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
6031
What is the main purpose of a packet's Time To Live (TTL) field?
Answer:
To prevent packets from circulating indefinitely in the network
The TTL is a value that is decremented by each router. If it reaches zero, the packet is discarded, which prevents routing loops from consuming all network resources.
6032
Which device operates at the Network layer (Layer 3) of the OSI model?
Answer:
Router
A router operates at the Network layer and uses IP addresses to forward data between different networks.
6033
Which device is a "dumb" device that doesn't make any decisions?
Answer:
Hub
A hub simply repeats signals without any intelligence or decision-making.
6034
Which network requires each device to have a Network Interface Card (NIC)?
Answer:
?
All devices that connect to a network, whether wired or wireless, need a NIC (or a wireless adapter) to handle the communication.
6035
Which of these is an example of circuit switching?
Answer:
Making a traditional landline phone call
The old telephone system works by creating a dedicated, end-to-end circuit for the duration of the call.
6036
Which model is more suitable for applications that require high security and control?
Answer:
Client-server model
The centralized control of the client-server model is essential for applications that handle sensitive data, like banking or e-commerce.
6037
What is a major disadvantage of the peer-to-peer model?
Answer:
Data backup and recovery are difficult.
Because data is stored on individual computers, there is no central backup, making data management and recovery a challenge.
6038
What is "wardriving"?
Answer:
Driving around looking for open and insecure Wi-Fi networks
Wardriving is the act of searching for Wi-Fi networks from a moving vehicle.
6039
Which network type would be used to connect the different branches of a bank in a city?
Answer:
MAN
A MAN would be the most appropriate choice to connect multiple bank branches within the same city, as it is designed for this scale of networking.
6040
Which device would you use to extend the range of a wireless network?
Answer:
A wireless repeater or extender
A wireless repeater is a device that takes an existing wireless signal and rebroadcasts it to extend its range.