32 Questions
What is the primary function of a protocol in data communication?
To govern the rules of data communication
Which of the following data communication characteristics ensures that data is delivered accurately?
Accuracy
What type of data flow is used in a computer network?
Duplex
What is the role of the sender in data communication?
To transmit the message
What is the transmission medium in data communication?
The physical path between the sender and receiver
What is a network?
A set of nodes connected together by a communication link to sharing of resources and to transmit information.
What is the characteristic of data communication that ensures data is delivered to the correct destination?
Delivery
What is an example of a node in a network?
Computer
What type of data flow is used in a remote control and TV?
Simplex
What is a Network Service?
Features or functionality that network provides.
What is the role of the receiver in data communication?
To receive the message
What is Transmission Media?
Wired or wireless communication link.
What is a Point-to-Point connection?
A connection between two nodes dedicated link.
What is a PAN?
A short-distance network designed for an individual user.
How are components of a PAN connected together?
Via Bluetooth, USB cable, IrDA (infrared), etc.
What is LAN?
A network that connects devices in a local area.
What is a LAN?
A group of nodes connected together in a small specific area
What is a CAN?
A group of interconnected LANs within a limited geographical area
What is a MAN?
A group of nodes connected together over a city
What is a WAN?
A computer network that covers large geographical area
What is a key criteria for a network?
Performance
What type of network connects devices in a home?
PAN
What type of network connects different branches in a city?
MAN
What connects different LANs in a university campus?
CAN
What are the two networking metrics used to evaluate the performance of a network?
Throughput and Delay
What is the primary concern of network security?
Protecting data from unauthorized access
What is the term used to describe a single source sending data to a specific group of nodes?
Multicast
What are the three key factors that affect network performance?
Number of users, hardware, and software
What is the term used to describe the frequency of failure and recovery time of a network?
Network reliability
What is the primary goal of protocol hierarchies in network software?
To define layers, protocols, and interfaces
What is the term used to describe a single source sending data to all nodes connected to the same network?
Broadcast
What is the term used to describe the process of delivering data accurately and efficiently?
Network performance
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
Introduction to data communication, including protocols, rules, and transmission medium.
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