Exercises 95 Requirements form the foundation upon which you develop the network architecture and design. Experience shows that the more effort you...

. Why is requirements analysis important to network architecture and design? Give three reasons. 2. Categorize each of the following requirements as core/fundamental, feature, or informational. a. Network must support Fast Ethernet and Gigabit Ethernet interfaces for all devices on the network. b. Network backbone should be upgradable in capacity to 10 Gb/s within two years of deployment. c. Finance department requires firewall protection to the server. d. Existing network consists of 10BaseT Ethernet and FDDI segments. e. Network personnel would like to be able to bill users for network service. f. Network core must not generate or terminate any user traffic. g. Network must support digital video traffic from remote video cameras, and may additionally support sound from these cameras. 3. Categorize each of the following requirements as user, application, device, or network. a. Database servers must run brand XYZ software. b. Teleconferencing requires at least 350 Kb/s capacity. c. Users must be able to submit print jobs of up to 25 MB in size. d. Each access network should be able to service 200 corporate users. 96 C H A P T E R 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. 5. Which customer requirements below could be categorized as mission-critical? As rate-critical? As real-time? As none of these? Give reasons for each choice. a. Processing telemetry data from a space shuttle launch, and providing that data to mission control during launch. (Customer: NASA.) b. Processing requests from automated teller machines throughout a city. (Customer: Bank.) c. Processing requests for Web pages from your servers. (Customer: Internet service provider.) 6. Give an example of a mission-critical application for each of these three environments: government, military, commercial. Why would each application be considered mission-critical? 7. Section 2.4.1 describes several types of delay (real-time, interactive burst, interactive 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