14 Questions
What determines the operation of a CSMA/CD bus?
Ethernet network
How many connections are required in a fully mesh topology with 15 nodes?
105
In which layer is the MAC address used?
Data Link layer
Which protocols are used in the Transport layer?
TCP and UDP
What is the purpose of the FCS or CRC in the IEEE 802.3 standard?
Error detection and correction
What is the effect of increasing the Signal-to-Noise Ratio (SNR)?
Decreases bit error rate
Which device is used to convert digital data to an analog signal?
Modem
What is the size of the output signal if we have a signal with size 2 multiplied by a unit step signal at t=0?
2
In which layer of the OSI model is the segment PDU located?
Transport
In which layer of the OSI model does a Hub device operate?
Physical
What is a signal that has a value of specific points in time called?
Discrete
How many connections are required in a fully mesh topology with 6 nodes?
15
What is the value assigned to the transmission of IP datagrams over Ethernet networks?
0800
What is the frequency range of the signals produced by modems?
300-3400Hz
Study Notes
Data Communication
- A modem is used to convert digital data to an analog signal.
Signals
- A signal that has a value at specific points in time is called a discrete signal.
- A signal that has a value at all instances is called a continuous signal.
- A signal that has a value at specific points in time is also called a digital signal.
- A signal that has a value at all instances is also called an analog signal.
Network Layers
- The segment PDU is in the Data Link layer.
- The hub device operates in the Physical layer.
- The repeater device operates in the Physical layer.
- MAC address is used in the Data Link layer.
- TCP and UDP protocols are used in the Transport layer.
Network Topology
- In a fully mesh topology, the number of connections required is calculated using the formula n*(n-1)/2, where n is the number of nodes.
- For example, if there are 6 nodes in a fully mesh topology, 15 connections are required.
- If there are 15 nodes in a fully mesh topology, 105 connections are required.
Network Devices
- A modem produces signals in the voice-frequency range from 300-3400HZ.
- A transducer is used to capture physical phenomena into an electrical signal.
Network Protocols
- The transmission of IP datagrams over Ethernet Network uses the value 0800 in hex.
- The operation of CSMA/CD bus is used in Ethernet network.
Network Cables
- UTP straight cable can connect a PC to a Switch or a PC to a Router.
- UTP straight cable cannot connect two switches.
Network Performance
- When SNR is increased, BER is decreased.
- An increase in Signal to noise ratio (SNR) decreases bit error rate.
MAC Address
- A MAC address has 48 bits.
- A MAC address is used in the Data Link layer.
A short quiz to test your understanding of data communication concepts, including devices, signal processing, and network layers.
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