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
5981
How would QoS be used on a corporate network?
Answer:
To give video conferencing traffic priority over email traffic
This is a classic use of QoS, as video conferencing is sensitive to latency and jitter, while email is not.
5982
Which device creates a separate broadcast domain for each connected network?
Answer:
Router
Each interface on a router is in a different broadcast domain, and routers do not forward broadcasts between them.
5983
Which network device lets you share an Internet connection with other computers?
Answer:
Router
A router manages traffic between networks and allows multiple devices to share a single internet connection.
5984
Does UDP retransmit lost packets?
Answer:
No, it is a "best effort" protocol
UDP does not provide the reliability mechanisms of TCP, such as retransmission of lost packets. It is faster but less reliable.
5985
What is a "datagram"?
Answer:
Another name for a packet in a connectionless network
In the context of the IP protocol, which is connectionless, the packets are often referred to as datagrams.
5986
Which device is the most intelligent of the three (hub, switch, router)?
Answer:
Router
A router is the most intelligent as it can make complex decisions about the best path for data to travel between networks.
5987
Which switch type dedicates the full capacity of a link?
Answer:
Circuit switching
Circuit switching reserves an entire communication path for the duration of the connection.
5988
What is a key advantage of a switch over a hub?
Answer:
It reduces collisions.
By creating a separate collision domain for each port, a switch dramatically reduces the number of collisions on a network.
5989
What is a disadvantage of packet switching?
Answer:
It can have variable delays (jitter).
Because packets can take different routes and experience different levels of congestion, they can arrive with inconsistent delays, which is a problem for real-time communication.
5990
For a dial-up internet connection, what hardware must a computer have?
Answer:
Modem
A modem (modulator-demodulator) is required to convert digital computer signals to analog signals for transmission over telephone lines.