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    • Network simulation assignment question

      P

      Consider a network with three laptop computers. Computer 1 sends packets to computer 3 using wireless links. The two possibilities are: computer 1 sends directly to 3, or sends to 2 and 2 sends to 3. Based on the distances between the computers, we assume in this model that the Bit Error Rate (BER) for the link (1,2) and (2,3), respectively is denoted as BER(1,2), BER(2,3), and is equal to BER(1,2) = BER(2,3)=1/10*BER(1,3).
      Assume further that the packets that are received in error are retransmitted and are not removed from the head of the queue until correctly received. Assume computer 1 has to transmit a file that contains 10000 packets. Simulate the system and determine average end-to-end transmission delay for a correct reception for a packet at the destination, and the cumulative distribution function for the end-to-end delay for the two cases considered. For this file transfer application, in order to determine the end-to-end delay, you may consider that the file (all packets) is created at the beginning of the simulation (time 0), and the acknowledgement for a correctly received packet is instantaneous.

      CS432 - Network Modeling and Simulation
    • Cs 432 assignment 1 solution

      Esha Naeem

      Fall 2020_CS432_1.docx

      CS432 - Network Modeling and Simulation
    • CS432 Assignment 1 Solution and Discussion

      M

      Re: CS432 Assignment 1 Solution and Discussion

      Assignment No. 01
      Semester: Spring 2020
      CS432 –Network modeling and simulation Total Marks: 20

      Due Date: 21/05/2020
      Assignment Objectives:
      • To enhance the knowledge of use cases as part of simulation building process
      • To improve the learning of creation of the project in Omnet ++ simulation tool.

      Uploading instructions:
      • Your assignment must be in .doc format (Any other formats like scan images, PDF, bmp, etc will not be accepted).
      • No assignment will be accepted through email.

      Rules for Marking:

      It should be clear that your assignment will not get any credit if:
      • The assignment is submitted after due date.
      • The submitted assignment does not open or file is corrupted.
      • Your assignment is copied from internet, handouts or from any other student
      (Strict disciplinary action will be taken in this case).

      Assignment

      Question No. 1 [Marks: 10]

      You are required to install OMNET++ in your system and write down all installation steps.
      When installation is completed, do the following tasks:

      • Open OMNET++ IDE.
      • Create a new empty project.
      • Give your VUID as project name.
      • After creation of project takes a snapshot of the newly created project, in which your VUID is shown as project name.

      Sample of snapshot is given as under.

      Note: Installation guide is available in download section on VULMS.

      Question No. 2 [Marks: 10]

      Following is a XYZ University Registration System’s use case. You are required to identify and define the Simulation Building Process activities (Entities, states, Events) of given use case.

      Deadline: Your assignment must be uploaded/submitted on or before 21st May 2020.

      CS432 - Network Modeling and Simulation
    • CS432 Assignment 1 Solution and Discussion

      zareen

      Assignment No. 01
      Semester: Fall 2019
      CS432 –Network modeling and simulation Total Marks: 20

      Due Date: 14th November, 2019
      Assignment Objectives:

      • To provide understanding about simulation models and
      • How to install the network simulator “Omnetpp”

      Uploading instructions:

      • Your assignment must be in .doc format (Any other formats like scan images, PDF, bmp,etc will not be accepted).
      • Save your assignment with your ID (e.g. bc020200786.doc).
      • No assignment will be accepted through email.

      Rules for Marking:

      It should be clear that your assignment will not get any credit if:
      • The assignment is submitted after due date.
      • The submitted assignment does not open or file is corrupted.
      • Your assignment is copied from internet, handouts or from any other student
      (Strict disciplinary action will be taken in this case).

      Assignment

      Question No. 1 [Marks: 10]

      a) You are required to install Omnet++ Simulator by providing detail of all the necessary steps.

      b) Omnet++ IDE has many built in examples of simulations.
      You are required to open and run any available example of TicToc by providing screen shots of each step (at least two screen shots including opening and running that example).

      Note: Installation guide is available in download section on VULMS.
      Question No. 2 [Marks: 10]

      Simulation is one of the most significant technologies in the world that provides us the facility to get a virtual environment that behaves like a real environment without having expensive hardware and software. For this purpose we have various types of networking tools or simulators.

      You are required to make comparison between the Omnet++ and NS3 simulators. Provide at least five points for each of the mentioned simulators.

      Note: Your answer should be very concise and concrete. Avoid providing unnecessary detail.

      Deadline: Your assignment must be uploaded/submitted on or before 14th November, 2019.

