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BN208 Networked Applications: Major Assignment Replacing Final Exam
This Semester (T2 2020) face-to-face “Final Examination” has been substituted with an “Exam- like” major assessment. Students are required to follow the assessment specifications provided and submit their work on the Moodle Shell in the stipulated time.
BN208 Networked Applications – Final Assessment Answer
Question 1- Analyze Performance [Total = 10 Marks]
- What are the functions of sockets in networked applications? Explain your answer with a case scenario where you are receiving 10 packets from a How will the socket perform its role? [5 Marks]
- YouTube is an example of a stored multimedia type application, discuss the challenges and solutions of YouTube while playing multimedia (audio/video) based stored content. Justify your answer with an example (playing a stream and taking screenshots to explain).[5 Marks]
QUESTION 2 – Socio-Technical contexts [Total = 10 Marks]
- Social synergy arises when people are working together to co-create each other’s outcomes. Discuss, with examples, how socio-technical systems can facilitate the provision of positive and negative synergies for their participants.[5 Marks]
- Discuss both (i) Network Reliability, and (ii) Resilience challenges that the Internet faces as a socio-technical system.[5 Marks]
QUESTION 3 – Multimedia Applications, VoIP [Total = 10 Marks]
- You are required to design a VoIP Discuss the requirements for such an application in terms of its protocols and performance requirements. What types of protocols you would need to design a complete VoIP application (Hint: real-time streaming protocols and signalling protocols, etc.)?[5 Marks]
- Discuss the architecture of WhatsApp in terms of its protocols. Address and discuss all the essential protocols used by WhatsApp for communication. [5 Marks]
QUESTION 4 – Overlay Networks [Total = 10 Marks]
- Why is Software Defined Networks (SDN) considered an overlay network? Justify your answer with examples of some well-known overlay networks. [5 Marks]
- Discuss the key challenges in SDN? How will you migrate from a traditional network to an SDN based network? Justify your answer with examples.[5 Marks]
QUESTION 5 – Middleware, QoS [Total = 15 Marks]
You are required to design a QoS architecture video-conferencing application. Firstly, you will need to elaborate on the QoS requirements of your application, and then you are required to provide an application design based on Integrated Services (IntServ) and Differentiated Services (DiffServ). The design must include how you can provide these services to your application over network devices (local routers, core networks and switches, etc.). After presenting the design, state your opinion which QoS architecture is easier to implement over the network for your application. [7 (IntServ)+7 (DiffServ)+1 (opinion) =15 Marks]
QUESTION 6 – Case Study [Total = 10 Marks]
The Cisco Network Analysis Module (NAM) is an integrated traffic monitoring service module that occupies a single slot in the chassis of the Cisco Catalyst® 6500 Series Switch. It gives Cisco network administrators full application-layer visibility, providing this information to the network engineer using a browser from any point on the network. After it is installed, the NAM enables both real-time and historical application monitoring, including data and voice. With proactive monitoring capabilities, it is easy to capture and decode packets, analyze trends, isolate network problems, and find application response delays before they occur. New VoIP and QoS monitoring capabilities let administrators analyze IP telephony sessions and validate QoS policies.
Remote Monitoring (RMON) data helped provide real-time traffic information, and the Cisco Catalyst 6500 Series exports limited RMON data – but not enough data. “To get all the RMON data from the Cisco Catalyst 6500 Series including backplane traffic – we needed the NAM. NAM gives us voice and data, along with switching statistics. It collects information 24 hours a day, seven days a week, on all ports. Competitive solutions would plug into a single port, or, if they saw passing data, they couldn’t decipher what port it was coming in on.” With NAM modules deployed across the Cisco data centre network, the Cisco team has an impressive view of network traffic and what goes on. The list of applications they can monitor is exceptional. Administrators can look at customer relationship management applications like Siebel and Oracle, as well as front-end Web applications like Oracle WebForms. As more applications have Web interfaces, NAM’s capabilities are more crucial, because they allow administrators to look at enterprise Web communication and behaviour. Cisco also uses NAM monitoring for IP telephony, checking the data layer for problems.
