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Unformatted text preview: 3, along with brouters.
Routers determine the best logical path 21 Transport Layer
Responsible for managing the integrity
of a connection and controlling the
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
Defines the rules of a session.
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
Mechanisms for: Segmentation,
Controlling the flow of data,
Network service optimization. 23 Session Layer …cont.
The following protocols operate within the
◦ 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
◦ Simplex One-way direction communication
Half-duplex Two-way communication, but only one
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
Responsible for encryption and
compression. Thus, it acts as an
interface between the network and
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
It allows applications to communicate
with the protocol stack.
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- Winter '08