NPTEL Computer Networks And Internet Protocol Week 12 Assignment Answers 2025
1. In which layer of the OSI model does the HTTP (Hypertext Transfer Protocol) operate?
a) Transport Layer
b)Network Layer
c) Application Laye
d) Data Link Layer
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2. Which of the following best describes “Manchester Encoding”?
a) A method that encodes data using transitions at the beginning of each bit period.
b) A self-clocking encoding technique with a transition in the middle of each bit period.
c) A signaling method that uses voltage levels directly to represent ls and Os.
d) An encoding technique that combines multiple signals into one.
Answer :-
3. Atime-division multiplexing (TDM) link transmits 4,000 frames per second, with each time slot containing 8 bits. What is the transmission rate of this TDM circuit
a) 32kbps
b) 500bps
c) 500kbps
d) 32bps
Answer :-
4. What is the main difference between Manchester and Differential Manchester encoding?
a) Differential Manchester requires more bandwidth
b) Differential Manchester uses a transition for every 1-bit
c) Manchester encoding has no transitions at all
d) Manchester encoding is only used in analog signals
Answer :-
5. In Phase Shift Keying (PSK), how is information transmitted?
a) By varying the frequency of the carrier signal
b) By varying the amplitude of the carrier signal
c) By varying the phase of the carrier signal
d) By varying both amplitude and phase of the carrier signal
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6. A channel has a capacity of 1 Mbps and an SNR of 9. If the SNR is halved, what happens to the
channel capacity?
a) It remains the same.
b) It is reduced by exactly 50%.
c) It is reduced by less than 50%.
d) It is reduced to zero.
Answer :-
7. What is the primary limitation of NRZ-L when used over long distances?
a) Increased signal distortion at high frequencies.
b) Difficulty in handling multiple voltage levels.
c) Poor synchronization for long sequences of 0s or 1s.
d) Requires higher power for transmission.
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8. Which of the following firewalls offers the highest level of security?
a) Packet-filtering firewall
b) Stateful firewall
c) Proxy firewall
d) NAT firewall
Answer :-
9. Which of the following firewalls offers the highest level of security?
a) Packet-filtering firewall
b) Stateful firewall
c) Proxy firewall
d) NAT firewall
Answer :-
10. A firewall rule that permits outgoing HTTP traffic but denies all incoming traffic except fo
established connections operates under which principle
a) Default allow
b) Default deny
c) Least privilege
d) Fail-safe defaults
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