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WorksheetsPhysical Layer of Networks
Total questions: 23
Worksheet time: 17mins
What are the main types of transmission media used in computer networks?
Guided media (twisted pair, coaxial, fiber optic) and unguided media (radio waves, microwaves, infrared)
Optical media (CDs, DVDs)
Wired media (HDMI, USB)
Satellite communication (television signals)
Explain the difference between guided and unguided transmission media.
Unguided transmission media use physical pathways, while guided media transmit data through air.
Guided transmission media are slower than unguided media, which are faster.
Guided transmission media are always wireless, while unguided media require cables.
Guided transmission media use physical pathways (e.g., cables), while unguided transmission media transmit data through air or space (e.g., radio waves).
What is the purpose of signal encoding techniques in data transmission?
To enhance the quality of audio signals.
To reduce the size of data files.
To encrypt data for security purposes.
To convert data into signals for efficient and reliable transmission.
Name three common signal encoding techniques used in networks.
Quadrature Amplitude Modulation (QAM)
Non-Return to Zero (NRZ), Manchester encoding, Pulse Code Modulation (PCM)
Frequency Shift Keying (FSK)
Amplitude Modulation (AM)
What is modulation and why is it important in communication systems?
Modulation is the process of varying a carrier signal to encode information, and it is important for efficient data transmission and signal quality in communication systems.
Modulation is the process of amplifying a signal to increase its strength.
Modulation is used to reduce noise in communication systems by eliminating data.
Modulation refers to the process of decoding information from a signal.
Describe the difference between amplitude modulation and frequency modulation.
Amplitude modulation alters the frequency of the carrier wave.
Amplitude modulation changes the amplitude of the carrier wave, while frequency modulation changes the frequency of the carrier wave.
Both modulation types affect the phase of the carrier wave.
Frequency modulation changes the amplitude of the carrier wave.
What role do network interface cards (NICs) play in a computer network?
NICs are used to power the computer.
NICs enable computers to connect to and communicate over a network.
NICs store data for long-term access.
NICs manage the operating system updates.
What are the key features to consider when selecting a network interface card?
Operating system, software compatibility, aesthetics
Price, warranty, color, size
Speed, compatibility, form factor, features, brand and support.
Power consumption, noise level, weight
Define physical layer protocols and their significance in networking.
Physical layer protocols are only relevant for wireless communication.
They define the software standards for application layer protocols.
Physical layer protocols are essential for defining the standards for data transmission over physical media, ensuring reliable communication and device compatibility.
Physical layer protocols are not necessary for network security.
List two examples of physical layer protocols and their functions.
1. Ethernet: Defines standards for wired local area networks. 2. USB: Specifies connection and communication between devices and hosts.
FTP: Transfers files over the internet.
HTTP: Manages web page requests and responses.
SMTP: Sends and receives email messages.
What are transmission impairments and how do they affect data transmission?
Transmission impairments enhance signal quality during data transmission.
Transmission impairments are factors that degrade signal quality during data transmission, affecting reliability and speed.
Transmission impairments are irrelevant to data transmission.
Transmission impairments only affect video signals, not data.
Identify common types of transmission impairments in networks.
Bandwidth
Common types of transmission impairments in networks include attenuation, distortion, noise, crosstalk, and jitter.
Throughput
Latency
What are the primary goals of a computer network?
Reduce network speed
Increase hardware costs
Limit user access
Enable communication, share resources, provide internet access, ensure data security, facilitate centralized management.
Explain the difference between connection-oriented and connectionless services.
Connection-oriented services provide reliable, ordered communication with a dedicated connection, while connectionless services offer faster, simpler communication without guarantees.
Connection-oriented services do not guarantee data delivery or order.
Connectionless services require a dedicated connection for communication.
Connection-oriented services are always slower than connectionless services.
What are the different types of network connections?
Wired (Ethernet), Wireless (Wi-Fi), Cellular (4G/5G), Fiber Optic, Bluetooth.
Infrared (IR)
Dial-up (Modem)
Satellite (Dish)
Describe the various switching techniques used in networks.
Data switching, voice switching, and video switching
Circuit routing, packet routing, and message routing
The main switching techniques used in networks are circuit switching, packet switching, and message switching.
Frame switching, cell switching, and stream switching
How does network performance impact overall system efficiency?
Network performance has no effect on system efficiency.
System efficiency is solely determined by hardware specifications.
Data transmission speed is irrelevant to network performance.
Network performance directly impacts overall system efficiency by influencing data transmission speed and reliability.
What are the common topologies of networks?
Tree
Grid
Point-to-Point
Star, Bus, Ring, Mesh, Hybrid
Compare and contrast star and bus network topologies.
Bus topology provides better performance and reliability than star topology.
Star topology is more complex and expensive than bus topology.
Star topology offers better performance and reliability, while bus topology is simpler and cost-effective but less reliable.
Star topology requires fewer cables than bus topology.
What factors influence the choice of a network topology?
Factors influencing network topology include scale, cost, performance, maintenance, fault tolerance, and application needs.
Network topology is fixed and cannot change over time.
The choice of topology is only influenced by the type of cables used.
Network topology is solely determined by the number of devices.
What are the advantages and disadvantages of using fiber optic cables compared to copper cables in networking?
Fiber optic cables are more prone to interference than copper cables.
Copper cables are faster than fiber optic cables.
Fiber optic cables offer higher bandwidth and longer distance transmission, while copper cables are cheaper and easier to install.
Both types of cables have the same performance and cost.
How do routers differ from switches in a network?
Routers connect different networks and route data between them, while switches connect devices within the same network and manage data traffic.
Routers are faster than switches in data transmission.
Routers operate only on Layer 1 of the OSI model, while switches operate on Layer 2.
Switches are used for wireless connections, while routers are used for wired connections.
What is the significance of the OSI model in networking?
The OSI model provides a framework for understanding and designing network protocols and communication processes.
The OSI model is only relevant for wireless networks.
The OSI model is outdated and not used in modern networking.
The OSI model defines hardware specifications for network devices.
