Cnt 4004 Computer Networks : Assessment Answers

A group decision system is being built over a network and, because of the lag inherent to the network, is experiencing delays. For each of the situations below, suggest the longest acceptable amount of time the delay could last without negatively affecting the user. Provide a rationale for each
estimate, and include relevant examples and research in your response.

1.System confirming the users password during log-in

2.Synchronous group editing of a document

3.Asynchronous critiquing of other participants work

4.Voting on serious issues

Introduction:

There has been a rising lag of time turning inherent to the network. As a result of this, the network is experiencing delays. The following study is made on the decision systems built over a network.

A longest acceptable time delay could which last for some particular cases are discussed here. A rationale for every estimate is provided including researches and examples. The study includes the instances of system confirming users’ passwords, synchronous group editing, asynchronous critiquing and voting on essential scenarios.

1. System confirming the user's password during log-in: 

This must take place 0.5 seconds after the password gets entered. The present users have been expecting a reasonably instantaneous password. This is done by prompting or confirming as the password is improper. This also happens over any network (Elahi & Alfi, 2017).

One example of the system login is the Logon Banner. It is the verbiage seen by the end-users during the access to any system setting proper expectations for the users. This is about the acceptable and authorized use of the network access capabilities.

2. Synchronous group editing of document:

There are rising concerns about group editing of the activities that are done synchronously. A user is needed to be under the control of the papers. The others, on the other side, must supply the inputs. As there take place a collaborative activity in the departments, the control process of the document version should be placed in the proper area and then followed. There must be the assuming that the task is done (Mu, Stokking & Den Hartog, 2017). Then the author who is in control of that document must have any opinion regarding the delays of a network. The person must expect a response promptly to the data entry. This should be similar to the documents that are created locally. The vital lag to see the alterations entered as typed highlights the frustration.

Example of this could include the usage of SharePoint for managing the Word documents along with the version control. This is helpful for those forced to the corporate Windows environments (Liu, Pan & Xue, 2014). Here the SharePoint installation is paid for the task.  

3. Asynchronous critiquing of other participants' work:

The critiques could be batched and then to the individual who has been controlling the document. It is a practical solution preserving concerns regarding version control (Olariu, Zuber & Thorpe, 2017). Hence, few delays in time are tolerable here. This is because the proposed modifications are uploaded. This is same like uploading various attachments to any email message and little time is taken and often in seconds.

Examples of asynchronous editing could be any code running on the client. This indicates the web browser. The creation of a client script could typically be done. It sends the parameters to servers. This then performs the task of processing. Thus, in this case, the client never waits for the outcomes. Here a callback function could be utilized for returning the result.

4. Voting on serious issues: 

The systems can collect the votes in an asynchronous manner as they come. Short delays are tolerable after the vote is entered and then submitted. Results of voting need to be tabulated. Then it is broadcasted synchronously. As it is not done, the outcomes vary because of the delay in time. This proves exasperating if not chaotic (Pagadrai, Yilmaz & Valluri, 2016).

For example, the word-voters could be considered. Here the cost-effective designs by the augmented or modified sorting networks have been feasible. Thus in both the cases, the rich theory developed regarding the synthesis and analysis of the pipelined or parallel sorting networks benefits the design process directly (Boem et al., 2013).

Conclusion: 

It must be understood from the report that apart from the delays of propagation, the latency has also been involving the transmission delays and processing delays. With the view-point of the performance and speed of the network, the performance is understood through the bandwidth. The idea of bandwidth is the one that is advertised by the manufacturers of equipment of systems. The above report shows that since most of the people are familiar with the idea of bandwidth, the latency has been mattering equally to the experience of the end-users.

References:

Boem, F., Ferrari, R. M., Parisini, T., & Polycarpou, M. M. (2013, June). Distributed fault detection for uncertain nonlinear systems: A network delay compensation strategy. In American Control Conference (ACC), 2013 (pp. 3549-3554). IEEE.

Elahi, A., & Alfi, A. (2017). Finite-time $ ${{H} _ {infty}} $ $ H∞ stability analysis of uncertain network-based control systems under random packet dropout and varying network delay. Nonlinear Dynamics, 1-19.

Liu, L., Pan, F., & Xue, D. (2014). Fractional-order optimal fuzzy control for network delay. Optik-International Journal for Light and Electron Optics, 125(23), 7020-7024.

Mu, M., Stokking, H., & Den Hartog, F. (2017). Network delay and bandwidth estimation for cross-device synchronized media.

Olariu, C., Zuber, M., & Thorpe, C. (2017, May). Delay-based priority queueing for VoIP over Software Defined Networks. In Integrated Network and Service Management (IM), 2017 IFIP/IEEE Symposium on (pp. 652-655). IEEE.

Pagadrai, S., Yilmaz, M., & Valluri, P. (2016). Smart-grid backbone network real-time delay reduction via integer programming. IEEE transactions on neural networks and learning systems, 27(8), 1787-1792.