Download AKTU B-Tech 6th Sem 2015-2016 ECS 601NCS Computer Networks Question Paper

ECS-601/NCS-601

(Following Paper ID and Roll No. to be filled in your Answer Books)

Paper ID: 110601

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Roll No.

B.TECH.

Theory Examination (Semester-VI) 2015-16

COMPUTER NETWORKS

Time: 3 Hours

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Max. Marks : 100

Note: Attempt questions from all Sections as per directions.

Section-A

Attempt all parts of this section. Answer in brief.

(2×10=20)

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1. (a) Given the IP address 180.25.21.172 and the subnet mask 255.255.192.0, what is the subnet address?
2. (b) What is count-to-infinity problem?
3. (c) The filters used in telephony end offices limit high frequency components on telephone lines. What is its cut-off frequency when ADSL modems are used on customer lines?
4. (d) Explain TCP congestion control algorithm in internet. What is TCP segment header? Also discuss TCP connection management.
5. (e) What is the total delay (latency) for a frame size of 10 million bits that is being set up on link with 15 routers, each having queuing time of 2us and a processing time of 1 us? The length of link is 3000km. The speed of light inside the link is 2×10⁸ m/sec. The link has bandwidth of 6Mbps.

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6. (f) What is OSI Model? Explain the functions and protocols and services of each layer?
7. (g) What is IP addressing? How it is classified? How is subnet addressing is performed?
8. (h) A typical socket-server application responds user requests using TCP over a specified port. What is the typical sequence in terms of socket functions on server side?
9. (i) How many layers are there in X.25 protocol? Enlist the layers.
10. (j) Define routing. In what way it is different from switching? What are the applications of Computer Networks? Give an example of packet Meta data.

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Section-B

Attempt any five questions from this section. (10×5=50)

1. A rectangular wave-guide (a = 2 cm b = 1 cm) filled with de-ionized water (µ=1, ? = 81) operates at 3 GHz. Determine all propagating modes and corresponding cut-off frequencies.

Section-C

Attempt any two questions from this section. (15×2=30)

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1. (i) If fragmentation needed in concatenated virtual circuit internets or only in datagram systems? Explain. (ii) What is hamming code? Explain its working with suitable example.
2. Answer each question:
   1. Find the class of each address
      1. 140.213.10.80
      2. 52.15.150.11
   2. What is the type of the following address?
      1. 4F::A234:2

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      2. 52F::1234:2222
   3. What is congestion? Name the techniques that prevent congestion.
3. Write short notes on any three of the following:
   1. DNS in the internet

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   2. Voice Over IP
   3. SNMP
   4. Electronic mail
   5. File Transfer Protocol

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