Purpose of the OSI model What is the primary reason the OSI (Open Systems Interconnection) model was developed?

Introduction / Context:
The OSI model is a conceptual seven-layer framework created by ISO (International Organization for Standardization). It was developed to guide vendors and developers in building interoperable network protocols and to facilitate communication across heterogeneous networks.

Given Data / Assumptions:

• The model is intended as a guideline, not an actual protocol suite.
• It standardizes how different network systems should communicate.
• We are considering the broad purpose, not implementation details.

Concept / Approach:

The main purpose of the OSI model is interoperability. Before OSI, vendor-specific networking protocols made cross-network communication difficult. OSI introduced a layered structure to simplify protocol design and allow independent development of each layer. This abstraction supports compatibility across different hardware and software.

Step-by-Step Solution:

Verification / Alternative check:

ISO's official documentation confirms interoperability and vendor neutrality as the primary goals.

Why Other Options Are Wrong:

• Larger than DoD model: size comparison was not the purpose.
• Layer independence: a benefit, but not the main reason.
• Cisco adoption: Cisco did not create OSI.
• Replacement of TCP/IP: OSI never replaced TCP/IP; TCP/IP remains dominant.

Common Pitfalls:

• Believing OSI is a protocol suite; it is a model, not an implementation.

Final Answer:

To enable communication between different types of networks and vendors