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This Concept Map, created with IHMC CmapTools, has information related to: ch3 osi 7 layers, The seven OSI Layers include Application Layer defines the communication needs of specific applications such as FTP or HTTP. While the Application Layer was originally designed to contain a collection of standardized network applications like electronic mail and file transfer, it has become a general purpose container for applications and protocols that do not fit into the lower layers. It lacks a clear separation between applications, application specific protocols, and general purpose protocols such as File Transfer Protocol., The seven OSI Layers include 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., The seven OSI Layers include 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., The seven OSI Layers include 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., The seven OSI Layers include 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., The seven OSI Layers include 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., The seven OSI Layers include Data Link Layer manages the transfer of packets between nodes connected by a physical link. The Data Link layer groups bits into frames or other units and adds additional bits of information to group the bits, indicate the beginning and end of a character, assign sequence numbers for ordering, and provide for error detection and correction with parity and checksums. Sequence numbers, parity bits and checksums are all examples of overhead.