1. Give the correct answer of these mcq’s
The checksum of 1111 and 1111 is
O 0000
O 0111
O 1110
O 1111
2. Firewall examines each that are entering or leaving the internal network.
O emails users
O updates
O connections
O data packets
The correct answer and explanation is:
1. The checksum of 1111 and 1111 is:
✅ 1110
Explanation:
A checksum is a method used for error detection in digital data transmission. It ensures data integrity by summing up binary values and sometimes using one’s complement or modulo arithmetic.
For this problem, let’s compute the binary sum of 1111 and 1111:
- Binary Addition:
1111 + 1111 -------- 11110 - Since the result is 5 bits, and standard checksums work within 4-bit limits, the extra carry bit (1) is wrapped around and added back to the result.
- Wrap-around addition:
11110 (5-bit result) → Carry 1 is added back to the remaining 4-bit value **1110** - Final Checksum: 1110 ✅
2. Firewall examines each that are entering or leaving the internal network:
✅ Data Packets
Explanation:
A firewall is a security system designed to monitor and control incoming and outgoing network traffic based on security rules. It acts as a barrier between a trusted internal network (like a company’s LAN) and untrusted external networks (such as the Internet).
A firewall works by inspecting data packets, which are small units of data that computers use for communication.
Why not the other options?
- Emails Users ❌ → Firewalls don’t inspect specific users but rather network traffic.
- Updates ❌ → Firewalls don’t directly inspect software updates; they monitor data transmission.
- Connections ❌ → While firewalls track connections, they inspect individual data packets that form those connections.
Thus, the correct answer is “Data Packets.” ✅