Computer Networks And Security
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2021104501
B.Tech Examination, 2021
Instructions
- The marks are indicated in the right-hand margin.
- There are NINE questions in this paper.
- Attempt FIVE questions in all.
- Question No. 1 is compulsory.
Questions
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Q1
Choose the correct answer of the following (any seven) :
a)2 marksSHA-1 produces a hash value of (i) 256 bits (ii) 160 bits (iii) 180 bits (iv) 128 bits
b)2 marksWhich of the following tasks is not done by data link layer? (i) Framing (ii) Error control (iii) Flow control (iv) Channel coding
c)2 marksWhich of the following routing algorithms can be used for network layer design? (i) Shortest path algorithm (ii) Distance vector routing (iii) Link state routing (iv) All of the above
d)2 marksThe physical layer translates logical communication requests from the ______ into hardware specific operations. (i) data link layer (ii) network layer (iii) transport layer (iv) application layer
e)2 marksWhich of the following is the type of firewall? (i) Packet filtering firewall (ii) Dual-homed gateway firewall (iii) Screened host firewall (iv) Dual-host firewall
f)2 marksIn TCP, sending and receiving data are done as (i) stream of bytes (ii) sequence of characters (iii) lines of data (iv) packets
g)2 marksIn the IPv6 header, the traffic class field is similar to which field in the IPv4 header? (i) Fragmentation field (ii) Fast-switching (iii) ToS field (iv) Option field
h)2 marksWhich of the following are transport layer protocols used in networking? (i) TCP and FTP (ii) UDP and HTTP (iii) TCP and UDP (iv) HTTP and FTP
i)2 marksAn ALOHA network uses an 18.2 kbps channel for sending message packets of 100 bits long size. Calculate the maximum throughput. (i) 5999 (ii) 6900 (iii) 6027 (iv) 5027
j)2 marksRSA stands for (i) Rivest-Shamir-Adleman (ii) Roger-Shamir-Adrian (iii) Robert-Shamir-Anthoney (iv) Rivest-Shaw-Adleman
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Q2
What is TCP/IP model? Explain the functions, protocols and services of each layer. Compare it with OSI model.
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Q3
What are Hamming distance and Hamming code? Explain with an example.
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Q4
Differentiate between classful and classless IP addressing. Subnet the IP address 203.10.93.0/24 into 30 subnets. Is 203.10.93.30 a valid host ID after subnetting?
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Q5
Differentiate between OSPF and RIP protocols with an example.
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Q6
Discuss flow and error control protocols of transport layer. In the stop-and-wait protocol, show the case in which the receiver receives a duplicate packet (which is also out of order) Hint : Think about a delayed ACK. What is the reaction of the receiver to this event?
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Q7
Write short notes on the following : (a) HTTP (b) FTP (c) DNS (d) TELNET
a)3 marksHTTP
b)3 marksFTP
c)3 marksDNS
d)3 marksTELNET
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Q8
How is security provided by SSL? What services are provided by the SSL Record Protocol? What steps are involved in the SSL Record Protocol transmission?
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Q9
Differentiate between symmetric key crypto-system and asymmetric key cryptosystem. Explain RSA algorithm in detail with an example.
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