WorksheetsDCCN-Chapt-1
Total questions: 60
Worksheet time: 45mins
Name
Class
Date
1.
What is the definition of data communication?
a)
Exchange of data between devices via a medium
b)
Exchange of voice signals only
c)
Communication between people
d)
Sharing of hardware resources
2.
What is an example of remote communication?
a)
Face-to-face interaction
b)
Writing a note
c)
Speaking in person
d)
Video call over the Internet
3.
Which characteristic ensures data must reach the correct destination?
a)
Timeliness
b)
Delivery
c)
Accuracy
d)
Jitter
4.
What does jitter refer to in data communication?
a)
Speed of data transmission
b)
Loss of data during transmission
c)
Variation in packet arrival time
d)
Size of transmitted data
5.
What type of communication does a keyboard to monitor represent?
a)
Full-Duplex
b)
Broadcast
c)
Simplex
d)
Half-Duplex
6.
In which communication mode do devices take turns transmitting and receiving?
a)
Full-Duplex
b)
Half-Duplex
c)
Simplex
d)
Broadcast
7.
What was the first network developed by ARPA in 1969?
a)
TCP/IP
b)
ARPANET
c)
Internet
d)
Ethernet
8.
What protocol is used for transferring files between devices?
a)
FTP
b)
DNS
c)
SMTP
d)
HTTP
9.
What does DNS stand for?
a)
Domain Name System
b)
Domain Name Service
c)
Data Name System
d)
Digital Network Service
10.
What is an example of unicast communication?
a)
Sending an email to one person
b)
Broadcasting a TV signal
c)
Streaming video to multiple users
d)
File sharing with a group
11.
Which of the following is a networking device?
a)
Router
b)
Computer
c)
Printer
d)
Smartwatch
12.
What is the primary purpose of protocols in networking?
a)
Ensure accurate data transmission
b)
Increase bandwidth
c)
Establish physical connections
d)
Reduce latency
13.
Which model involves clients requesting services from servers?
a)
OSI Model
b)
Client-Server
c)
Peer-to-Peer
d)
Protocol Suite
14.
What is the full form of TCP?
a)
Transmission Communication Protocol
b)
Transmission Control Protocol
c)
Transfer Control Protocol
d)
Transfer Communication Protocol
15.
What does the bandwidth of a link represent?
a)
The time it takes for data to travel from the source to the destination
b)
The actual amount of data currently being transmitted
c)
The number of devices that can use the link simultaneously
d)
The maximum amount of data that can be transmitted over the link in a given period
16.
Which of the following is an example of analog transmission?
a)
Data transfer between computers
b)
Radio or television broadcasting
c)
USB communication
d)
Ethernet communication
17.
In simplex mode, data flows:
a)
In both directions simultaneously
b)
In only one direction
c)
In both directions, but only one at a time
d)
Randomly based on the device configuration
18.
Which data transmission technique is suitable for long-distance communication?
a)
Parallel transmission
b)
Serial transmission
c)
Twisted-pair cable
d)
Asynchronous transmission
19.
Which mode of data transmission is used in telephone communication?
a)
Simplex
b)
Half-Duplex
c)
Full-Duplex
d)
Parallel transmission
20.
What is the key feature of synchronous transmission?
a)
Data is sent one character at a time
b)
Timing is managed using start and stop bits
c)
Data is sent as large blocks, synchronized by a clock
d)
Data transfer is intermittent and unstructured
21.
Which topology has a central hub that connects all devices?
a)
Mesh topology
b)
Ring topology
c)
Star topology
d)
Bus topology
22.
Which transmission medium provides the highest bandwidth and lowest attenuation?
a)
Coaxial cable
b)
Twisted-pair cable
c)
Fiber-optic cable
d)
Radio waves
23.
What is a disadvantage of a bus topology?
a)
Requires more cabling than other topologies
b)
Performance degrades as more devices are added
c)
Failure of a single device disrupts the network
d)
Difficult to manage and troubleshoot
24.