      CS432 - Network Modeling and Simulation
    • CS432 Assignment 3 Solution and Discussion

      zareen
      Assignment No. 03

      Semester: Fall 2019
      CS432 –Network modeling and simulation Total Marks: 20

      Due Date: 22 Jan, 2020
      Assignment Objective:

      • To enhance the leaning capability of the students by using “Built-in Package/ Framework and Routing Protocols”

      Uploading Instructions:

      • Your assignment must be in .doc format (Any other formats like scan images, PDF, bmp, etc will not be accepted).
      • Save your assignment with your ID (e.g. bc020200786.doc).
      • No assignment will be accepted through email.

      Rules for Marking:

      It should be clear that your assignment will not get any credit if:

      • The assignment is submitted after due date.
      • The submitted assignment does not open or file is corrupted.
      • Your assignment is copied from internet, handouts or from any other student. Strict disciplinary action will be taken in this case.

      Assignment

      Question No. 1 [Marks: 10]

      Network can be represent via graph G by considering the network devices like routers as nodes N and links as edges E i.e. G=(N, E) shown in the following figure.
      a0f35f16-3ca5-409d-bce8-af592e923e93-image.png

      You are required to provide solution for the following tasks:

      Set of all nodes. Set of all links or edges. Shortest path from A to D. Longest path from A to D with no cycle.

      Question No. 2 [Marks: 10]

      a. Which built-in module is used for routing in OMNeT++? Also import this module in existing projects of OMNeT++ by providing step by step detail of all the procedures.

      b. Run any built-in example of routing algorithm by providing the screen shot.

      Deadline: Your assignment must be uploaded/submitted on or before 22 Jan 2020

      CS432 - Network Modeling and Simulation
    • CS432 Assignment 2 Solution and Discussion

      zareen

      Assignment No. 02
      Semester: Fall 2019
      CS432 –Network modeling and simulation Total Marks: 20

      Due Date: 5thDecember, 2019
      Assignment Objectives:

      • To enhance the capabilities of network topologies on the network.
      • To calculate the latency and jitter of the network.

      Uploading instructions:

      • Your assignment must be in .doc format (Any other formats like scan images, PDF, bmp etc will not be accepted).
      • Save your assignment with your ID (e.g. bc020200786.doc).
      • No assignment will be accepted through email.

      Rules for Marking:

      It should be clear that your assignment will not get any credit if:
      • The assignment is submitted after due date.
      • The submitted assignment does not open or file is corrupted.
      • Your assignment is copied from internet, handouts or from any other student
      (Strict disciplinary action will be taken in this case).

      Assignment

      Question No. 1 [Marks: 5]

      Following network shows the data transmission between LAN1 host and LAN2 Host. Number of packets is sent from LAN1 to LAN2. You are required to calculate the Latency and Jitter during the data transmission.
      e68f25c2-d54a-4bdb-a632-0775b0f092f9-image.png

      Values should be given in the following table with complete calculation (formula and answers).
      Also write down the main difference between latency and jitter.

      Packet ID Time AT Point A Time AT Point B Latency Jitter 1 TA1= 3 sec TB2= 6 sec L1=? — 2 TA2 = 7 sec TB2 = 12 sec L2=? J1 =? 3 TA3 = 15 sec TB3 = 22 sec L3=? J2 =?

      Question No. 2 [Marks: 5]

      Suppose a university has a ‘Research center” network that is comprised of the main departments of the university. Answer the following questions by considering the topology of the given network.

      b896f385-5391-42a2-9884-f50cce0a3018-image.png

      What is the total data rate of the network?

      Which application is generating the maximum load per user in Management department?

      Which application is generating the minimum load per user in Computer Science department?

      Which department is consuming maximum network bandwidth and why?

      Question No. 3 [Marks: 5]
      Suppose the utilization of a system is 45% then what will be the queue depth?
      Question No. 4 [Marks: 5]
      What are the steps required in step-wise approach to measure the downtime cost of the system? Discuss them.

      Deadline: Your assignment must be uploaded/submitted on or before 5th December, 2019.

      CS432 - Network Modeling and Simulation

    SOLVED CS432 Assignment 2 Solution and Discussion

    CS432 - Network Modeling and Simulation
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    • zareen
      zareen Cyberian's Gold last edited by

      Assignment No. 02
      Semester: Fall 2019
      CS432 –Network modeling and simulation Total Marks: 20

      Due Date: 5thDecember, 2019
      Assignment Objectives:

      • To enhance the capabilities of network topologies on the network.
      • To calculate the latency and jitter of the network.

      Uploading instructions:

      • Your assignment must be in .doc format (Any other formats like scan images, PDF, bmp etc will not be accepted).
      • Save your assignment with your ID (e.g. bc020200786.doc).
      • No assignment will be accepted through email.

