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2 Layer 2 (data link layer) 3 Network Topology. 4 Layer 2.5. 5 Layer 3 (Network Layer) 6 Layer 3+4 (Protocol Suites) ... SMB Server Message Block; SMPP Short Message ...
The Internet application layer maps to the OSI application layer, presentation layer, and most of the session layer. The TCP/IP transport layer maps to the graceful close function of the OSI session layer as well as the OSI transport layer. The internet layer performs functions as those in a subset of the OSI network layer.
MTP Level 3 is sometimes abbreviated MTP3; MTP Level 2, MTP2. [2] MTP and SCCP are together referred to as the Network Service Part (NSP). [3] There is no one-to-one mapping of MTP Levels 1 through 3 onto the OSI model. [4] Instead, MTP provides the functionality of layers 1, 2 and part of layer 3 in the OSI model. [5]
layers 3 Network: Packet: Structuring and managing a multi-node network, including addressing, routing and traffic control: 2 Data link: Frame: Transmission of data frames between two nodes connected by a physical layer 1 Physical: Bit, Symbol: Transmission and reception of raw bit streams over a physical medium
The SCCP Class 0 protocol class is the most basic of the SCCP protocol classes. Network Service Data Units passed by higher layers in the originating node are delivered by the SCCP to higher layers in the destination node. They are transferred independently of each other. Therefore, they may be delivered to the SCCP user out-of-sequence.
[7] DPI-enabled devices have the ability to look at Layer 2 and beyond Layer 3 of the OSI model. In some cases, DPI can be invoked to look through Layer 2-7 of the OSI model. This includes headers and data protocol structures as well as the payload of the message.
Network architecture is the design of a computer network.It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as communication protocols used.
The Remote Terminal Unit is initially interrogated with what DNP3 terms an "Integrity Poll" (a combined Read of Class 1, 2, 3 and 0 data). This causes the Remote Terminal Unit to send all buffered events and also all static point data to the Master station. Following this, the Master polls for the event data by reading Class 1, Class 2 or Class 3.