(Solved) : 112 Exercises 1 Example 13 Analogy Drawn Network S Architecture Design Home S Architecture Q41020103 (1) . . .

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1.12 Exercises 1. In Example 1.3, an analogy was drawn between a networks architecture and design and a homes architecture

96 CHAPTER 2 Requirements Analysis: Concepts 4. Give an example of a requirement as it flows from user to application to devi

1.12 Exercises 1. In Example 1.3, an analogy was drawn between a network’s architecture and design and a home’s architecture and design. Provide a similar analogy, using a computer’s architecture and design. 2. Hierarchy and interconnectivity are a fundamental trade-off in networks. Given the network hierarchy shown in Figure 1.30, with costs assigned to each link, show how interconnectivity would improve the performance of traffic flowing between Joe’s computer and Sandy’s computer. Costs are shown as numbers but could represent the capacity of each link or the costs incurred by using each link. What is the total cost of traveling the hierarchy between Joe’s computer and Sandy’s? In this figure, where would you add a link of cost 15 so that the total cost between Joe’s computer and Sandy’s is less than it is when you travel the entire hierarchy? 3. In Figure 1.9, connections are added between networks in the Internet to provide a better performing path for select traffic flows. An example of this is a content delivery network (CDN). What is a CDN? Show how a CDN uses interconnectivity to provide better performance characteristics to its users. In defining where services can be applied in a network, end-to-end is determined by where you want a service to start and stop. For example, if your WAN is supplied by a service provider (e.g., an ATM or frame relay service), you may want to define the end points and characteristics of that service. If you use IP routers at each LAN-WAN interface to that service, describe the following: (1) at which network devices would you define the end points of the service, and (2) what characteristics (service metrics) would you use to measure the service? 5. Service requirements flow from user to application to device to network, becoming more specific along the way. If you were given an application requirement for end-to-end delay (e.g., 100 ms) between an application server on one network and users on another network, for example, how might that translate into delay in the network and devices? What types of service metrics could you use to measure it? 96 CHAPTER 2 Requirements Analysis: Concepts 4. Give an example of a requirement as it flows from user to application to device to network. Show how it becomes more technical at each component. 6. Give an example of a mission-critical application for each of these three environ- ments: government, military, commercial. Why would each application be consid- ered mission-critical? 7. Section 24.1 describes several types of delay (real-time, interactive Durst, inter- active bulk, and asynchronous). Give examples of applications or traffic types that have each type of delay. 8. Delay performance is increasingly important in support of user and application requirements. Describe why delay is important for the following applications: Voice over IP (VOIP) • Non-buffered (real-time) video or audio playback • Teleconferencing 9. Based on the following application locations, develop an applications map using the template provided (see Figure 2.17). Campus LAN Building A External Building B Main Engineering Building ACOS Internet Building C OM Site Data Archival FIGURE 2.17 Template for Exercise 9 a. There is a distributed computing application between all compute servers. D. There is a data storage/access application between all compute servers and the storage servers in Main Engineering C. There is a data migration application between Main Engineering. Extemal Access Building, and Off-Site Data Archival. 10. which devices below can be considered generic computing devices? Servers? Specialized devices? a An ATM machine. b. Laptops running Linux OS. C. IBM computing Cluster of 128 PCs. d. Sun Enterprise 450 database server e. Desktop PC running Windows 2000 11. Add the following devices to the applications map developed in Problem 4. a Compute servers are located in Buildings A, B, and C (one server each), and five compute servers are located in Main Engineering b. Storage servers are located in Main Engineering (two servers), External Access Building (one server), and at the Off-Site Data Archival location (one server). 12. List the top 10 applications that you expect to use in your (or your customer’s) net- work, or that you Currently use in the existing network. List the actual or estimated performance characteristics for each application and try to place them into groups. You can also try to map them to the application groups listed in Section 24.2. Show transcribed image text 1.12 Exercises 1. In Example 1.3, an analogy was drawn between a network’s architecture and design and a home’s architecture and design. Provide a similar analogy, using a computer’s architecture and design. 2. Hierarchy and interconnectivity are a fundamental trade-off in networks. Given the network hierarchy shown in Figure 1.30, with costs assigned to each link, show how interconnectivity would improve the performance of traffic flowing between Joe’s computer and Sandy’s computer. Costs are shown as numbers but could represent the capacity of each link or the costs incurred by using each link. What is the total cost of traveling the hierarchy between Joe’s computer and Sandy’s? In this figure, where would you add a link of cost 15 so that the total cost between Joe’s computer and Sandy’s is less than it is when you travel the entire hierarchy? 3. In Figure 1.9, connections are added between networks in the Internet to provide a better performing path for select traffic flows. An example of this is a content delivery network (CDN). What is a CDN? Show how a CDN uses interconnectivity to provide better performance characteristics to its users. In defining where services can be applied in a network, end-to-end is determined by where you want a service to start and stop. For example, if your WAN is supplied by a service provider (e.g., an ATM or frame relay service), you may want to define the end points and characteristics of that service. If you use IP routers at each LAN-WAN interface to that service, describe the following: (1) at which network devices would you define the end points of the service, and (2) what characteristics (service metrics) would you use to measure the service? 5. Service requirements flow from user to application to device to network, becoming more specific along the way. If you were given an application requirement for end-to-end delay (e.g., 100 ms) between an application server on one network and users on another network, for example, how might that translate into delay in the network and devices? What types of service metrics could you use to measure it?
96 CHAPTER 2 Requirements Analysis: Concepts 4. Give an example of a requirement as it flows from user to application to device to network. Show how it becomes more technical at each component. 6. Give an example of a mission-critical application for each of these three environ- ments: government, military, commercial. Why would each application be consid- ered mission-critical? 7. Section 24.1 describes several types of delay (real-time, interactive Durst, inter- active bulk, and asynchronous). Give examples of applications or traffic types that have each type of delay. 8. Delay performance is increasingly important in support of user and application requirements. Describe why delay is important for the following applications: Voice over IP (VOIP) • Non-buffered (real-time) video or audio playback • Teleconferencing 9. Based on the following application locations, develop an applications map using the template provided (see Figure 2.17). Campus LAN Building A External Building B Main Engineering Building ACOS Internet Building C OM Site Data Archival FIGURE 2.17 Template for Exercise 9 a. There is a distributed computing application between all compute servers. D. There is a data storage/access application between all compute servers and the storage servers in Main Engineering C. There is a data migration application between Main Engineering. Extemal Access Building, and Off-Site Data Archival. 10. which devices below can be considered generic computing devices? Servers? Specialized devices? a An ATM machine. b. Laptops running Linux OS. C. IBM computing Cluster of 128 PCs. d. Sun Enterprise 450 database server e. Desktop PC running Windows 2000 11. Add the following devices to the applications map developed in Problem 4. a Compute servers are located in Buildings A, B, and C (one server each), and five compute servers are located in Main Engineering b. Storage servers are located in Main Engineering (two servers), External Access Building (one server), and at the Off-Site Data Archival location (one server). 12. List the top 10 applications that you expect to use in your (or your customer’s) net- work, or that you Currently use in the existing network. List the actual or estimated performance characteristics for each application and try to place them into groups. You can also try to map them to the application groups listed in Section 24.2.

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1.12 Exercises 1. In Example 1.3, an analogy was drawn between a networks architecture and design and a homes architecture

96 CHAPTER 2 Requirements Analysis: Concepts 4. Give an example of a requirement as it flows from user to application to devi

1.12 Exercises 1. In Example 1.3, an ... View full description