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Network Layers Naming and Addressing

For any network layer to perform its basic function, specifying the address of the destination is very important.

“Names” are user-defined and strings and addresses are binary, hex or decimal representations of the actual location of an application entity in a network. Mapping between the names and addresses is performed by a directory service which is a constituent of the Application layer.

The addressing scheme for the OSI model locating of the transport entity which has the access to the desired application entity through the session and presentation entities.

Network layer addressing specifies the structure of the global N-SAP address. The corresponding CCITT recommendation is X.213. The address structure is designed to enable definition of global network addresses which identify N-SAPs unambiguously.

The N-SAP addressing scheme is based on the concept of hierarchical addressing domains. This approach is similar to the telephone numbering scheme. A long distance telephone call number consists of the country code, exchange code and finally the subscriber’s number within the exchange. The country code divides the global domain of international numbers into domains, each of which is further divided into areas identified by their area codes.

The address structure consists of two major parts:

1. Initial Domain Part(IDP)
2. Domain Specific Part (DSP)

IDP is further divide into

1. Authority and Format Identifier (AFI)
2. Initial Domain Identifier (IDI)

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