Computer Science for IGCSE & O level - Data Transmission (Section 3)
1
What happens if the computer can't find the driver software when a new device is plugged into a USB port?
Одговорити(A)
The user is prompted to download the appropriate driver software.
2
What is the main characteristic of full-duplex data transmission?
Одговорити(C)
Data is sent in both directions simultaneously.
3
What kind of key is used for encrypting a document, so that it can only be decrypted by a person who knows the corresponding key?
4
What is the purpose of the 'IP address' in a network?
Одговорити(A)
To uniquely identify a device on a network.
5
Which of the following is/are features of serial data transmission?
6
What is the main function of the network layer in the OSI model?
7
In which error-detection method is the data sent back to the sender to check for any kind of error?
8
In the context of a USB connection, what happens automatically when a new device is plugged in?
Одговорити(B)
The USB device is automatically detected, and the appropriate device drivers are installed.
9
What is the main advantage of using a USB connection?
Одговорити(A)
Faster data transfer speeds.
10
What is the purpose of the packet trailer?
Одговорити(B)
To identify the end of the packet.
11
What is the main goal of a security protocol?
Одговорити(C)
Ensure the privacy, authenticity, and integrity of data.
12
Which of the following are methods of error detection?
13
What is the primary method to detect an error during the transmission?
14
What is the role of a 'router' in a home network?
Одговорити(B)
To connect devices to the internet and manage network traffic.
15
What is a potential drawback of using echo checks?
Одговорити(C)
They can increase transmission time.
16
What are the key elements in a typical ARQ system?
17
Which protocol is used for transferring files?
18
What best describes the function of an 'Intrusion Detection System (IDS)'?
Одговорити(B)
To detect malicious activity and log security events.
19
What is the primary function of a "modem"?
Одговорити(C)
To convert digital signals to analog signals and vice versa.
20
What is the purpose of a "timeout" in the context of automatic repeat request (ARQ)?
Одговорити(B)
To automatically retransmit data if an acknowledgement isn't received.
21
In a network, what function does a router mainly perform?
Одговорити(A)
Sends data packets to the correct destination.
22
What does the term 'encryption key' refer to?
Одговорити(B)
The secret code used to encrypt or decrypt data.
23
In the context of a network, what does the term 'node' usually represent?
Одговорити(A)
A device that forwards packets.
24
What mode of data transmission permits simultaneous sending and receiving of data?
25
How is the check digit calculated in the ISBN-13 system?
Одговорити(B)
By using a modulo 10 operation on a weighted sum of the first 12 digits.
26
In the context of data transmission, what does the term 'bandwidth' refer to?
Одговорити(B)
The amount of data that can be transmitted over a network in a given time.
27
What is the relationship between the public and private keys in asymmetric encryption?
Одговорити(B)
One is used to encrypt and the other to decrypt.
28
Which component identifies the final destination of each data packet?
Одговорити(B)
The IP address in the header
29
What does the 'Presentation Layer' do in the OSI Model?
Одговорити(C)
Formats and encrypts data.
30
What type of data transmission does USB-C support?
31
What does the abbreviation 'TCP' stand for?
Одговорити(A)
Transmission Control Protocol
32
In which transmission mode can data be sent in one direction only?
33
If data is sent simultaneously in both directions, it's an example of:
34
What is a 'router' mainly responsible for?
Одговорити(C)
Connecting multiple networks and forwarding data packets between them.
35
What is the primary function of a network 'switch'?
Одговорити(B)
To intelligently forward data to the destination device only.
36
In the context of data transmission, which of the following best describes the concept of an "Automatic Repeat Request (ARQ)"?
Одговорити(C)
A method to request the retransmission of data if an error is detected.
37
What is the primary function of the parity bit in data transmission?
Одговорити(B)
To detect errors in the data.
38
What is the difference between a 'bridge' and a 'router'?
Одговорити(A)
A bridge connects networks; a router forwards data between networks using IP addresses.
39
What is the primary goal of a 'man-in-the-middle' (MITM) attack?
Одговорити(B)
To intercept and potentially alter communications between two parties without their knowledge.
40
Which component is used for digital signature in a asymmetric encryption?
41
What is a possible disadvantage of implementing a checksum in data transmission?
Одговорити(A)
Increased processing overhead for both the sender and the receiver.
42
What does "full-duplex" data transmission enable?
Одговорити(B)
Data transmission in both directions simultaneously.
43
What does the acronym 'ARQ' stand for?
44
What is the meaning of the acronym 'HTTPS'?
Одговорити(A)
HyperText Transfer Protocol Secure
45
What distinguishes serial data transmission?
Одговорити(B)
Bits are sent one after another over a single channel.
46
What is a 'cookie' in the context of web browsing?
Одговорити(A)
A small text file stored on a user's computer by a website.
47
What is the difference between the "plaintext" and "ciphertext" in encryption?
Одговорити(A)
Plaintext is the original data, and ciphertext is the encrypted data.
48
What is the function of the 'payload' section within a data packet?
Одговорити(B)
To contain the actual data being transmitted.
49
In packet switching, what determines the route of the packets?
Одговорити(B)
The destination IP address
50
How does the hop number of a packet change as it travels through a network?
Одговорити(C)
It is decremented at each hop.