      Rules for Marking:

      It should be clear that your assignment will not get any credit if:
      • The assignment is submitted after due date.
      • The submitted assignment does not open or file is corrupted.
      • Your assignment is copied from internet, handouts or from any other student
      (Strict disciplinary action will be taken in this case).

      Assignment

      Question No. 1 [Marks: 5]

      Following network shows the data transmission between LAN1 host and LAN2 Host. Number of packets is sent from LAN1 to LAN2. You are required to calculate the Latency and Jitter during the data transmission.
      e68f25c2-d54a-4bdb-a632-0775b0f092f9-image.png

      Values should be given in the following table with complete calculation (formula and answers).
      Also write down the main difference between latency and jitter.

      Packet ID Time AT Point A Time AT Point B Latency Jitter
      1 TA1= 3 sec TB2= 6 sec L1=? —
      2 TA2 = 7 sec TB2 = 12 sec L2=? J1 =?
      3 TA3 = 15 sec TB3 = 22 sec L3=? J2 =?

      Question No. 2 [Marks: 5]

      Suppose a university has a ‘Research center” network that is comprised of the main departments of the university. Answer the following questions by considering the topology of the given network.

      b896f385-5391-42a2-9884-f50cce0a3018-image.png

      1. What is the total data rate of the network?

      2. Which application is generating the maximum load per user in Management department?

      3. Which application is generating the minimum load per user in Computer Science department?

      4. Which department is consuming maximum network bandwidth and why?

      Question No. 3 [Marks: 5]
      Suppose the utilization of a system is 45% then what will be the queue depth?
      Question No. 4 [Marks: 5]
      What are the steps required in step-wise approach to measure the downtime cost of the system? Discuss them.

      Deadline: Your assignment must be uploaded/submitted on or before 5th December, 2019.

      Hamna Hashmi zareen 3 Replies Last reply Reply Quote 0
      • zareen
        zareen Cyberian's Gold @zareen last edited by zareen

        Q.1 Solution:

        Packet ID Time AT Point A Time AT Point B Latency Jitter
        1 TA1= 3 sec TB2= 6 sec L1=TB1–TA1=> 6-3 = 3 sec —
        2 TA2 = 7 sec TB2 = 12 sec L2=TB2–TA2=> 12-7 = 5 sec J1 = L2-L1=> 5-3 = 2 sec
        3 TA3 = 15 sec TB3 = 22 sec L3=TB3–TA3=> 22-15 = 7 sec J2 = L3-L2=> 7-5 = 2 sec

        Latency is a term used to outline the amount of time it takes for a packet to transfer to its destination.
        Whereas, jitter is the delay that varies over time when the signal weakens.

        Q.2 Solution:

        1. What is the total data rate of the network?
          Answer: 3054 Kbps

        2. Which application is generating the maximum load per user in Management department?
          Answer: Application 3

        3. Which application is generating the minimum load per user in Computer Science department?
          Answer: Application 4

        4. Which department is consuming the more network bandwidth and why?
          Answer: Math department is consuming the network bandwidth more because there are total 8 applications that are running in Math department.

        Q. 3 Suppose the utilization of a system is 45% then what will be the queue depth?

        Q.3 Solution:
        Queue depth = utilization / (1-utilization)
        = 45/(1-45)
        = 45/-44
        = -1.0227

        Question No. 4
        Write down the five steps of step-wise approach to measure the downtime cost of the system.
        Q.4 Solution:
        Step-wise approach to measure downtime cost
        i) Identify Business Continuity Components
        ii) Define What You Protect
        iii) Prioritize Business Functions
        iv) Classify Outage Types,
        v) Calculate cost

        1 Reply Last reply Reply Quote 0
        • zareen
          zareen Cyberian's Gold @Hamna Hashmi last edited by

          Typical, approximate, values for latency that you might experience include:

          • 800ms for satellite
            120ms for 3G cellular data
            60ms for 4G cellular data which is often used for 4G WAN and internet connections
            20ms for an mpls network such as BT IP Connect, when using Class of Service to prioritise traffic
            10ms for a modern Carrier Ethernet network such as BT Ethernet Connect or BT Wholesale Ethernet in the UK

          Ideas Solution provided, if you are unable to solve please contact in chat Room

          1 Reply Last reply Reply Quote 0
          • zareen
            zareen Cyberian's Gold @zareen last edited by zareen

            Q.1 Solution:

            Packet ID Time AT Point A Time AT Point B Latency Jitter
            1 TA1= 3 sec TB2= 6 sec L1=TB1–TA1=> 6-3 = 3 sec —
            2 TA2 = 7 sec TB2 = 12 sec L2=TB2–TA2=> 12-7 = 5 sec J1 = L2-L1=> 5-3 = 2 sec
            3 TA3 = 15 sec TB3 = 22 sec L3=TB3–TA3=> 22-15 = 7 sec J2 = L3-L2=> 7-5 = 2 sec

            Latency is a term used to outline the amount of time it takes for a packet to transfer to its destination.
            Whereas, jitter is the delay that varies over time when the signal weakens.

