WorksheetsComputer Networks Quiz
Total questions: 69
Worksheet time: 3hrs 42mins
Define data communications. Explain its 4 fundamental characteristics.
Explain different components of data communication system.
Explain different forms of information.
Describe simplex, half-duplex and full duplex methods of data flow.
Explain the 3 criteria necessary for an effective and efficient network.
Explain point to point and multipoint connection.
Explain the following topologies: Mesh ii) Star iii) Bus iv) Ring
Explain in detail LAN & WAN. List the differences between LAN & WAN.
Explain circuit-switched and packet-switched networks.
Explain TCP/IP architecture with a layer diagram.
List the 5 layers and its functionality in TCP/IP model.
With respect to in TCP/IP model, explain the following: Encapsulation and decapsulation. ii) Multiplexing and demultiplexing.
Explain four levels of addressing employed in TCP/IP protocol.
What are the uses of a layered network model? Compare OSI and TCP/IP models.
Compare the following: Analog signal vs. Digital signal. ii) Periodic signal vs. Non-periodic signal.
Describe digital signal as a composite analog signal.
Explain 2 methods for transmitting a digital signal.
What do you mean by transmission impairment? Explain causes of transmission impairment?
What are the three factors data rate is dependent on? Explain the theoretical formula which was developed to calculate the data rate.
Explain 4 performance parameters of network.
Explain in detail any 6 characteristics of digital signal.
Compare the following: Data element vs. Signal element. ii) Data rate vs. Signal rate.
Explain following encoding schemes with example: Unipolar Scheme ii) Polar Schemes iii) Bipolar Schemes.
Represent the following sequences using different line coding schemes. i) 101011100. ii) 10110011. iii) 00110101.
Define the following: Network ii) Internet iii) Protocol iv) Decibel v) SNR vi) Line coding.
Explain the PCM encoder with neat diagram.
What do you mean by Sampling? Explain three sampling methods with a neat diagram.
Explain non-uniform quantization and how to recover original signal using PCM decoder.
Explain different types of transmission modes.
What is sampling and quantization? Explain briefly.
Define digital to analog conversion? List different types of digital to analog conversion.
Describe ASK, FSK and PSK mechanisms and apply them over the digital data 101101.
Discuss the bandwidth requirement for ASK, FSK and PSK.
Explain different aspects of digital-to-analog conversion?
Define ASK. Explain BASK.
Define FSK. Explain BFSK.
Define PSK. Explain BPSK.
Explain different aspects of digital-to-analog conversion?
Define ASK. Explain BASK.
Define FSK. Explain BFSK.
Define PSK. Explain BPSK.
Explain QPSK.
Explain the concept of constellation diagram.
Explain QAM.
What is reliability in the context of networks?
What are the two types of connections mentioned?
Point-to-Point
Multipoint
What are the four basic topologies in physical topology?
What are the advantages of Bus Topology?
Easy installation
Costs less
Redundancy is eliminated
All of the above
What is a disadvantage of Star Topology?
Single point of failure
Difficult installation
High cost
None of the above
What is the main characteristic of Ring Topology?
Unidirectional traffic
Centralized management
Multiple connections
None of the above
What is the main advantage of Mesh Topology?
Congestion reduced
Easy installation
Low cost
None of the above
What does LAN stand for?
What is the role of a switch in a LAN?
What is the primary function of a switch in a LAN?
To recognize the destination address of the packet
To connect multiple devices
To reduce traffic in the LAN
All of the above
What does WAN stand for?
Wide Area Network
Wireless Area Network
Wired Area Network
World Area Network
What is a point-to-point WAN?
A network that connects two communicating devices
A network that connects multiple devices
A network that covers a large geographical area
A network that is always active
What is the main advantage of a circuit-switched network?
It is efficient when working at full capacity
It allows for multiple connections
It is easy to maintain
It has low propagation delay
What is the disadvantage of a packet-switched network?
It is less efficient than circuit-switched networks
It may encounter delays
It requires dedicated connections
It is difficult to maintain
What is the role of backbones in the Internet?
They are large networks owned by communication companies
They connect customer networks to provider networks
They provide services to end-users
All of the above
What is protocol layering?
Dividing communication tasks between different layers
Using a single protocol for all communication
Creating a network of networks
Establishing rules for communication
In the first scenario, communication is so simple that it can occur in only one layer. Assume Maria and Ann are neighbors with a lot of common ideas. Communication between Maria and Ann takes place in one layer, face to face, in the same language.
Maria and Ann communicate using regular mail through the post office. However, they do not want their ideas to be revealed by other people if the letters are intercepted. They agree on an encryption/decryption technique. The sender of the letter encrypts it to make it unreadable by an intruder; the receiver of the letter decrypts it to get the original letter.
Protocol layering enables us to divide a complex task into several smaller and simpler tasks. Modularity means independent layers. A layer (module) can be defined as a black box with inputs and outputs, without concern about how inputs are changed to outputs.
If two machines provide the same outputs when given the same inputs, they can replace each other. What is the advantage of protocol layering?
It allows us to separate the services from the implementation.
It makes the job easier.
It requires each layer to provide a service to the upper layer.
It eliminates the need for encryption.
If we want bidirectional communication, we need to make each layer able to perform 2 opposite tasks, one in each direction. For example, the third layer task is to listen (in one direction) and talk (in the other direction). What is the first principle of protocol layering?
Each layer must perform one task.
Each layer must be able to perform two opposite tasks.
Each layer must be identical at both sites.
Each layer must be independent.
The two objects under each layer at both sites should be identical. For example, the object under layer 3 at both sites should be a plaintext letter. What is the second principle of protocol layering?
Each layer must perform one task.
Each layer must be able to perform two opposite tasks.
The two objects under each layer must be identical.
Each layer must be independent.
The physical layer is responsible for movements of individual bits from one node to another node. What does the physical layer do?
It moves frames from one node to another.
It routes packets to their destination.
It transmits individual bits.
It encrypts data for secure transmission.
The data-link layer gets the datagram from the network layer, encapsulates it in a packet called a frame, and sends the frame to the physical layer. What is the responsibility of the data-link layer?
Moving bits from one node to another.
Routing packets to their destination.
Moving frames from one node to another over a link.
Encrypting data for secure transmission.
The network layer is responsible for source-to-destination transmission of data and routing the packet. Why do we need a separate network layer?
To handle encryption.
To separate different tasks between different layers.
To provide application services.
To manage physical connections.
