Lecture-3 ISO Model, Network Security, and Protocols

Routers are among the network hardware devices that

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Unformatted text preview: 3, along with brouters. Lecture-3 Routers determine the best logical path 21 Transport Layer Responsible for managing the integrity of a connection and controlling the session. Accepts a PDU from the Session layer and converts it into a segment. Controls how devices on the network are addressed or referenced, establishes communication connections between nodes. Defines the rules of a session. Lecture-3 22 Session rules specify how much data Transport Layer …cont. Establishes a logical connection between two devices and provides endto-end transport services to ensure data delivery. Mechanisms for: Segmentation, Sequencing, Error checking, Controlling the flow of data, Error correction, Multiplexing, and Lecture-3 Network service optimization. 23 Session Layer …cont. The following protocols operate within the Session layer: ◦ ◦ ◦ ◦ ◦ Secure Sockets Layer (SSL) Transport Layer Security (TLS) Network File System (NFS) Structured Query Language (SQL) Remote Procedure Call (RPC) Communication sessions can operate in one of three different discipline or control modes: ◦ ◦ Simplex One-way direction communication Half-duplex Two-way communication, but only one Lecture-3 direction can send data at a time 24 Presentation Layer Responsible for transforming data received from the application layer into a format that any system following the OSI model can understand. It imposes common or standardized structure and formatting rules onto the data. Responsible for encryption and compression. Thus, it acts as an interface between the network and Lecture-3 25 applications. Presentation Layer …cont. Format standards that exist within the Presentation layer: American Standard Code for Information Interchange (ASCII) Extended Binary-Coded Decimal Interchange Mode (EBCDIC) Tagged Image File Format (TIFF) Joint Photographic Experts Group (JPEG) Moving Picture Experts Group (MPEG) Musical Instrument Digital Interface (MIDI) Lecture-3 26 Application Layer Responsible for interfacing user applications, network services, or the operating system itself with the protocol stack. It allows applications to communicate with the protocol stack. The Appl...
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