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icang [17]
3 years ago
13

General Hardware Products Your boss, the IT director, wants you to explain FDDs, BPM, DFDs, and UML to a group of company manage

rs and users who will serve on a systems development team for the new marketing system
1. Explain how an FDD can be used in requirements modeling.
2. Describe BPM and how it can be used.
3. Explain how DFDs can be used in requirements modeling.
4. Describe the UML and how it can be used during systems development.
Computers and Technology
1 answer:
Bas_tet [7]3 years ago
3 0

Answer:

1. FDD is a process and Analysts can use a FDD to create and use business functions and processes. It Requirements models are used when gathering requirements for a new system.

2. BPM is used on an ongoing basis for business process improvement. It is meant to improve order, insight and efficiency of the collective workflows that make up any given business process. BPM is meant to reduce any chaos within those collective workflows that make up a process and eliminate ad hoc workflow management. BPM means Business Process Management.

3. DFDs stands for Data Flow Diagram which will help software developers and designers to understand how they can take their next step to fit into the overall business process. DFDs paly key role for a successful requirements modeling.

4. UML can be used for modeling a system independent of a platform language. UML is a graphical language for visualizing, specifying, constructing, and documenting information about software-intensive systems. UML gives a standard way to write a system model, covering conceptual ideas.

Explanation:

Functional decomposition diagram (FDD) is used to identify functions and define their structure. It is a technique to decompose the complex problem into manageable pieces or individual elements to develop the application or product.

DFDs: It contains a process (shape) that represents the system to model, in this case, the "Food Ordering System". It also shows the participants who will interact with the system, called the external entities. In this example, Supplier, Kitchen, Manager and Customer are the entities who will interact with the system.

Unified Modeling Language (UML): Edraw UML Diagram is the application of choice for many software engineers and designers. The software is fully compatible with 64 and 32-bit Windows platforms from Windows XP to Windows 10.

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3 years ago
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Consider the following schema for customer: (id, name, street, city, state, zip, phone), in which customers are uniquely determi
Art [367]

Answer:

Super key is a set of attributes that uniquely identifies all attributes in a relation.Super keys are more than candidate key.

Explanation:

For example in the given schema where

Customer: (id , name , street , city,state,zip,phone)

We have a relation we check super keys by following dependencies

Functional Dependencies                          Super Key

id                                                                     YES

name                                                               YES

id , name -> street , city,state,zip,phone       YES

id , street  ->name , city,state,zip,phone       YES

id,city ->name , street ,state,zip,phone         YES

id,state ->name , street ,city,zip,phone         YES

id,phone  ->name , street ,state,zip,city        YES

id , name , street                                             YES

id , name , street , city                                    YES

id , name , street , city,state                          YES

id , name , street , city,state,zip,phone         YES

All these are uniquely identified

All these are super key but in reverse they are not super key such as

street , city,state,zip,phone->id , name        No

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Answer:

MAC Addresses (Destination and Source MAC address)

Explanation:

A switch has 3 primary functions:

  • Forward frames
  • Learn addresses
  • Avoid loops

An Ethernet frame has the header, data and trailer and there are two specific fields in the header that helps the switch to know where to send data in future transmissions.

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every Ethernet frame has this and when the frame hits a switch or any device, any device can look at it ( an Ethernet frame ) and know where it is suppose to go and where it came from.

Every switch has a MAC address table where it stores MAC addresses of different computers on the network.

Example:

When a PC1 sends a frame to PC2 through a switch, the switch looks at the header of the Ethernet frame for the source mac address and adds the source MAC address to its MAC address table and also the port that it came through.

simply put:

A switch looks at the source MAC address to see if it knows it already, if it does. Great! no need to add it again to it's address table.

If it doesn't, it adds it's source address and the port that the frame came from.

This basically how the switch populates its MAC address table.

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