Module 4: Understanding the Physical Layer of Networks

What is the primary function of the physical layer in the OSI model?

• To establish, maintain, and terminate network connections

• To transmit raw bit streams over a physical medium

• To provide error detection and correction

• To manage data encryption and decryption

Which of the following is a common physical medium used in the physical layer?

• HTTP

• Ethernet cable

• IP address

• TCP

What unit is typically used to measure the data transfer rate at the physical layer?

• Bytes per second

• Bits per second

• Packets per second

• Frames per second

Which of the following is NOT a function of the physical layer?

• Modulation

• Signal transmission

• Data compression

• Bit synchronisation

What type of signal is used in fibre optic cables?

• Electrical signals

• Radio waves

• Light signals

• Sound waves

Which of the following devices operates at the physical layer?

• Router

• Switch

• Hub

• Firewall

What is the maximum range of a Bluetooth device in metres?

• 3 metres

• 10 metres

• 30 metres

• 100 metres

Which of the following is a characteristic of twisted pair cables?

• They use light signals for data transmission

• They are immune to electromagnetic interference

• They consist of pairs of wires twisted together

• They are used for long-distance communication

What is the maximum data rate of a standard USB 2.0 connection?

• 480 Mbps

• 1 Gbps

• 100 Mbps

• 10 Gbps

Which of the following is a disadvantage of using coaxial cables?

• High cost

• Susceptibility to interference

• Limited bandwidth

• Bulky size