Data Communication And Networking Questions And Answers Pdf

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Data communication and networking exam questions and answers, online learning computer networking MCQs, competency based interview questions for online computer science degree programs.

Data Communications and Networking Questions and Answers

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Download PDF. A short summary of this paper. Provide a brief description of each service and indicate what type of application might use that service. TCP is a connection oriented data service that provides a reliable loss free end to end connection. Peer to peer communication between applications is often managed using TCP.

Describe the "token bucket" mechanism for congestion control. With which other technique is token bucket usually combined to achieve complete ow control? What problems in the simpler approach are addressed by using a "token bucket" mechanism? Generally SDU plus control information. May be a p art of an SDU with a header. N-PDU's are the packet format exchanged b etween peers at layer N of the protocol stack. Use these de nitions or any other discussion to illustrate the fundamental di erence between a Service and a Protocol.

A p r otocol uses a number of services to manage the exchange of data. Thus a protocol may be c ompared to an algorithm, and the services to the instructions which are u s e d to express that algorithm. In particular, explain using an example how information about a node failure propagates using this algorithm. What problem is encountered in deciding whether a host has become unreachable?

In what circumstances is it impossible to resolve this problem? To c ompute its routing table a host computes the value of the chosen metric with respect to all its neighbours, and also obtains the routing vectors of all its neightbours.

It then computes the distance metric to a destination A for each neighbour, destination pair. The host then chooses the neighbour with the minimum distance value to be used t o forward messages to the destination A. This process is repeated for all destinations in the network. How do we decide that the delay vector entry has become high enough to register the host as unreachable? This is called the count to in nity problem.

Then we can set in nity to be network diameter plus 1. If the metric is time based w e n e ed an estimate of the maximum acceptable delay. In this case it is possible that congestion will cause some hosts to be marked as unreachable from time to time. However, since host recovery propagates quite quickly this may not be a p r oblem at least in relatively small networks. It has been claimed that state machines are a natural tool for protocol analysis since protocol implementations can be derived directly from the state transition tables.

Discuss this assertion and argue for or against the implementation of protocols using this approach. By deriving the implementation directly from the speci cation with little need for interpretation the possibility of erroneous implementations is decreased.

In addition it has been argued b y T annenbaum and others that state transition based programming is the natural way to implement protocols, and to visualise their operation. Thus the choice of state machines for the analysis and validation of protocols is both natural and e ective. Especially since t o ols are available that are c apable of generating implementation code directly from the speci cation. In de ning the role of a rewall, you should discuss the techniques that a rewall uses at di erent levels to prevent external attacks on the network and control tra c ow through the rewall.

To p r event the occurence of this bit pattern in the payload and thus incorrect identi cation of a frame boundary by the receiver we will modify the payload by inserting a 0 bit into the stream after every consecutive ve 1 bits seen in the payload.

Unstu ng at the receiving end will remove these zero b i t s a n d r estore the format of the original frame payload. Describe the OSI seven layer model. Name each of the layers in the model and draw a diagram that shows the ordering of these layers.

Write a paragraph describing the areas of function that each l a yer is responsible for. Using a diagram show the correspondence between relevant protocol layers in the two models.

Discuss the relative merits of each of these models in the context of modern computer networking. In terms of discussing relative merits students should touch on the following key ideas. Political in uence on the OSI model, thus the OSI protocol stack represents a design philosophy created b y c ommittee OSI failed to gain wide acceptance in the industry and consequently is largely of academic interest.

OSI provides a much better model of layering and clearly de nes and separates protocols, interfaces and services. This allows for greater exibility and allows the layers to be viewed and implemented independently of each other. Discuss the hierarchy and addressing issues surrounding the construction of large networks. Identify the major emerging problems for IPv4 and discuss how they are addressed in IPv6.

In particular the following points:length of addresses size of routing tables as a function of number of hosts. In the context of IPv4 the discussion will center on the issues surrounding the packet header elds, and the current IP address space. Use of class B networks for small numbers of hosts and the resulting waste in the address space should be discussed, and the the use of CIDR to resolve some of these problems in the near future s h o u l d b e described.

Consideration of IPv6 should touch on the arguments associated with selecting the new address format, and the elimination of the checksum eld and other changes to the packet header. Describe the physical construction characteristics of the following transmission media. If there is more than one type of each media then present the choices of type, and identify the di erences between them. Twisted pair Coaxial cable Optical bre cable 9]Possible choices for data communication infrastructure for long distance data transfer include microwave, optical bre and radio transmission.

Discuss the advantages and disadvantages of each of these media, in terms of cost, political impact, ease of installation and adaptability i n p r o viding a range of services to clients.

