Computer Science/IT MCQs
Topic Notes: Computer Science/IT
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
Which layer is responsible for congestion control?
Answer:
Network layer
Congestion control, which manages traffic to prevent network overload, is a key function of the Network Layer.
2
The first layer of the OSI reference model is:
Answer:
Physical
Layer 1, the Physical layer, is responsible for the transmission and reception of raw bit streams over a physical medium.
3
Which networking device operates at the physical layer?
Answer:
Repeater
A repeater operates at the Physical Layer (Layer 1) of the OSI model. Its primary function is to regenerate and amplify the electrical signal to extend the distance a network signal can travel over a physical medium, without inspecting the data it is forwarding.
4
Which OSI model layer is identified as layer one?
Answer:
Physical layer
The physical layer is responsible for the transmission of raw data bits.
5
At which OSI layer does encryption and decryption occur?
Answer:
Presentation layer
The presentation layer is responsible for data encryption, decryption, and formatting.
6
In OSI architecture, which layer handles dialogue control and token management?
Answer:
Session layer
The session layer establishes, manages, and terminates sessions between applications.
7
How many total layers are in the OSI model?
Answer:
Seven
The OSI (Open Systems Interconnection) model includes seven layers that define networking functions from hardware to software.
8
What does the letter 'S' represent in OSI?
Answer:
System
OSI stands for Open Systems Interconnection, where "Systems" reflects the focus on interconnected computing platforms.
9
Which OSI layer is tasked with routing?
Answer:
Network layer
The network layer determines optimal routing paths across the network.
10
What is the length of an ATM cell?
Answer:
53 bytes
An Asynchronous Transfer Mode (ATM) cell is a fixed-length packet consisting of a 5-byte header and a 48-byte payload.