Wired communication MCQs Quiz | Class 9
This quiz is for Class IX students of Computer Applications (Code 165), based on Unit 1: Basics of Information Technology. It covers key concepts of wired communication, focusing on using cables and examples like Ethernet. Test your knowledge, submit your answers to see your score, and download a PDF of your answer sheet for review.
Understanding Wired Communication
Wired communication refers to the transmission of data from one device to another through a physical medium, such as cables or wires. This method is a fundamental part of computer networking and is known for its reliability, speed, and security compared to wireless alternatives. The most common technology used for wired Local Area Networks (LANs) is Ethernet.
Key Concepts in Wired Communication
1. Ethernet
Ethernet is not a single type of cable but a family of networking technologies used to connect devices in a wired LAN. It defines the rules for how data is formatted and transmitted over the physical cables so that all connected devices can understand each other. Modern Ethernet can achieve speeds from 100 Mbps (Megabits per second) to over 100 Gbps (Gigabits per second).
2. Types of Cables
Different types of cables are used for wired communication, but the most prevalent for Ethernet is the Twisted-Pair Cable.
- Twisted-Pair Cable: This cable consists of pairs of insulated copper wires twisted together. The twisting is crucial as it helps to reduce electromagnetic interference (EMI) from external sources and crosstalk from adjacent pairs. Common categories include Cat 5e, Cat 6, and Cat 6a, which support progressively higher speeds and bandwidth.
- Coaxial Cable: An older type of cable, once used for Ethernet but now more common for cable television (CATV).
- Fiber Optic Cable: Transmits data using light pulses through thin strands of glass or plastic. It offers the highest speeds and is immune to EMI but is more expensive and fragile.
3. Connectors and Ports
The standard connector for twisted-pair Ethernet cables is the RJ-45 connector. It looks like a larger version of a telephone jack (RJ-11). This plug connects to an Ethernet port (also called an RJ-45 port) on devices like computers, routers, and switches.
Comparison of Wired vs. Wireless Communication
| Feature | Wired Communication (e.g., Ethernet) | Wireless Communication (e.g., Wi-Fi) |
|---|---|---|
| Speed | Generally faster and more consistent. | Can be fast, but more susceptible to speed fluctuations. |
| Reliability | Highly stable connection, not affected by most interference. | Can be affected by walls, distance, and other electronic devices. |
| Security | More secure as it requires physical access to the network. | Less secure as signals can be intercepted; requires strong encryption. |
| Mobility | Limited, as devices must be connected by a cable. | High, allowing devices to connect from anywhere within range. |
Quick Revision Points
- Wired communication uses physical cables for data transfer.
- Ethernet is the most common wired networking technology for LANs.
- Twisted-pair cables (like Cat 5e/Cat 6) are standard for modern Ethernet.
- Twisting wires reduces electronic interference.
- The RJ-45 connector is the standard plug for Ethernet cables.
- Wired networks are typically faster, more reliable, and more secure than wireless networks.
- The main disadvantage of wired networks is the lack of mobility.
Practice Questions
- What does ‘LAN’ stand for in the context of networking?
- If you connect your desktop computer directly to your router with a cable, what kind of communication are you using?
- Why is fiber optic cable often used for long-distance internet backbones?
- Name the device that acts as a central connection point for computers in a wired network.
- What physical factor might weaken a Wi-Fi signal but would not affect an Ethernet connection?
