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A cellular operator needs a database to keep track of its customers, their subscription plans, and the handsets (mobile phones) that they are using. The E- R diagram in Figure 2-24 illustrates the key entities of interest to the operator and the relationships between them. Based on the figure, answer the following questions and explain the rationale for your response. For each question, identify the element(s) in the E-R diagram that you used to determine your answer. a. Can a customer have an unlimited number of plans? b. Assume a handset type exists that can utilize multiple operating systems. Could this situation be accommodated within the model included in Figure 2-24? c. Is the company able to track a manufacturer without maintaining information about its handsets?

A cellular operator needs a database to keep track of its customers, their subscription plans, and the handsets (mobile phones) that they are using. The E- R diagram in Figure 2-24 illustrates the key entities of interest to the operator and the relationships between them. Based on the figure, answer the following questions and explain the rationale for your response. For each question, identify the element(s) in the E-R diagram that you used to determine your answer. a. Can a customer have an unlimited number of plans? b. Assume a handset type exists that can utilize multiple operating systems. Could this situation be accommodated within the model included in Figure 2-24? c. Is the company able to track a manufacturer without maintaining information about its handsets?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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t e n in ut Is responsible for Family member Customer Belongs Plan нө Includes но Manufacturer Handset Plan Type FIGURE 2-24 Diagram for Problem and Exercise 2-23 Handset Type F Operating System
Transcribed Image Text:t e n in ut Is responsible for Family member Customer Belongs Plan нө Includes но Manufacturer Handset Plan Type FIGURE 2-24 Diagram for Problem and Exercise 2-23 Handset Type F Operating System
A cellular operator needs a database to keep track of its customers, their subscription plans, and the handsets (mobile phones) that they are using. The E- R diagram in Figure 2-24 illustrates the key entities of interest to the operator and the relationships between them. Based on the figure, answer the following questions and explain the rationale for your response. For each question, identify the element(s) in the E-R diagram that you used to determine your answer. a. Can a customer have an unlimited number of plans? b. Assume a handset type exists that can utilize multiple operating systems. Could this situation be accommodated within the model included in Figure 2-24? c. Is the company able to track a manufacturer without maintaining information about its handsets? d. Can the same operating system be used on multiple handset types? e. There are two relationships between Customer and Plan. Explain how they differ.
Transcribed Image Text:A cellular operator needs a database to keep track of its customers, their subscription plans, and the handsets (mobile phones) that they are using. The E- R diagram in Figure 2-24 illustrates the key entities of interest to the operator and the relationships between them. Based on the figure, answer the following questions and explain the rationale for your response. For each question, identify the element(s) in the E-R diagram that you used to determine your answer. a. Can a customer have an unlimited number of plans? b. Assume a handset type exists that can utilize multiple operating systems. Could this situation be accommodated within the model included in Figure 2-24? c. Is the company able to track a manufacturer without maintaining information about its handsets? d. Can the same operating system be used on multiple handset types? e. There are two relationships between Customer and Plan. Explain how they differ.
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