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This Concept Map, created with IHMC CmapTools, has information related to: OSI 7 Layers, Transport layer defines connection oriented and connectionless protocols at the message level. The Transport Layer can add information for synchronization, breaking messages into chunks, acknowledgement of receipt, timeouts and retransmission of data not acknowledged. The most common transport protocols are TCP and UDP. Session Layer includes reliability and adaptation such as failure detection and automatic recovery. The Session Layer is an enhancement of the Transport Layer and can add information for dialog control, synchronization, error recovery, and similar functions. The session and lower levels are all concerned with getting a bit stream across a connection reliably., Network Layer transfers packets between nodes using a protocol specific to the particular network. This may include setting up connections between routers. The Network Layer adds information that allows the receiver of a message to identify traffic that belongs to it and allows intermediate devices to route information to the proper destination. The most common form uses Internet Protocol, which uses IP addresses and ports to identify clients and servers. Each message contains the addresses and port numbers of both the client and the server as overhead. Presentation Layer includes encryption and such tasks as placement of fields in a display. The Presentation Layer is the lowest layer that is concerned with the meaning of the bits transmitted. It identifies collections of bits with identifiers so that they can be assigned meaning. Data can be collected into fields and records and assigned labels., Physical Layer specifies the circuits and hardware that carry electrical, light or electromagnetic signals between nodes. The physical layer just sends bits that might be encoded as different voltage layers for a specified instant of time on an electric wire or as pulses of light on a fiber optic line. There are many possible ways to distinguish a 1 or a 0 on a communications medium. Transport layer defines connection oriented and connectionless protocols at the message level. The Transport Layer can add information for synchronization, breaking messages into chunks, acknowledgement of receipt, timeouts and retransmission of data not acknowledged. The most common transport protocols are TCP and UDP.