Data Communication Module 1

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Questions and Answers

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

To act as a transmission medium

To govern the rules of data communication (correct)

To receive the message

To ensure data delivery in a timely manner

Which of the following data communication characteristics ensures that data is delivered accurately?

Delivery

Timeliness

Accuracy (correct)

Protocol

What type of data flow is used in a computer network?

Transmission Medium

Half-Duplex

Duplex (correct)

Simplex

What is the role of the sender in data communication?

To transmit the message Signup and view all the answers

What is the transmission medium in data communication?

The physical path between the sender and receiver Signup and view all the answers

What is a network?

A set of nodes connected together by a communication link to sharing of resources and to transmit information. Signup and view all the answers

What is the characteristic of data communication that ensures data is delivered to the correct destination?

Delivery Signup and view all the answers

What is an example of a node in a network?

Computer Signup and view all the answers

What type of data flow is used in a remote control and TV?

Simplex Signup and view all the answers

What is a Network Service?

Features or functionality that network provides. Signup and view all the answers

What is the role of the receiver in data communication?

To receive the message Signup and view all the answers

What is Transmission Media?

Wired or wireless communication link. Signup and view all the answers

What is a Point-to-Point connection?

A connection between two nodes dedicated link. Signup and view all the answers

What is a PAN?

A short-distance network designed for an individual user. Signup and view all the answers

How are components of a PAN connected together?

Via Bluetooth, USB cable, IrDA (infrared), etc. Signup and view all the answers

What is LAN?

A network that connects devices in a local area. Signup and view all the answers

What is a LAN?

A group of nodes connected together in a small specific area Signup and view all the answers

What is a CAN?

A group of interconnected LANs within a limited geographical area Signup and view all the answers

What is a MAN?

A group of nodes connected together over a city Signup and view all the answers

What is a WAN?

A computer network that covers large geographical area Signup and view all the answers

What is a key criteria for a network?

Performance Signup and view all the answers

What type of network connects devices in a home?

PAN Signup and view all the answers

What type of network connects different branches in a city?

MAN Signup and view all the answers

What connects different LANs in a university campus?

CAN Signup and view all the answers

What are the two networking metrics used to evaluate the performance of a network?

Throughput and Delay Signup and view all the answers

What is the primary concern of network security?

Protecting data from unauthorized access Signup and view all the answers

What is the term used to describe a single source sending data to a specific group of nodes?

Multicast Signup and view all the answers

What are the three key factors that affect network performance?

Number of users, hardware, and software Signup and view all the answers

What is the term used to describe the frequency of failure and recovery time of a network?

Network reliability Signup and view all the answers

What is the primary goal of protocol hierarchies in network software?

To define layers, protocols, and interfaces Signup and view all the answers

What is the term used to describe a single source sending data to all nodes connected to the same network?

Broadcast Signup and view all the answers

What is the term used to describe the process of delivering data accurately and efficiently?

Network performance Signup and view all the answers

Study Notes

Introduction to Data Communication

Data communication is the exchange of data between two devices via some form of transmission medium
It involves a sender, receiver, transmission medium, message, and protocol

Components of Data Communication

Message: data
Sender: device that sends the message
Receiver: device that receives the message
Transmission Medium: physical path between sender and receiver
Protocol: set of rules governing data communication

Data Communication Characteristics

Delivery: data must be delivered to the correct destination
Accuracy: data must be delivered accurately
Timelines: data must be delivered in a timely manner

Data Flow in Communication

Simplex: one-way communication (e.g. remote control and TV)
Half-Duplex: two-way communication, but not simultaneously (e.g. walkie-talkie)
Duplex: two-way communication, simultaneously (e.g. computer network and mobile network)

Network

A network is a set of nodes connected together to share resources and transmit information
Node: computer, printer, scanner, software, PDA, etc.
Information: text, voice, picture, etc.

Network Services

Sharing (file, printer, application)
Internet browsing
Fax Service
Telephony
Conferencing
Database
Backup

Network Components

Transmission media (wired, wireless)
Network Operating System (NOS)
Network Interface Card (NIC)
Network Hardware: hubs, switches, routers, gateways, access point, repeaters

Network Classification

Upon transmission medium: point-to-point, multipoint
Upon scale (size): PAN, LAN, CAN, MAN, WAN

PAN (Personal Area Network)

Short-distance network for individual user
Components: printer, mobile, computer, wireless printers, PDA, etc.
Connected via Bluetooth, USB cable, IrDA (infrared), etc.

LAN (Local Area Network)

Group of nodes connected in a small specific area
Components: workstations, computers, scanner, printers, servers, etc.

CAN (Campus Area Network)

Group of interconnection LAN within limited geographical area
Used in school campus, military base, university campus, etc.

MAN (Metropolitan Area Network)

Large computer network connecting LAN in different locations (cities)
Connects different branches in a city

WAN (Wide Area Network)

Computer network covering large geographical area
Connects different types of networks together

Network Criteria

Performance
Reliability
Security

Performance

Depends on number of users, transmission medium, hardware, and software
Evaluated by throughput and delay

Reliability

Measured by frequency of failure and recovery time

Security

Includes protecting data from unauthorized access, damage, and implementing security policies

Network Modes

Unicast: single source sends to single node
Multicast: single source sends to specific nodes (group)
Broadcast: single source sends to all nodes connected to the same network

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Description

Introduction to data communication, including protocols, rules, and transmission medium.