STUPIDSID
Answer Briefly (any four)
1 (a)
What is meant by data transparency? How is it implemented in HDLC protocol?
5 M
1 (b)
What is the difference between congestion control and flow control?
5 M
1 (c)
Explain various network topologies
5 M
1 (d)
Compare OSI model with TCP/IP model.
5 M
1 (e)
List and explain the functions of data link layer.
5 M
2 (a)
Explain OSI reference model architecture for a network with two intermediate nodes and a neat diagram. Also explain the functions of each layer. Name the layer responsible for
i. End to end reliability
ii. Link to link reliability
i. End to end reliability
ii. Link to link reliability
8 M
2 (b)
What is meant by flow control? Discuss the different flow control methods with neat diagram.
8 M
2 (c)
Explain different ARQ techniques.
4 M
3 (a)
Explain ADSL with respect to channel configuration and modulation technique.
8 M
3 (b)
What are transmission impairments? Explain.Compare co-axial cable, optical fiber cable with respect to transmission characteristics, data rate, applications and bandwidth.
8 M
3 (c)
List the categories of UTP cables. How is noise ? interference minimized in twisted pair cables.
4 M
4 (a)
With respect to HDLC protocol, explain the following:-
i. HDLC frame format.
ii. Different HDLC frames.
iii. Data transfer modes.
iv. Balanced and unbalanced configurations.
v. Importance of P/F bit.
vi. "Polling" Technique and ?Select? routine.
vii. Flow control and error control commands.
i. HDLC frame format.
ii. Different HDLC frames.
iii. Data transfer modes.
iv. Balanced and unbalanced configurations.
v. Importance of P/F bit.
vi. "Polling" Technique and ?Select? routine.
vii. Flow control and error control commands.
10 M
4 (b)
Sketch the appropriate HDLC frames for the following cenario involving primary station 'A' and two Secondary station B and C.
(i) Primary station 'A' wishes to establish a Normal Respose mode-link with secondary station B and C.
(ii) Both the station B and C, send psitive acknowledgements to A.
(iii) Station 'A' sends a polling command to 'B' and 'B' sends 3 data frames. A sends a positive-Ack to indicates the receipt of error-free data frames.
(iv) Station 'A' sends a 'Select' command to 'C'. When 'C' responds with 'ready' response , 'A' sends 3 data frames to C and C sends positive Ack to indicate the receipt of error-free data frames.
(v) What is the Piggybacking ? Give an example of piggybacked frame.
(i) Primary station 'A' wishes to establish a Normal Respose mode-link with secondary station B and C.
(ii) Both the station B and C, send psitive acknowledgements to A.
(iii) Station 'A' sends a polling command to 'B' and 'B' sends 3 data frames. A sends a positive-Ack to indicates the receipt of error-free data frames.
(iv) Station 'A' sends a 'Select' command to 'C'. When 'C' responds with 'ready' response , 'A' sends 3 data frames to C and C sends positive Ack to indicate the receipt of error-free data frames.
(v) What is the Piggybacking ? Give an example of piggybacked frame.
10 M
5 (a)
What is meant by 'blocking' in space-div -switching ?
(i) Derive the condition required to make 3-stage space-div-switch to be a non-blocking switch. (4m)
(ii) Sketch a 3 stage space-div-switch and TST switch with N=16, n=4 and K=3. (6m)
(iii) Show how blocking occurs in the above 3 stage space-div-switch diagram. (2m)
(i) Derive the condition required to make 3-stage space-div-switch to be a non-blocking switch. (4m)
(ii) Sketch a 3 stage space-div-switch and TST switch with N=16, n=4 and K=3. (6m)
(iii) Show how blocking occurs in the above 3 stage space-div-switch diagram. (2m)
12 M
5 (b)
Draw a diagram of packet-switched network and explain how virtual -circuit packet switching works. And compare circuit-switching, datagram switching and virtual circuit packet switching.
8 M
6 (a)
Apply Dijkstra's and Bellman ford Routing algorithms to the given network and find the least cost path from source node-1 to all the nodes.
12 M
6 (b)
Explain LAN protocol architecture with IEEE 802 reference. Sketch the general MAC frame format and LLC PDU structure. Explain the functions of different fields.
8 M
7 (a)
Explain the functions of different connecting devices Routers, bridges, Repeaters and Switches.
8 M
7 (b)
Write short notes:
i. ISDN
ii. Congestion control Techniques.
iii. Spanning tree algorithm
iv. Token re-insertion strategies.
v. Routing strategies for Packet switching.
i. ISDN
ii. Congestion control Techniques.
iii. Spanning tree algorithm
iv. Token re-insertion strategies.
v. Routing strategies for Packet switching.
12 M
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