Name two t ypes of frequency splitting strategy, and identify how they are di erent. Twisted p air is the common telecommunications wiring standard for o ce and domestic buildings throughout the 's and 's. In the late 's UTP, Uninsulated Twisted Pair set of places in the net 1] T The set of transitions in the net 2] I The input mapping function, applied t o a t r ansition generates the set of input places to that transition.

Comment o n w h y such techniques are used in analysing protocols, and give some examples of the types of problems that such an analysis can reveal. Formal analysis tools such as petri nets and nite state machines represent the logical structure of the protocol and allow designers to investigate the operation of the protocol in all possible situations.

State space expansion can identify failure m o des, and deadlock situations that can arise if certain sequences of events occur. In addition, such analysis can reveal redundant states and thus be used to optimise the protocol. Safety properties can also be p r oposed and veri ed. The use of some speci cation tools can assist in automatic veri cation using computer analysis which eliminates the possibility of human error, an important factor in many proof techniques.

For three marks each de ne the following general terms used when discussing protocols. Related Papers. Ord Okt99 IT. By shyma mohammed. By ibrahim nur.

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Data Communications and Networking Questions and Answers

About Blog Location. Collection of hardware components and computers B. Interconnected by communication channels C. Sharing of resources and information D. Fewer number of cells are required Please do Subscribe on YouTube! ResearchGate has not been able to resolve any references for this publication. Data Communication and Networking — Data and Signals multiple choice based questions and answers pdf cover the below lists of topic, 1.

Data Communications and Its Characteristics Data Communications and Its Characteristics: Data communications means the exchange of data between two devices via some form of transmission medium such as a wire cable. For data communications to occur, the communicating devices must be part of a communication system made up of a combination of hardware physical equipment and software programs. The effectiveness of a data communications system depends on four fundamental characteristics: delivery, accuracy, timeliness, and jitter. Read more A network is a set of devices often referred to as nodes connected by communication links.


Data Communication and Networking – Network Model multiple choice Questions and Answers PDF,it cover the below lists of topic, All the Multiple Choice.


Data Communication and Networking MCQs

Subjective Questions With Answers. Introduction to Computer Networks. Data Communication: When we communicate, we are sharing information.

We provide complete data communication and networking pdf. Data Communication and Networking lecture notes include data communication and networking notes, data communication and networking book , data communication and networking courses, data communication and networking syllabus , d ata communication and networking question paper , MCQ, case study, questions and answers and available in data communication and networking pdf form. So, students can able to download data communication and networking notes pdf.

We have compiled the most frequently asked Networking Interview Questions and Answers that will help you to prepare for the Networking basics interview questions that an interviewer might ask you during your interview. In this list of Networking interview questions, we have covered all commonly asked basic and advanced interview questions on networking with detailed answers to help you clear the job interview. This detailed guide of Network Engineer interview questions will help you to crack your Job interview easily. A link refers to the connectivity between two devices.

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Top 151+ Data Communication Quiz Questions and Answers 2020-2021 - 1

What is the minimum number of wires needed to send data over it serial communication link layer? An error detecting code is the remainder resulting from dividing the bits to be checked by a predetermined binary number, is called. How much power approximately a light-emitting diode can couple into an optical fiber? Which of the following transmission systems provides the highest data rate to an individual device? Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undetected error? Students can learn and improve on their skillset for using Data Communication and Networking MCQs effectively and can also prepare for competitive examinations like

Networking protocols multiple choice Questions and Answers. Solved Multiple Choice Questions on Computer networking The data unit created at the application layer is called a message, at the transport layer the data unit created is called either a segment or an user datagram, at the network layer the data unit created is called the datagram, at the data link layer the datagram is encapsulated in to a frame and finally transmitted as signals along the transmission media. What is Network and explain characteristics of Networks? Answer: Option D.

Data Communication and Networking Questions

A protocol is a rule governing a time sequence of events that must take place. Which of the following methods provides dedicated communications channel between two stations? An error detecting code is the remainder resulting from dividing the bits to be checked by a predetermined binary number, is called. Which of the following techniques needs source device and destination device in line of sight for data transfer? A combination of hardware and software, which provides facilities sending and rationing of information between computer devices. What is the main difference between synchronous and asynchronous transmission? Students can learn and improve on their skillset for using Data Communication and Networking MCQs effectively and can also prepare for competitive examinations like

Data Communications and Its Characteristics Data Communications and Its Characteristics: Data communications means the exchange of data between two devices via some form of transmission medium such as a wire cable. For data communications to occur, the communicating devices must be part of a communication system made up of a combination of hardware physical equipment and software programs. The effectiveness of a data communications system depends on four fundamental characteristics: delivery, accuracy, timeliness, and jitter. Read more A network is a set of devices often referred to as nodes connected by communication links.

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