Essay on Networking and Telecommunications: Logical vs. Physical Designs

When referring to a 'logical' network we are talking about the logical addressing used to describe the network itself or the networks it connects to. Logical design is the design we're all familiar with: how classes relate to one another, both structurally and behaviorally. Physical design, however, is where those classes reside, and it's something many developers don't think about.

The logical design is more conceptual and abstract than the physical design. In the logical design, we look at the logical relationships among the objects. In the physical design, we look at the most effective way of storing and retrieving the objects as well as handling them from a transportation and backup/recovery perspective (Ben, 2004).

The process of logical design involves arranging data into a series of logical relationships called entities and attributes. An entity represents a chunk of information. In relational databases, an entity often maps to a table. An attribute is a component of an entity that helps define the uniqueness of the entity. In relational databases, an attribute maps to a column (Ben, 2004).

The logical database design is the model of valuable information. It describes the information itself and the relationships between information. The kind of relationships is not limited, because any limitation would affect the structure of information.

The logical design is most commonly expressed in a class diagram, which is a partial view on the whole design. The resulting artifacts of the logical design are persistent classes and the associations between classes, as well as the essential constraints on the data (Andrew, 2002).
The logical database design handles the information view on the enterprise. It contains most important information in the enterprise as well as the associations between information. As a difference to the conceptual database design, logical database design does not contain the process itself, because the process is further evolved in the application design......................

ESSAYS ON TECHNOLOGY