Network Performance and Communication Quiz

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Questions and Answers

Which of the following is NOT a measure of network performance?

Transit time

Recovery time (correct)

Response time

Throughput

Which factor affects network performance by increasing the response time?

Type of transmission medium

Capabilities of the connected hardware

Number of users (correct)

Efficiency of the software

What defines a point-to-point connection in a network?

Connection between multiple devices

Shared communication capacity among devices

Two devices having a dedicated link (correct)

Transmission occurring at different times

Which network topology provides direct links between all devices involved?

Mesh Signup and view all the answers

Which aspect of security focuses on protecting data from unauthorized access?

Access controls Signup and view all the answers

In a multipoint connection, what is shared among the connected devices?

Transmission medium Signup and view all the answers

What characteristic is a common criteria to measure reliability in networks?

Frequency of failure Signup and view all the answers

Which of the following best describes a temporal sharing in multipoint connections?

Devices taking turns to transmit Signup and view all the answers

What happens if packets arrive with different delays, such as 30-ms and 40-ms?

An uneven quality in the video results. Signup and view all the answers

Which of the following is NOT a component of a data communication system?

Network Browser Signup and view all the answers

In a half-duplex communication system, what can devices do?

Transmit and receive at different times. Signup and view all the answers

Which of the following communication methods allows devices to transmit and receive at the same time?

Full-Duplex Signup and view all the answers

What is the role of a protocol in data communications?

It sets the rules governing data communications. Signup and view all the answers

Which physical medium is NOT mentioned as a typical path for data transmission?

Infrared signals Signup and view all the answers

In data flow communication, what does simplex refer to?

Unidirectional communication Signup and view all the answers

Which example is suitable for full-duplex communication?

Telephone networks Signup and view all the answers

What is the primary focus of the course objectives in CS452: Data Communications?

To provide an overview of basic principles and terminologies in data communication. Signup and view all the answers

Which factor does NOT contribute to the effectiveness of a data communication system?

Latency Signup and view all the answers

Which of the following best describes timeliness in data communication?

Data must arrive without delay for real-time applications. Signup and view all the answers

In the context of data communication, what does jitter refer to?

The variation in packet arrival time. Signup and view all the answers

Which chapter in the course content specifically addresses digital transmission?

Chapter 4: Digital Transmission Signup and view all the answers

What are the total marks allocated for the Data Communications course evaluation?

120 Signup and view all the answers

Which of the following is NOT a characteristic necessary for effective data communication delivery?

Data must compress to optimally fit the medium. Signup and view all the answers

What aspect of data communication does the physical layer primarily address?

The actual transmission of raw bitstreams over a physical medium. Signup and view all the answers

How many physical channels are needed to connect n devices in a fully connected mesh network?

$rac{n(n - 1)}{2}$ Signup and view all the answers

In a mesh network with 6 devices, how many ports must each device have?

5 Signup and view all the answers

What is the primary characteristic of a star topology in a Local Area Network?

Each node connects to a central point. Signup and view all the answers

In a bus topology, how does the network function?

Signals are passed along a single cable backbone. Signup and view all the answers

What is a distinguishing feature of a wide area network (WAN)?

Covers a broad area, linking multiple LANs. Signup and view all the answers

Which topology combines the characteristics of both star and bus topologies?

Hybrid Topology Signup and view all the answers

What term is used to describe the vast global network connecting millions of private and public networks?

Internet Signup and view all the answers

In a ring topology, how is a signal transmitted?

One device to the next in one direction only. Signup and view all the answers

What is the primary purpose of a protocol in data communication?

To govern communication between devices Signup and view all the answers

Which statement accurately describes simplex communication?

It supports one-way data transmission only. Signup and view all the answers

In which of the following scenarios does a half-duplex system operate?

Only one user can talk while the other listens. Signup and view all the answers

Which type of network is usually restricted to a small area, such as a building or campus?

LAN Signup and view all the answers

What best defines the 'message' in a data communication system?

The information being transmitted Signup and view all the answers

Which network topology features a direct connection between every device?

Mesh Signup and view all the answers

What is a common advantage of multipoint connections compared to point-to-point connections?

Reduced communication costs Signup and view all the answers

What are the three criteria necessary for an effective and efficient network?

Reliability, speed, and effectiveness Signup and view all the answers

What is the main difference between half-duplex and full-duplex transmission modes?

