Podcast
Questions and Answers
Match the following network types with their characteristics:
Match the following network types with their characteristics:
LAN = Spans a relatively large geographical area MAN = Consists of two or more LANs WAN = Spans a small geographical area
Match the following communication protocols with their characteristics:
Match the following communication protocols with their characteristics:
Circuit Switching = Uses a dedicated communications path Packet Switching = Data is sent in a sequence of small chunks Frame Relay = Provides high data rates and low error rates ATM = Uses a dedicated logical channel
Match the following network technologies with their advantages:
Match the following network technologies with their advantages:
Frame Relay = Compensates for errors with large overheads Packet Switching = Provides high data rates and low error rates Circuit Switching = Used for terminal to computer communications ATM = Used for computer to computer communications
Match the following network components with their functions:
Match the following network components with their functions:
Match the following communication protocols with their applications:
Match the following communication protocols with their applications:
Match the following network types with their connections:
Match the following network types with their connections:
Match the following communication protocols with their characteristics:
Match the following communication protocols with their characteristics:
Match the following network components with their characteristics:
Match the following network components with their characteristics:
Match the following communication protocols with their limitations:
Match the following communication protocols with their limitations:
Match the following network types with their geographical areas:
Match the following network types with their geographical areas:
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Study Notes
Data Communications, Data Networks, and the Internet
- The fundamental problem of communication is reproducing a message from one point to another.
Data Communications
- Contemporary trends:
- High and steady traffic growth
- Development of new services
- Advances in technology
- Emergence of high-speed LANs
- Corporate WAN needs
- Digital electronics
Communications Model
- Generates data
- Converts data into transmittable signals
- Carries data from source to destination
- Converts received signal into data
Communications Tasks
- Transmission system utilization
- Addressing
- Interfacing
- Routing
- Signal generation
- Synchronization
- Message formatting
- Exchange management
- Security
- Error detection and correction
- Network management
- Flow control
Data Communication System Tasks
- Transmission system utilization: efficient use of transmission facilities
- Addressing and routing: identifying intended destination and choosing a specific route
- Signal generation: required for communication
- Synchronization: determining when a signal begins and ends
- Exchange management: various requirements for communication between two parties
- Error detection and correction: required in circumstances where errors cannot be tolerated
- Flow control: preventing the source from overwhelming the destination
- Recovery: resuming activity at the point of interruption
- Message formatting: agreement on the form of data to be exchanged
- Security: providing some measure of security in a data communications system
- Network management: configuring the system, monitoring its status, reacting to failures and overloads, and planning for future growth
Data Communications Model
- Transmission Medium selection:
- Wired (e.g., fiber optic)
- Wireless (e.g., satellite and radio)
- Transmission costs are still high, hence interest in efficiency improvements
Networking
- Growth of computers is driving the need for interconnection
- Integration of voice, data, image, and video technologies
- Two broad categories of communications networks:
- Local Area Network (LAN)
- Metropolitan Area Network (MAN)
- Wide Area Network (WAN)
- WANs:
- Span a relatively large geographical area
- Consist of two or more LANs and MANs connected through public networks
- Implemented using:
- Circuit switching
- Packet switching
- Frame relay
- Asynchronous Transfer Mode (ATM)
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