            Q.2 Solution:

            1. What is the total data rate of the network?
              Answer: 3054 Kbps

            2. Which application is generating the maximum load per user in Management department?
              Answer: Application 3

            3. Which application is generating the minimum load per user in Computer Science department?
              Answer: Application 4

            4. Which department is consuming the more network bandwidth and why?
              Answer: Math department is consuming the network bandwidth more because there are total 8 applications that are running in Math department.

            Q. 3 Suppose the utilization of a system is 45% then what will be the queue depth?

            Q.3 Solution:
            Queue depth = utilization / (1-utilization)
            = 45/(1-45)
            = 45/-44
            = -1.0227

            Question No. 4
            Write down the five steps of step-wise approach to measure the downtime cost of the system.
            Q.4 Solution:
            Step-wise approach to measure downtime cost
            i) Identify Business Continuity Components
            ii) Define What You Protect
            iii) Prioritize Business Functions
            iv) Classify Outage Types,
            v) Calculate cost

            1 Reply Last reply Reply Quote 0
            • zareen
              zareen Cyberian's Gold @zareen last edited by

              @zareen said in CS432 Assignment 2 Solution and Discussion:

              latency

              Latency is sometimes considered the time a packet takes to travel from one endpoint to another, the same as the one-way delay.

              More often, latency signifies the round-trip time. Round-trip time encompasses the time it takes for a packet to be sent plus the time it takes for it to return back. This does not include the time it takes to process the packet at the destination.

              Network monitoring tools can determine the precise round-trip time on a given network. Round-trip time can be calculated from the source since it tracks the time the packet was sent and computes the difference upon acknowledgement of return. However, a delay between two endpoints can be difficult to determine, as the sending endpoint does not have information on the time of arrival at the receiving endpoint.

              zareen 1 Reply Last reply Reply Quote 0
              • zareen
                zareen Cyberian's Gold @zareen last edited by

                @zareen
                Jitter Calculation
                Here’s an example. We have collected 5 samples with the following latencies: 136, 184, 115, 148, 125 (in that order). The average latency is 142 - (add them, divide by 5). The ‘Jitter’ is calculated by taking the difference between samples.

                136 to 184, diff = 48
                184 to 115, diff = 69
                115 to 148, diff = 33
                148 to 125, diff = 23
                (Notice how we have only 4 differences for 5 samples).
                The total difference is (48+69+33+23=173) - so the jitter is 173 / 4, or 43.25.

                We use this same mechanism no matter how many samples you have - it works on 5, 50 or 5000.

                1 Reply Last reply Reply Quote 0
                • zareen
                  zareen Cyberian's Gold @zareen last edited by zareen

                  @zareen said in CS432 Assignment 2 Solution and Discussion:

                  jitter

                  Before we go please understand the jitter.
                  Jitter is the amount of variation in latency/response time, in milliseconds. Reliable connections consistently report back the same latency over and over again. Lots of variation (or ‘jitter’) is an indication of problems.

                  Jitter shows up as different symptoms, depending on the application you’re using. Web browsing is fairly resistant to jitter, but any kind of streaming media (voice, video, music) is quite suceptible to Jitter.

                  Jitter is a symptom of other problems. It’s an indicator that there might be something else wrong. Often, this ‘something else’ is bandwidth saturation (sometimes called congestion) - or not enough bandwidth to handle the traffic load.

                  zareen 1 Reply Last reply Reply Quote 0
                  • zareen
                    zareen Cyberian's Gold @Hamna Hashmi last edited by zareen

                    @Hamna-Hashmi said in CS432 Assignment 2 Solution and Discussion:

                    @zareen iska solution provide kar dain

                    Please check in Post!

                    1 Reply Last reply Reply Quote 0
                    • zaasmi
                      zaasmi Cyberian's Gold @Hamna Hashmi last edited by zareen

                      @Hamna-Hashmi available!

                      1 Reply Last reply Reply Quote 0
                      • Hamna Hashmi
                        Hamna Hashmi @zareen last edited by

                        @zareen iska solution provide kar dain

                        zaasmi zareen 3 Replies Last reply Reply Quote 1
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