Half-duplex allows only one device to transmit at a time. Signup and view all the answers

How many layers are there in the OSI model?

7 Signup and view all the answers

Which layer in the OSI model is responsible for routing and logical addressing?

Network Layer Signup and view all the answers

Which layer in the TCP/IP model combines the functions of the OSI's Application, Presentation, and Session layers?

Application Layer Signup and view all the answers

Which protocol in the TCP/IP model provides connectionless, unreliable communication between applications?

UDP Signup and view all the answers

In the OSI model, which layer handles reliable data transfer and error recovery?

Transport Layer Signup and view all the answers

Which of the following is NOT a layer in the TCP/IP model?

Presentation Layer Signup and view all the answers

What is the primary function of the Session layer in the OSI model?

Establishing, managing, and terminating connections Signup and view all the answers

Study Notes

Course Information

Course Title: Data Communications
Course Code: CS452
Course Book: Data Communications and Networking, Fifth Edition, Behrouz A. Forouzan

Course Objectives

Provide a comprehensive overview of basic data communication principles and terminologies.
Explore the role of the physical layer in data communication.
Analyze principles and techniques of both digital and analog transmission.

Course Content

Overview (Revision)
Chapter 1: Introduction
Chapter 2: Network Models
Physical Layer
Chapter 3: Introduction to Physical Layer
Chapter 4: Digital Transmission
Chapter 5: Analog Transmission
Chapter 6: Bandwidth Utilization: Multiplexing and Spectrum Spreading

Course Evaluation

Lectures: 3 hours
Labs: 3 hours
Written Exam: 80 marks
Oral & Lab: 20 marks
Test: 20 marks
Total Marks: 120

Data Communication Components

Message: Information to be communicated (text, numbers, pictures, audio, video)
Sender: Device sending the data message (computer, workstation, handset, video camera)
Receiver: Device receiving the message (computer, workstation, handset, television)
Medium: Physical path for message transmission (coaxial cable, fiber optics, radio waves, twisted pair)
Protocol: Set of rules for data communication (HTTP, FTP, TCP, UDP)

Data Flow

Communication between devices can be:
Simplex: Unidirectional flow (one device transmits, one receives)
Half-Duplex: Bidirectional, but one-way at a time
Full-Duplex: Bidirectional, simultaneous transmission and reception

Network Criteria

Performance: Measured by transit time, response time, throughput and delay time.
Reliability: Frequency of failure and recovery time after a failure.
Security: Protecting data from unauthorized access, damage, and breaches.

Network Connections

Link: Communications pathway for data transfer between devices
Point-to-Point: Dedicated link between two devices
Multipoint: More than two devices share a single link (spatially or timeshared)

Network Topologies

Mesh: Every device has dedicated point-to-point connection with every other device
Star: All nodes are individually connected to a central connection point (e.g., a hub or switch)
Bus: One long cable is the backbone of the network; all devices are connected to the cable
Ring: Each device has a dedicated point-to-point connection to only the two devices on either side of it; signal passed along the ring in one direction

Hybrid Topology

A combination of two or more topologies

Network Types

LAN (Local Area Network): Network confined to a limited geographical area (e.g., home, office, school)
WAN (Wide Area Network): Network covering a broad area (e.g., connecting multiple LANs)

The Internet

A vast global network of interconnected networks
Connects millions of private, public, academic, business, and government networks

Exercises (True or False)

Protocol: Set of rules for communication between devices
Simplex: Data flow in one direction
Half-duplex: Communication in one direction at a time
Internet: Private network within a small area (False)
Bus topology: All devices share a common backbone cable

Exercises (Multiple Choice)

Which network type is confined to a single office, building, or campus? LAN
What is the "message" in a communication system? The information being transmitted
Which network topology has dedicated connections between all devices? Mesh

Practical Exercises

Python code examples simulating simple data communication
The code demonstrates sending and receiving messages, including factors like accuracy & timeliness.
More detailed practical tasks are included, such as creating code for a simple chat application

Additional Tasks

OSI model and its layers function
Difference between OSI and TCP/IP models
Additional questions on specific tasks, layers and protocols.

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Description

Test your knowledge on network performance measures, protocols, and communication methods. This quiz covers various concepts, including network topologies, data communication systems, and security aspects. Challenge yourself and deepen your understanding of networking!