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VTU Electronics and Communication Engineering (Semester 7)
Computer Communication Networks
June 2012
Computer Communication Networks
June 2012
1 (a)
With a neat diagram, explain the TCP/IP reference model.
10 M
1 (b)
Explain in detail, the cable TV network used for data transfer.
6 M
1 (c)
Calculate the minimum time to download the one million bytes of information using each of the following technologies:
(i) V.32 modem
(ii) V.32 bia modem
(iii) V.90 modem
(i) V.32 modem
(ii) V.32 bia modem
(iii) V.90 modem
4 M
2 (a)
With a neat diagram of piggy backing in Go-Back-N ARQ protocol, explain the following:
(i) Frame structure of piggy backing
(ii) Types of events occurred in piggy backing
(iii) Advantages of piggy backing
(i) Frame structure of piggy backing
(ii) Types of events occurred in piggy backing
(iii) Advantages of piggy backing
10 M
2 (b)
With a neat diagram, explain the different types of high level data link control (HDLC) frames.
6 M
2 (c)
The following character encoding is used in a data link protocol:
A : 01000111 : B : 11100011 : FLAG : 01111110 : ESC = 111 00000. Show the bit sequence transmitted (in binary) for the four character frame : A B ESC FLAG when each of the following framing methods are used :
(i) Character count
(ii) FLag bytes with byte stuffing
(iii) Starting and ending flag bytes with bit stuffing
A : 01000111 : B : 11100011 : FLAG : 01111110 : ESC = 111 00000. Show the bit sequence transmitted (in binary) for the four character frame : A B ESC FLAG when each of the following framing methods are used :
(i) Character count
(ii) FLag bytes with byte stuffing
(iii) Starting and ending flag bytes with bit stuffing
4 M
3 (a)
With a suitable flow diagram, explain CSMA/CD protocol and discuss the frame transmission time.
8 M
3 (b)
Explain the following controlled access methods:
(i) Reservation
(ii) Polling
(iii) Token passing
(i) Reservation
(ii) Polling
(iii) Token passing
8 M
3 (c)
Show that the throughput for the pure ALOHA is S=Ge-2G and maximum throughput Smax=0.184.
4 M
4 (a)
With a neat diagram, explain 802.3 MAC frame format.
10 M
4 (b)
Explain the following standard ethernet physical layer implementations.
(i) 10 base 5 : thick ethernet
(ii) 10 base 2 : thin ethernet
(iii) 10 base T : twisted pair ethernet
(iv) 10 base F: fiber ethernet.
(i) 10 base 5 : thick ethernet
(ii) 10 base 2 : thin ethernet
(iii) 10 base T : twisted pair ethernet
(iv) 10 base F: fiber ethernet.
10 M
5 (a)
Explain the following in brief:
(i) Passive hubs
(ii) Active hubs
(iii) Bridges
(iv) Router
(v) Gateway.
(i) Passive hubs
(ii) Active hubs
(iii) Bridges
(iv) Router
(v) Gateway.
10 M
5 (b)
Explain virtual LAN system and how the membership is allocated in the V-LAN system.
10 M
6 (a)
What are the difference between classful and classless addressing?
5 M
6 (b)
What is network address translation (NAT)? Explain in brief.
5 M
6 (c)
Draw the IPV4 datagram formats and explain its field.
10 M
7 (a)
Explain the detail, the distance vector routing algorithm.
10 M
7 (b)
Explain three different forwarding techniques.
10 M
8 (a)
Explain in detail, user datagram protocol, UDP.
10 M
8 (b)
Describe DNS in the internet.
10 M
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