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05.02.2021 •
Computers and Technology
A. Assume that in the same scenario as in Exxercise 3.2, there is an entity set called Purchase with attributes purchaseDate, total amount, and any others tou wish to add to describe book purchases. A purchase may include several books. Show how this entity set and its relationship to book would be represented on the E-R diagram.
b. Stating any necessary assumptions, make a decision about the cardinallity and participation constraints of the relationship, and add appropriate symbols to the E-R diagram.
c. Assume there is another entity called Seller to be added to the diagram. The book collector makes purchases from many sellers, but each purchase is made from one seller. amaking up attributes as needed, add this entity and appropriate relationship(s) to the diagram.
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Ответ:
Layered network architecture enables us a clear loosely coupled system with a definite distinction between the various layers visible.
Explanation:
Layered architecture enable independent deployment of each of the different layer, so that emphasis can be laid to the layers in respect of their protocol deployment.
TCP/IP is a standard model which is being followed everywhere, however the OSI is a conceptual model. The TCP/IP is actually derived from the OSI model.
Both the models differ in the number of layers present in them.
TCP/IP has 4 layers whereas OSI has 7 layers.