Please help me interpret this Data Flow Diagram

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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Please help me interpret this Data Flow Diagram.

Physical Data Flow Diagram of Covid-19 Vaccine Administration Management System
Vaccination
Category
Master File
Master
Person
-New Person to be vaccinated-
Create New Record
Priority Category_
Selection of Category
Second Dose of Vaccination
Vaccinator's Name-
Vaccination
Update Record
Vaccinator Name
If First Dose of Vaccination-
Master File
If Second Dose of Vaccination
Date of First Dose of
Vaccination
Daily Report of Fully-Vaccinated
Individuals
Schedule for Second Dose of Vaccination
Reports
Ending-inventory of vaccines-
Master
Date/Schedule of second
dose of vaccination
Daily Report of Partially-Vaccinated
Individuals
Vaccine Inventory Report
Send Řeport
Inventory Control Unit
Transcribed Image Text:Physical Data Flow Diagram of Covid-19 Vaccine Administration Management System Vaccination Category Master File Master Person -New Person to be vaccinated- Create New Record Priority Category_ Selection of Category Second Dose of Vaccination Vaccinator's Name- Vaccination Update Record Vaccinator Name If First Dose of Vaccination- Master File If Second Dose of Vaccination Date of First Dose of Vaccination Daily Report of Fully-Vaccinated Individuals Schedule for Second Dose of Vaccination Reports Ending-inventory of vaccines- Master Date/Schedule of second dose of vaccination Daily Report of Partially-Vaccinated Individuals Vaccine Inventory Report Send Řeport Inventory Control Unit
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