Computer Science for IGCSE & O level - Data Transmission (Section 6)
1
Which of these methods require a round-trip of data?
პასუხი
B
D
2
What kind of information are used to generate a check digit?
პასუხი
B
C
D
3
What is the purpose of a 'proxy server'?
პასუხი
(B)
To filter and cache network traffic.
4
Which of the following are examples of network security threats?
პასუხი
A
B
C
5
In the context of asymmetric encryption, who is the sender?
პასუხი
(A)
The follower
6
What is the function of 'segmentation' in data transmission?
პასუხი
(B)
To divide data into smaller, manageable units for transmission.
7
Which is used to identify the errors in data entry?
პასუხი
(B)
Check digits
8
How do echo checks identify errors?
პასუხი
(A)
By sending the data back to the sender.
9
Which of the following are examples of wired network technologies?
პასუხი
A
C
10
What is 'social engineering'?
პასუხი
(B)
The practice of manipulating people to gain information.
11
What distinguishes a full-duplex communication mode?
პასუხი
(B)
Data is sent in both directions simultaneously.
12
Which of the following is NOT a component of a typical packet header?
პასუხი
(C)
The payload.
13
What is the role of a private key in asymmetric encryption?
პასუხი
(C)
Decrypt data that was encrypted with the corresponding public key.
14
What are the common causes of data corruption during transmission?
პასუხი
A
B
C
15
Which of the following is the biggest disadvantage of using asymmetric encryption?
პასუხი
(A)
It is very complex and time-consuming
16
Which of the following is considered a 'layer 1' protocol in the OSI model?
პასუხი
(D)
The physical layer
17
What does the term 'firewall' primarily do in terms of network security?
პასუხი
(B)
Filters network traffic based on predefined rules.
18
What does full-duplex communication allow?
პასუხი
(B)
Data to be sent in both directions simultaneously.
19
What is the purpose of error-checking methods such as checksums and parity bits?
პასუხი
A
C
20
How does 'red-time streaming' relate to packet switching?
პასუხი
(A)
It increases the likelihood of packets getting reordered.
21
What are the key characteristics of serial data transmission?
პასუხი
(A)
Sends bits one at a time over a single channel.
22
What is the role of a sequence number in the packet header?
პასუხი
(B)
To reassemble packets in the correct order.
23
What type of data transmission is commonly used for longer distances?
პასუხი
(C)
Serial
24
Which type of data transmission is usually preferred for long distances?
პასუხი
(B)
Serial data transmission.
25
In the context of ISBN-13 calculation, which operation is used to calculate the check digit?
პასუხი
(B)
Modulo
26
What is the main advantage of asymmetric encryption over symmetric encryption?
პასუხი
(C)
Higher data security
27
What is an example of "plaintext"?
პასუხი
(D)
An email's body before encryption
28
What is the main limitation of using parity checks for error detection?
პასუხი
(A)
It can only detect single-bit errors.
29
What is a key advantage of using packet switching in a network?
პასუხი
(B)
More efficient use of network resources.
30
Which of the following are types of error detection techniques?
პასუხი
A
B
31
What are the benefits of using a USB system?
პასუხი
A
B
C
32
What is the function of the 'sequence number' in a packet's header?
პასუხი
(C)
To help reassemble packets in the correct order.
33
What is the role of the 'payload' in a data packet?
პასუხი
(B)
To contain the actual data being transmitted.
34
How does half-duplex data transmission work?
პასუხი
(B)
Data is sent in one direction at a time.
35
Which of the following uses an excluded value which is a result after blocks of data, the receiving computer also calculates the value from the blocks of data and compares the values?
პასუხი
(C)
Checksum
36
Which layer of the OSI model is responsible for formatting the data before transmission?
პასუხი
(A)
The Presentation Layer
37
What can cause data corruption during transmission?
პასუხი
A
C
38
Which type of transmission mode allows for sending data in only one direction?
პასუხი
(C)
Simplex
39
In the context of data security, what does "encryption" achieve?
პასუხი
(B)
Protects data by converting it into an unreadable format.
40
What is the primary purpose of the OSI model?
პასუხი
(B)
To provide a framework for understanding how networks operate.
41
Which of the following scenarios would be most likely to cause an error detectable by a parity check?
პასუხი
(A)
A single bit is flipped during transmission.
42
What is 'malware'?
პასუხი
(B)
Software designed to damage or disrupt a computer system.
43
What is the primary goal of using error detection methods in data transmission?
პასუხი
(C)
To identify and handle transmission errors.
44
What is a primary advantage of asymmetric encryption?
პასუხი
(B)
Simplified key exchange.
45
Which mode enables two-way communication at the same time?
პასუხი
(C)
Full-duplex
46
Which of the following is true about the security of symmetric encryption?
პასუხი
(A)
The key must be kept secret.
47
What type of error detection involves sending data twice and comparing the two instances?
პასუხი
(C)
Repetition
48
What are the possible causes of data corruption during data transmission?
პასუხი
A
B
C
49
What is the result of the ISBN-13 calculation for the number 978030640615X (where X represents the check digit)?
პასუხი
(C)
2
50
What is the role of 'authentication' in data security?
