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Questions and Answers
What is the primary function of connection devices in a communication system?
What is the main purpose of a modem?
What type of connection uses a solid medium to connect sending and receiving devices?
What is the unit of measurement for the speed of data transmission?
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What is the purpose of data transmission specifications in a communication system?
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What type of modem uses the same coaxial cable as the television?
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Which type of cable is used in telephone lines and Ethernet cables?
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What is the term for converting digital signals to analog signals?
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What is the term used for sending data to a satellite?
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What is the term for a computer network that connects multiple computers to exchange information and share resources?
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Which wireless connection technology is used for high-speed internet access?
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What type of modem is also known as a WWAN modem?
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What is the primary difference between physical and wireless connections?
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What is the term for the speed of transmitting data?
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Which of the following is an application of satellite communication?
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What type of connection service uses standard phone lines to provide high-speed connection?
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What is the primary function of a switch in a network?
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What type of network topology is characterized by a central node connected to two or more nodes that are in turn connected to other nodes?
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What is the term for a device that requests and uses resources available from other nodes?
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In a bus network, how do communications travel?
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What is the term for a node that shares resources with other nodes?
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What type of network topology is characterized by a central node connected to multiple nodes that in turn are connected to other nodes?
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What is the term for a device that can be accessed over a network?
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In a ring network, how are messages sent?
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Study Notes
Connection Devices
- Telephones send and receive analogue signals, while computers use digital signals.
- A modem is required to convert digital signals to analog signals and vice versa.
- Modem stands for modulator-demodulator, which enables digital microcomputers to communicate across different media including telephone wires, cable lines, and radio waves.
- The speed of transmitting data is called the transfer rate, which is measured in millions of bits.
Types of Modems
- There are three types of modems: DSL, Cable, and Wireless.
- DSL modem provides high-speed connection using standard phone lines.
- Cable modem uses the same coaxial cable as the television.
- Wireless modem is also known as a WWAN (wireless wide area network) modem.
Connection Services
- Old dial-up services have been replaced by higher-speed connection services including:
- Digital Subscriber Line (DSL)
- Cable service
- Fiber-optic service
- Satellite connection services
- Cellular services (3G and 4G)
Networks
- A computer network is a communication system that connects two or more computers to exchange information and share resources.
- Networks can be set up in different arrangements to suit users' needs.
- The four basic elements of a communication system are:
- Sending and receiving devices
- Communication channel
- Connection devices
- Data transmission specifications
Communication Channels
- Computer channels carry data from one computer to another.
- There are two categories of communication channels:
- Physical connection
- Wireless connection
Physical Connection
- Physical connections use a solid medium (wire or cable) to connect sending and receiving devices.
- Types of physical connections include:
- Twisted-pair cable
- Coaxial cable
- Fiber-optic cable
Wireless Connection
- Wireless connection doesn't use solid substance to connect sending and receiving devices.
- Types of wireless connections include:
- Bluetooth
- Wi-Fi (wireless fidelity)
- Microwave
- Infrared
- WiMax (Worldwide Interoperability for Microwave Access)
- Cellular
- Satellite
Network Terms
- Node: any device connected to a network such as a computer, printer, or storage device.
- Client: a node that requests and uses resources available from other nodes.
- Server: a node that shares resources with other nodes.
- Directory server: a specialized server that manages resources such as users' accounts.
- Host: any computer system that can be accessed over a network.
- Switch: a central node that coordinates the flow of data by sending messages directly between sender and receiver nodes.
Network Architecture: Topologies
- Network architecture describes how a network is arranged and how resources are coordinated and shared.
- Network topology describes the physical arrangement of the network.
- Types of network topology include:
- Bus
- Ring
- Star
- Tree
- Mesh
Network Topologies
- Bus Network: each device is connected to a common cable called a bus or backbone.
- Ring Network: each device is connected to two other devices forming a ring.
- Star Network: each device is connected directly to a central network switch.
- Tree Network: each device is connected to a central node either directly or through one or more other devices.
- Mesh Network: each device is connected to every other device in the network.
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Description
Learn about the role of modems in converting digital signals to analog signals and vice versa, enabling communication between devices. Understand the concepts of modulation and demodulation.
