Physical Layer Basics

What is the primary function of the physical layer in networking?

• Transmit raw data bits over a physical medium

• Route data packets

• Establish secure connections

• Encode data for transmission

What are the two main types of transmission media used in the physical layer?

• fiber optic and coaxial

• satellite and infrared

• wired and wireless

• ethernet and Bluetooth

Explain the concept of modulation in the context of the physical layer.

• Modulation is not necessary for wireless communication.

• Modulation is the process of encoding digital data onto an analog carrier signal for transmission.

• Modulation is the process of converting analog data to digital data for transmission.

• Modulation is only used in the application layer of the OSI model.

What is the purpose of the MAC address in the physical layer?

• MAC address is responsible for routing packets in the physical layer.

• The MAC address is used for data encryption in the physical layer.

• MAC address determines the physical location of devices on a network.

• The purpose of the MAC address in the physical layer is to uniquely identify devices on a network.

What is the role of repeaters in the physical layer?

• Repeaters regenerate and retransmit signals to extend the reach of the network.

• Repeaters compress data packets to increase network speed

• Repeaters filter out unwanted signals in the network

• Repeaters convert analog signals to digital signals for transmission

Describe the difference between baseband and broadband transmission.

• Baseband transmission allows only one signal to be transmitted over a medium at a time, while broadband transmission allows multiple signals to be transmitted simultaneously by dividing the medium into multiple channels.

• Baseband transmission divides the medium into multiple channels, while broadband transmission allows only one channel.

• Baseband transmission is wireless, while broadband transmission is wired.

• Baseband transmission allows multiple signals to be transmitted simultaneously, while broadband transmission allows only one signal at a time.

What is the significance of the OSI model in understanding the physical layer?

• The OSI model does not define any standards for data transmission

• The OSI model only focuses on software layers

• The OSI model helps in understanding how data is transmitted at the physical layer by defining the standards and protocols for physical connections and data transmission.

• The OSI model is not relevant to the physical layer

How does the physical layer ensure reliable transmission of data?

• By using quantum entanglement for data transfer

• By relying on carrier pigeons for data delivery

• By transmitting data through telepathy

• By converting digital bits into signals and implementing error detection and correction mechanisms.

Discuss the importance of signal encoding in the physical layer.

• Signal encoding does not impact device compatibility

• Signal encoding only affects data storage, not transmission

• Signal encoding in the physical layer is important for data representation, transmission, error reduction, increased transfer rates, and device compatibility.

• Signal encoding is irrelevant in the physical layer

Explain the term 'bit rate' and its relevance to the physical layer.

• Bit rate is only relevant in software applications, not the physical layer

• Bit rate is the number of bits transmitted per unit of time and is essential in determining the speed of data transmission over a communication channel.

• Bit rate is a measure of the color depth in digital images

• Bit rate refers to the physical size of a computer bit