In the data centre, NAM is essential when monitoring content switching. Ng describes Cisco IT moving toward content farms in the data centres and the advantages of NAM in that environment: “Traditionally, there’s been a standalone Web server. From the standalone server, Web servers were load-balanced to scale Web applications. Next, you take specific content and use multiple servers, make a farm out of it. If you’re looking for video, you go to a video farm, for example. In the next year, our content will be spread across content farms. We’ll take the Web servers and break them down into more specific pieces. By then, our content will be distributed in a wide range, segregated by both data and content type. When you go to this kind of distributed architecture, the NAM can play a crucial role, because it can look at different applications between servers. Because the network plays a crucial role in this kind of distribution when you’ve got farms of machines, network analysis is more important. We need to understand how they connect and communicate, and NAM will let us.”
In addition, the Cisco team also uses NAM for collecting RMON-1 and 2 port statistics remotely, without requiring a separate RMON probe. Similar to Simple Network Management Protocol (SNMP), RMON takes traps and reports on the data performance across the wire between devices from Layer 2 through Layer 7, enabling administrators to see all seven layers of data on the Layer 2 network where NAM is installed. Because NAM can look at all seven layers of traffic on the backplane of the device in which it is installed, NAM can see more than what is running on the wire: it can look at traffic on the wire between two devices to analyze performance, on the wire, between devices. NAM can also use NetFlow records to monitor applications, hosts, and application conversations for more visibility into the business of the network.
Source: https://www.cisco.com/c/en/us/about/cisco-on-cisco/enterprise- networks/network-analysis-module-web.html
- Justify how the above Cisco module will achieve better performance and how it can help in network troubleshooting. [5 marks]
- How can VoIP applications benefit from NAM for high-quality service? Explain in detail. [5 marks]
|Marking Criteria and Description||Weightage|
|Q1||Students need to explain the performance analysis question with relevant reasoning and context of applicability. Also, in the second part of the question, students need to use the example of YouTube and explain as mentioned in the question.||10 marks|
|Q2||Student needs to analyse the socio-technical aspects in deploying network applications and in the second part of the question, students need to discuss the challenges briefly as mentioned in the question.||10 Marks|
|Q3||In the first part of the question, students need to present a design for VoIP application and design should explain the requirements for such an application in terms of its protocols and performance requirements. What types of protocols you would need to design a complete VoIP application? In the second part of the question, as an example, students need to discuss in detail the architecture of WhatsApp in terms of protocols.||10 Marks|
|Q4||In the first part of the question, students need to justify with examples that SDN is considered an overlay network. In the second part of the question, they are required to discuss important challenges SDN is facing. Also, students need to explain with examples of how to migrate a traditional network to SDN based architecture.||10 Marks|
|Q5||Students need to design QoS architecture for a video-conferencing application. 7 marks are for the discussion of suggested IntServ and 7 marks are for DiffServ, where they will also discuss the protocols these architectures will use. 1 mark is for the opinion of the student of which architecture is easy to implement for this application.||15 Marks|
|Q6||Part 1 answer should discuss how the Cisco module discussed in the case study will achieve better performance and how it can help in network troubleshooting.
In part 2, students will briefly explain for high-quality service how NAM is useful.
Marking Rubric: Use As You See Fit For Various Type Of Open-Ended Questions:
|Grade Mark||HD 80%+||DI 70-
|Identification||Demonstrated an excellent ability to think critically and sourced reference material appropriately||Demonstrated an excellent ability to think critically but did not source reference material
|Demonstrated ability to think critically and sourced reference material appropriately||Demonstrated ability to think critically but did not source reference material appropriately||Did not demonstrate the ability to think critically and did not source reference material
|Analyse||Logic is clear and easy to follow with strong arguments||Consistently logical and convincing||Mostly logical and convincing||Adequate cohesion and conviction||The argument is confused and disjointed|
Usability Design elements
|All elements are present and very well integrated||Components present with good cohesion||Components present and mostly well integrated||Most components present||The proposal lacks structure.|
|Evaluate/ Justification||Excellent use of credible sources. Accurate referencing.
|Extremely good effort||The good effort made but not outstanding||Made some effort. For example, Web searches only||Very little attempt to reference. Lack of effort with inaccuracies|
|References||Clear styles with an excellent source of references||Clear referencing style||Generally good referencing style||Sometimes clear referencing style||Lacks consistency with many errors|