission – meaning – 2 lines

·         3 types – twisted pair – coaxial – fiber optic cable

·         Diagram  - full page

·         Explanation half page

·         2 advantages & disadvantages

·         Max 5 pages

UNIT II           DATA LINK LAYER                                                                                               

1.      What is flow control? Explain in detail.           (16 marks)

·         Flow control – meaning – 2 lines

·         2 types – stop and wait  - sliding window

·         Stop and wait – meaning – diagram – explanation – 2 advantages & disadvantages

·         Sliding window – meaning – diagram – explanation - – 2 advantages & disadvantages

·         Max 5 pages

2.      What is Automatic Repeat Request (ARQ)? Explain in detail.             (16 marks)

·         Retransmission of lost or damaged frames

·         3 types – stop and wait ARQ – go back n ARQ – selective reject ARQ

·         Meaning – diagram – explanation – 2 advantages & disadvantages

·         Max 5 pages

3.      Briefly explain the error detection techniques with examples              (16 marks)

·         Error control – meaning – 2 lines

·         4 types of error detection techniques

·         VRC – LRC – CRC- Check sum

·         Example – explanation –

·         Max 5 pages

4.      What is MAC? Explain in detail.                      (8 marks)

·         Meaning – 2 lines

·         Frame format – diagram & 1 line explanation

·         Aloha – slotted aloha – CSMA – CSMA/CD (1-persistence, n-persistence, p-persistence) – CSMA/CA (polling, select)

·         Max 3 pages

5.      What is Ethernet? Explain in detail.     (8 marks)

·         Meaning – 2 lines

·         Frame format – diagram & 1 line explanation

·         4 types of Ethernet – standard – fast Ethernet– 1GB Ethernet – 10 GB Ethernet

·         Max 3 pages

6.      What is token ring? Explain in detail.  (8 marks)

·         Meaning -2 lines

·         Diagram – full page

·         Explanation – 1 page

·         Max 3 pages

7.      Briefly explain the wireless LAN architecture (12 marks)

·         Meaning – 2 lines

·         2 types – adhoc & infrastructure – diagrams & explanation

·         BSS (basis service sets) – diagram & explanation

·         ESS (Extended service set) – diagram & explanation

·         Max 4 pages

8.      Explain the Bluetooth architecture.      (8 marks)

·         Meaning – 2 lines

·         2 types – piconet – scatternet

·         Diagrams & explanation

·         Max 3 pages

9.      Explain the bridges                  (6 marks)

·         Meaning – 2 lines

·         3 types – transparent bridge – translation bridge – source routing bridge

·         Diagram & explanation

·         Max 3 pages

UNIT III         NETWORK LAYER                                                                         

1.      What is switching? Explain in details   (6 marks)

·         Meaning – 2 lines

·         3 types – circuit switching – message switching – packet switching

·         Diagram & explanation

·         Max 3 pages

2.      Explain the IP addressing.                    (10 marks)

·         Meaning – 2 lines

·         5 classes of IP addressing – class A – B – C – D – E

·         Diagram & explanation

·         Max 4 pages

3.      Explain the IPV6.                    (8 marks)

·         Meaning – 2 lines

·         Packet format – diagram & explanation

·         Max 3 pages

4.      Explain the ICMP.                   (8 marks)

·         Meaning – 2 lines

·         Packet format – diagram & explanation

·         Max 3 pages

5.      Explain the distance vector routing (DVR) protocol.   (10 marks)

·         Meaning – 2 lines

·         DVR – diagram (full page) & explanation.

·         Max 3 pages

6.      Explain the Link state routing (LSR) protocol.             (10 marks)

·         Meaning – 2 lines

·         LSR – diagram (full page) & explanation.

·         Max 3 pages

7.      Explain the border gateway protocol (BGP).    (6 marks)

·         Meaning

·         Diagram & explanation

·         Max 2 pages.

UNIT IV         TRANSPORT LAYER                                                                                  

1.      Explain the connection establishment in transport layer.         (8 marks)

·         Meaning – 2 lines

·         Connection establishment – data transmission - termination

·         2 way hand shaking – diagram & explanation

·         3 way handshaking - diagram & explanation

·         Max 3 pages

2.      Explain the congestion control techniques.      (16 marks)

·         Meaning – 2 lines

·         2 types – open loop methods – closed loop methods

·         Open loop methods – meaning – retransmission policy – window policy – acknowledgement policy – discarding policy – admission policy

·         Open loop methods – explanation – each 4 lines

·         Closed loop methods – meaning - back pressure – choke packet – implicit signaling – explicit signaling

·         Closed loop methods – diagram (half page ) & explanation

·         Max 5 pages

3.      Briefly explain the quality of service.              (12 marks)

·         Meaning – 2 lines

·         4 types of flow characteristics – reliability – delay – jitter – bandwidth

·         Types in table format

·         Explanation – 4 lines each

·         Max 3 pages

4.      Explain the techniques to improve QoS           (12 marks)

·         Scheduling – FIFO queuing – priority queuing – weighted fair queuing – diagram & explanation

·         Traffic shaping – leaky bucket – token bucket – diagram & explanation

·         Max 4 pages

5.      Briefly explain the UDP (user datagram protocol).      (8 marks)

·         Meaning – 2 lines

·         Well known ports – names and uses

·         User datagram – meaning – field names

·         UDP operations – connectionless services – flow and error control – encapsulation and decapsulation – queuing

·         Uses of UDP

·         Max 3 pages

6.      Briefly explain about TCP.                  (8 marks)

·         Meaning – 2 lines

·         TCP services – process to process communication – stream delivery service – full duplex communication – connection oriented service – reliable service

·         TCP segment format – diagram & explanation

7.      Explain about RTP (Real Time Transport Protocol).    (8marks)

·         Meaning – 2 lines

·         RTP packet format – diagram & explanation

·         Max 3 pages

UNIT V           APPLICATIONS                                                                                           

1.      Explain about DNS (Domain naming system). (8 marks)

·         Meaning – 2 lines

·         Name space – flat – hierarchical

·         Domain – generic – country – inverse

·         Mapping – names to address – address to names

·         Max 3 pages

2.      Explain about WWW (World wide web)          (8 marks)

·         Meaning – 2 lines

·         www architecture - Diagram & explanation

·         client – server – URL – cookies – static – dynamic – active documents

3.      explain about SNMP                (8 marks)

·         meaning – 2 lines

·         SNMP – diagram & explanation

·         Max 3 pages

4.      Explain about SMTP.               (8 marks)

·         Meaning – 2 lines

·         Diagram & explanation

·         Max 3 pages

5.      Explain about DES algorithm               (8 marks)

·         Meaning – 2 lines

·         Diagram & explanation

·         Max 3 pages

6.      Explain about RSA algorithm              ( 8 marks)

·         Meaning -2 lines

·         Diagram & explanation

·         Max 3 pages

7.      Explain about SSL (TSL).                    (8 marks)

·         Meaning – 2 lines

·         SSL functions – fragmentation – compression – message confidentiality – message integrity – framing

·         Max 3 pages

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