Explanation

• A firewall’s main function is to prevent or block unauthorized access to a computer network.
• It acts as a security barrier between trusted and untrusted networks (like the internet).
• It filters incoming and outgoing network traffic based on security rules.
• It helps protect systems from hackers and unwanted access attempts.

Last verified on 10-06-2026

Explanation

• DHCP automatically assigns IP addresses to devices.
• It also provides subnet mask, gateway, and DNS information.
• DHCP stands for Dynamic Host Configuration Protocol.

Last verified on 15-01-2026

Explanation

• A Stack follows the LIFO (Last In, First Out) principle.
• The last element added to the stack is the first one to be removed.
• Elements are inserted using Push and removed using Pop operations.
• Stacks are commonly used in function calls and expression evaluation.
• It is a linear data structure.

Last verified on 10-06-2026

Explanation

• A macro is an automated sequence of commands used to perform repetitive tasks quickly in software applications.
• It saves time by executing multiple steps with a single command.
• Commonly used in MS Word, Excel, and other office software.
• It can be recorded or programmed by the user.

Last verified on 21-06-2026

Explanation

• ROM (Read Only Memory) is a non-volatile storage device.
• It stores data permanently even without power.

Additional information:

• RAM (Random Access Memory) is a volatile storage device.
• It loses data when power is off.

Last verified on 17-06-2026

Explanation

• Quick Sort is the fastest in the average case among the given options.
• It has an average time complexity of O(n log n).
• It uses a divide-and-conquer strategy to sort data efficiently.

Last verified on 23-06-2026

Explanation

• Stack is used for recursion.
• Because it stores function calls in LIFO order during execution.
• Recursion works by repeatedly calling the same function.
• Each call is stored in memory until it completes execution.

Last verified on 08-06-2026

Explanation

• The Input Unit takes data and instructions from the user.
• Examples include keyboard, mouse, scanner.
• It sends the data to the CPU for processing.

Last verified on 25-05-2026

Explanation

• The Control Unit (CU) is part of the CPU.
• It interprets instructions from memory.
• It directs and coordinates all computer operations.
• It acts like the “brain controller” of the computer system.

Last verified on 24-05-2026

Explanation

• The ALU (Arithmetic Logic Unit) is the core component of the CPU.
• It performs both arithmetic operations (calculations) and logical operations (comparisons).
• Without ALU, a computer cannot process data.
• ALU works together with the Control Unit (CU).

Last verified on 06-05-2026