EOU Assessment: 3.2 Data Transmission and Security

1. Fill in the Blanks

Word Bank: Packet Switching, Echo Check, Firewall, Virus, Spyware, Quarantine

a. Breaking down messages into small units that travel independently across a network to be reassembled at the destination is known as

b. An error-detection technique where the receiving device transmits received data back to the original sender to verify accuracy is called an

c. A digital security barrier that monitors and filters network traffic based on predefined security rules is called a

d. Malicious software designed to secretly record user activities such as keystrokes and passwords without consent is known as

e. When antivirus software detects an infected file, it can move it to a safe, isolated area on the computer called to prevent it from corrupting other data.

2. Multiple Choice Questions

a. Which physical factors during transmission can cause bit errors in data packets traveling across a network?

A) Keyboard typing speed and monitor resolution

B) Electrical surges, radio wave interference, and crosstalk

C) High bandwidth connections and optic fiber lines

D) Low disk storage space and screen brightness

b. What action does an echo check protocol take immediately after the sending device receives the returned data copy from the receiving device?

A) It deletes the original file permanently

B) It shuts down the network connection

C) It compares the echoed copy with the original data to check for differences

D) It encrypts the hard drive storage automatically

c. A school network uses a hardware-based firewall between its internal LAN (Local Area Network) and the public Internet. What is the primary function of this hardware device?

A) To physically speed up the internet bandwidth across classrooms

B) To act as a centralized physical barrier that checks and blocks unauthorized external traffic before it enters the school network

C) To automatically scan individual files for keyloggers on student laptops

D) To automatically re-send missing packets during file downloads

d. Which type of malware specifically requires a host software file or program to attach itself to in order to multiply and corrupt data?

A) Software Firewall

B) Echo check protocol

C) Computer virus

D) Hardware network switch

e. A student downloads an image file from the web. Which utility tool actively checks this file during download to verify it does not contain code designed to damage or alter data?

A) Echo checker

B) Antivirus software

C) Network adapter

D) Antispyware ruleset

f. How does a software firewall differ from an antivirus program installed on the same computer?

A) A firewall checks data traffic entering/leaving through network ports, whereas an antivirus scans stored files and downloads for malicious code.

B) A firewall cleans viruses from USB drives, whereas antivirus monitors network cables.

C) A firewall repairs corrupted operating system files, whereas antivirus blocks internet connections completely.

D) There is no functional difference; both tools perform identical tasks.

3. One-Word Answers

a. The general term for any malicious software designed to disrupt, damage, or gain unauthorized access to computer systems:

b. The device or system that initiates data transmission across a network:

c. The target device or system that receives transmitted data across a network:

d. A security tool designed specifically to detect, block, and remove hidden keystroke loggers and hidden monitoring software:

4. Match the Following

Drag the correct option letter from the pool on the right into the corresponding concept slot on the left.

1. Hardware Firewall

Drop matching letter here

2. Echo Check Scenario

Drop matching letter here

3. Computer Virus

Drop matching letter here

4. Spyware

Drop matching letter here

Options Bank

A. Bouncing a transmitted message back across a noisy street to verify every spoken digit.

B. A physical security gate standing between a corporate building and the public street, filtering all entry.

C. A hidden background program logging a user's bank password inputs to send to cybercriminals.

D. Destructive code embedded inside a downloaded game file that corrupts system storage files.

5. Arrange in Proper Sequence

Order the steps logically by numbering them (1 to 5).

Sequence A: The Echo Check Transmission Protocol

The sending device compares the echoed data copy against its original file.

The receiving device sends an exact copy of the received data back to the sender.

The sender transmits data packets across the network to the receiving device.

If the data matches, transmission succeeds; if a mismatch occurs, the sender re-transmits the data packet.

Data arrives at the receiving device.

Sequence B: Antivirus Scanning & Quarantine Workflow

The user downloads or opens a file on their device.

The file is placed into quarantine to isolate it from the rest of the system.

Antivirus software scans the file and detects malicious code.

The user reviews the quarantined file and permanently deletes it.

6. True or False

State whether each statement is True or False. For every False statement, write a 1-sentence correction.

a. An echo check guarantees that data cannot be intercepted or stolen by cybercriminals while traveling across a network.

True False

b. Software firewalls are installed on individual devices to monitor and filter incoming and outgoing traffic for that specific computer.

True False

c. Computer viruses and spyware function identically and perform the exact same damage to a system.

True False

d. Electrical surges and radio wave interference are physical causes of data transmission errors in network hardware.

True False

e. Moving an infected file to quarantine allows the virus to continue altering other operational files on the system.

True False

f. Packet switching breaks long computer messages into smaller data chunks containing destination addresses and payload data.

True False

7. Short Recall Lists

a. List three distinct physical or environmental causes of data corruption during network transmission.

b. List two distinct protective functions performed by antivirus software when managing file security.

Student Details

1. Fill in the Blanks

2. Multiple Choice Questions

3. One-Word Answers

4. Match the Following

Options Bank

5. Arrange in Proper Sequence

6. True or False

7. Short Recall Lists