The Designing for Cisco Internetwork Solutions (DESGN) Course version 1.2 is almost identical with version 1.1 in addition to general approaches and technologies for network design, it promotes Cisco solutions in designing and implementing scalable internetworks. Among specific goals is the promotion of the new modular approach to network design that has been intuitively used for the last few years and that Cisco now wants to formalize.
The early modular approaches to network design divided networks into access, distribution and core layers only, separately for the campus and the WAN part. The new Enterprise Composite Model facilitates designing, planning, implementing, operating and troubleshooting (PDIOT) networks by concentration on a certain module and on relations between the modules. Taking into account that most network solutions today (e.g. voice, video, storage networking, content networking) are typically overlay solutions spanning several modules, the composite modular approach seems even more relevant and is the main focus of this course.
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