In which type of network are devices connected in a closed loop, and data flows in a single direction?
a)
Star topology
b)
Ring topology
c)
Mesh topology
d)
Bus topology
25.
Which guided medium is lightweight and economical but more susceptible to noise?
a)
Shielded twisted-pair cable
b)
Unshielded twisted-pair cable
c)
Fiber-optic cable
d)
Coaxial cable
26.
What is the frequency range of microwaves used in communication?
a)
1 GHz to 300 GHz
b)
3 kHz to 1 GHz
c)
300 GHz to 400 THz
d)
3 kHz to 900 THz
27.
What type of network typically connects devices within a single office, building, or campus?
a)
Wide Area Network (WAN)
b)
Local Area Network (LAN)
c)
Internetwork (Internet)
d)
Switched WAN
28.
Which wireless communication medium has the lowest frequency range and can penetrate walls?
a)
Infrared waves
b)
Microwaves
c)
Radio waves
d)
Fiber-optic signals
29.
Which topology is the most fault-tolerant but expensive due to its many cables and ports?
a)
Star topology
b)
Bus topology
c)
Mesh topology
d)
Ring topology
30.
What is a key disadvantage of asynchronous transmission?
a)
Requires expensive synchronization hardware
b)
Slower transmission due to start/stop bits
c)
Complex data management
d)
Unsuitable for low-speed communication
31.
What is the primary feature of guided media?
a)
Signals are broadcast in all directions
b)
Signals are directed and contained within a medium
c)
Requires no physical connection between devices
d)
Uses free space for signal transmission
32.
What is the key purpose of switching in networks?
a)
To reduce costs.
b)
To enable dynamic connections.
c)
To replace all physical connections.
d)
To store data permanently.
33.
What is the main characteristic of circuit switching?
a)
Packets are transmitted independently.
b)
A dedicated path is reserved.
c)
Congestion occurs during data transmission.
d)
Bandwidth is shared dynamically.
34.
What is the main advantage of packet switching?
a)
Reliable fixed paths.
b)
No setup delay.
c)
Efficient bandwidth utilization.
d)
Guarantees no packet loss.
35.
In circuit switching, when does congestion occur?
a)
During the setup phase.
b)
During data transmission.
c)
When there is high traffic.
d)
After the call ends.
36.
Which characteristic is unique to packet switching compared to circuit switching?
a)
Uses dedicated bandwidth.
b)
Provides guaranteed delay.
c)
Packets take dynamic routes.
d)
Requires setup time.
37.
What is a key disadvantage of packet switching?
a)
Higher cost.
b)
Setup time delay.
c)
Out-of-order packet delivery.
d)
Fixed bandwidth allocation.
38.
What kind of communication is typically handled by circuit switching?
a)
Non-real-time messaging.
b)
Voice over IP (VoIP).
c)
Real-time telephone networks.
d)
Internet browsing.
39.
Which switching method laid the foundation for store-and-forward techniques in networking?
a)
Message switching.
b)
Circuit switching.
c)
Dynamic packet switching.
d)
Time-based switching.
40.
What does a protocol define in communication?
a)
The rules for data encryption.
b)
The rules for effective communication.
c)
The hardware used for communication.
d)
The storage methods for communication data.
41.
How does protocol layering help in communication?
a)
It simplifies communication by reducing layers.
b)
It divides complex communication into layers.
c)
It eliminates the need for encryption.
d)
It uses one protocol for all tasks.
42.
What is the advantage of modularity in protocol layering?
a)
Flexibility in choosing one protocol.
b)
Changes to one layer do not affect others.
c)
Layers have similar functionalities.
d)
Layers interact directly with each other.
43.
Which layer in the TCP/IP model is responsible for sending and receiving raw bits over physical media?
a)
Physical Layer.
b)
Network Layer.
c)
Transport Layer.
d)
Application Layer.
44.
