Questions and Answers
What are the two broad categories of communications media?
Which guided transmission media provides cleaner and faster data transmission than twisted-pair wire?
What is a major advantage of fiber-optic cable over coaxial cable?
Which wireless communication frequency range operates between 3 KHz and 300 MHz?
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What is a significant disadvantage of using microwave transmission?
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What is the range of Near Field Communication (NFC) when used for highway transponders?
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Which wireless communications specification describes how devices like cell phones and computers can be interconnected?
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Which IEEE 802.11 standard operates at 5 GHz and has a maximum data rate of 54 Mbps?
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What is a computer network?
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What does network topology refer to?
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What is the primary function of a Personal Area Network (PAN)?
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Which network type is suited for connecting systems and devices within a small area, like an office or home?
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What characterizes client/server architecture?
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In a client/server system, what role does a client play?
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Which of the following best describes broadband communications?
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What is a characteristic feature of a Wide Area Network (WAN)?
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Study Notes
Computer Networks
- A computer network is a collection of communications media, devices, and software for connecting two or more systems or devices.
- Various types of networks exist based on their size and purpose, including PAN, LAN, MAN, and WAN.
Network Topology
- Network topology refers to the layout or arrangement of different communication links and hardware devices in a network.
- It determines how data is transmitted within the network and influences performance and reliability.
Personal Area Network (PAN)
- A PAN supports the interconnection of information technology close to one individual or device.
- Commonly used for connecting devices like smartphones, tablets, and laptops within a small region.
Local Area Network (LAN)
- LAN is designed to connect computer systems and devices within a limited area, such as a home or office.
- It allows for high-speed data transfer and resource sharing among connected devices.
Client/Server Architecture
- Features multiple computer platforms dedicated to specific functions like database management or printing.
- This architecture contrasts with a single computer platform that manages all tasks.
Client Role in Client/Server System
- A client is a computer that requests services from servers in the network.
- Clients rely on servers for data and resources rather than hosting them.
Broadband Communications
- Involves telecommunications systems capable of transmitting data rapidly, akin to typical LAN speeds.
- Essential for high-speed internet access and efficient data transfer.
Communications Media Categories
- Communications media can be classified into two main types: guided (wired) and unguided (wireless).
- Guided media include physical cables, while unguided media rely on radio waves or other methods.
Guided Transmission Media
- Fiber-optic cable offers cleaner and faster data transmission compared to twisted-pair wire.
- Known for its ability to handle higher bandwidth and longer distances with less signal loss.
Fiber-Optic Cable Advantages
- Major benefits of fiber-optic cables include less signal distortion and the ability to transmit data over longer distances without degradation.
- While offering better performance, fiber-optic cables may have higher initial costs.
Wireless Communication Frequencies
- The radio frequency range operates between 3 KHz and 300 MHz, commonly used for various wireless technologies.
- Other frequencies include infrared and microwave, each with specific applications and limitations.
Microwave Transmission Disadvantages
- Microwave transmission requires an unobstructed line of sight between sender and receiver, making it vulnerable to physical obstacles.
- It is typically limited to shorter distances compared to other transmission methods.
Near Field Communication (NFC) Range
- NFC typically operates at a range of tens of centimeters and is used for applications like contactless payments and access control.
- Its short range enhances security for transactions.
Wireless Communications Specifications
- Specifications like Wi-Fi and Bluetooth define how devices, including cell phones and computers, connect wirelessly.
- Each specification has unique parameters for range, speed, and compatibility.
IEEE 802.11 Standards
- IEEE 802.11a operates at 5 GHz with a maximum data rate of 54 Mbps, suitable for high-speed wireless networking.
- Different versions, such as 802.11b, g, and n, offer varying speeds and frequency bands.
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Description
Test your knowledge on computer networks and topologies with this quiz. You'll encounter questions about network definitions, structures, and essential components. Perfect for students and professionals looking to refresh their understanding of networking concepts.
