18 Questions
What is the main purpose of a network interface card (NIC) in a computer or device?
To enable the computer or device to access a network
What is the function of a wireless access point in a network?
To allow computers and devices to transfer data wirelessly among themselves or to a wired network
How does a router function in a network?
It connects computers and transmits data to the correct destination on the network using the fastest available path
What is the primary function of a hub or switch in a network?
To provide a central point for cables in a network
What is a home network?
Multiple computers connected in a home
What is a communication channel?
A transmission media on which data travels in a communications system
What is the main purpose of a dedicated line in communications over the telephone network?
An always-on connection between two communications devices
What are the primary functions of a dial-up modem?
Converting digital signals to analog signals and vice versa
How do ISDN and DSL modems transmit data?
Through ISDN and DSL lines
What is the primary advantage of a cable modem over a dial-up modem?
It is much faster
What type of modem is used to send and receive data over a wireless network?
A wireless modem
What are some common types of communication devices found in a home network?
Routers, hubs, network cards, and wireless access points
What are the advantages of fiber-optic cable over wire cables?
Fiber-optic cables can carry significantly more data at faster speeds, are less susceptible to interference, and are smaller in size.
What is the primary purpose of broadcast radio and cellular radio?
Broadcast radio distributes radio signals over long and short distances, and cellular radio is a form of broadcast radio used for mobile communications.
What is the main distinction between twisted-pair cable and coaxial cable?
Twisted-pair cable is used for telephone systems and network cabling, while coaxial cable is often used for cable television wiring.
What is the role of a microwave station in wireless transmission?
A microwave station is an earth-based reflective dish used for microwave communications, and it must transmit in a straight line with no obstructions.
What is the primary function of a communications satellite?
A communications satellite receives microwave signals from an earth-based station, amplifies the signals, and broadcasts them back to any number of earth-based stations.
What are the benefits of using wireless transmission media?
Wireless transmission media are used when it is inconvenient, impractical, or impossible to install cables, and include technologies such as Bluetooth and IrDA.
Study Notes
Communication Devices
- A wireless network card enables a computer or device to access a network wirelessly.
- A network interface card (NIC) is another name for a wireless network card.
Wireless Access Point
- A wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or wirelessly to a wired network.
Router
- A router connects computers and transmits data to the correct destination on a network.
- Routers forward data on the Internet using the fastest available path.
- Some routers have a built-in hardware firewall.
Hub or Switch
- A hub or switch is a device that provides a central point for cables in a network.
Home Network
- A home network consists of multiple computers connected in a home.
- There are several types of home networks, including Ethernet (connected via cable), Powerline (using electrical lines in the house), and Phoneline (using telephone lines).
Communications Channel
- A communications channel is a transmission media on which data travels in a communications system.
Physical Transmission Media
- Physical transmission media include twisted-pair cable, coaxial cable, fiber-optic cable, and microwave.
Wireless Transmission Media
- Wireless transmission media include broadcast radio, cellular radio, microwave stations, and communications satellites.
Microwaves and Satellites
- A microwave station is an earth-based reflective dish used for microwave communications.
- A communications satellite is a space station that receives microwave signals from an earth-based station, amplifies signals, and broadcasts signals back to any number of earth-based stations.
Types of Lines
- A dedicated line is an always-on connection between two communications devices, including ISDN line, DSL, FTTH and FTTB, T-carrier line, and ATM.
Understand the purpose of communications software, types of lines for communication over the telephone network, and how to set up a home network using IoT. Identify physical and wireless transmission media and dedicated lines.
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