What is the role of the transport layer in the TCP/IP protocol suite?
a)
Provides error control in physical transmission.
b)
Manages routing between hosts.
c)
Ensures reliable data delivery across the network.
d)
Encapsulates messages into segments for applications.
45.
Which of the following is a characteristic of the network layer in the TCP/IP protocol suite?
a)
Handles encryption of data.
b)
Provides routing and addressing.
c)
Manages end-to-end communication.
d)
Provides user applications with services.
46.
Which of the following protocols is used in the application layer to access the World Wide Web?
a)
FTP.
b)
DNS.
c)
HTTP.
d)
SMTP.
47.
What does the term “logical connections” in protocol layering refer to?
a)
Physical connections between devices.
b)
Imaginary connections between layers at both communication sites.
c)
Hardwired connections through routers.
d)
Direct links between application processes.
48.
Which layer in the TCP/IP protocol suite is responsible for ensuring logical communication between the source and destination hosts?
a)
Network Layer.
b)
Data-Link Layer.
c)
Physical Layer.
d)
Transport Layer.
49.
Which of the following is a responsibility of the data-link layer in the TCP/IP protocol suite?
a)
Routing packets to the destination.
b)
Handling encryption of data.
c)
Moving frames across links between devices.
d)
Ensuring end-to-end delivery of messages.
50.
What is the main protocol used at the network layer in the TCP/IP protocol suite for addressing and routing?
a)
TCP.
b)
IP.
c)
HTTP.
d)
SMTP.
51.
What does the transport layer provide in terms of data transmission?
a)
Flow control, error control, and congestion control.
b)
Encryption and decryption services.
c)
Routing and addressing of data.
d)
Physical transmission of bits.
52.
What is the role of the transport layer in the TCP/IP protocol suite?
a)
Ensures error-free delivery of packets.
b)
Manages process-to-process communication.
c)
Handles routing of data across links.
d)
Transmits raw bits over the transmission medium.
53.
What is the key feature of the User Datagram Protocol (UDP) in the transport layer?
a)
Connection-oriented communication.
b)
Low overhead, suitable for real-time applications.
c)
Reliable data transfer with error detection.
d)
Guarantees ordered delivery of packets.
54.
Which of the following is the correct sequence of encapsulation at the source host, from top to bottom?
a)
Application Layer → Transport Layer → Network Layer → Data-Link Layer → Physical Layer
b)
Data-Link Layer → Network Layer → Transport Layer → Application Layer → Physical Layer
c)
Transport Layer → Data-Link Layer → Network Layer → Physical Layer → Application Layer
d)
Physical Layer → Data-Link Layer → Network Layer → Transport Layer → Application Layer
55.
At which layer does encapsulation add a header that includes the source and destination host addresses?
a)
Transport Layer
b)
Network Layer
c)
Data-Link Layer
d)
Application Layer
56.
What does the transport layer add to the message during encapsulation?
a)
Source and destination IP addresses
b)
Transport-layer header with flow and error control
c)
MAC addresses for local communication
d)
Routing information for packet delivery
57.
What is the purpose of addressing at the data-link layer?
a)
To identify the specific application or service
b)
To assign unique IP addresses for routing
c)
To identify devices within a local network using MAC addresses
d)
To differentiate between multiple applications on the same host
58.
Which of the following is an example of a network-layer address?
a)
IP Address
b)
Port Number
c)
MAC Address
d)
Application Name
59.
What is the key role of the presentation layer in the OSI model?
a)
Provides end-to-end communication reliability
b)
Encrypts and decrypts data
c)
Ensures error-free communication
d)
Translates data into a format understood by the application layer
60.
How many layers are there in the TCP/IP model, and what is one of its key differences compared to the OSI model?
a)
7 layers; it has a Session and Presentation layer distinct from Application layer
b)
5 layers; the Presentation and Session layers are combined with the Application layer
c)
5 layers; there is no Application layer in the TCP/IP model
d)
7 layers; it has more distinct layers than OSI
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