APPLICATION LAYERGroup 7 > ITWD 111 A

CONTENTSITWD Report 7 > ApplicationLayer.pptx

PRELUDE

Understanding applications

ABOUTUnderstanding OSI application layer

COREWhat application layer is in networking

RECAPWhat the other layers of OSI are

PEOPLEin Group 7

SOFTWAREPrograms that tell the computer how to perform tasks

SYSTEMS SOFTWAREConsists of programs that interact with the computer at a very basic level

APPLICATIONS SOFTWAREPrograms catering to the user’s computing needs and relies on systems for existence

OS | compilers | PC utilities

E. G.

MS Office suite | gamesE. G.

APPLICATIONS

SYSTEMS

HARDWARE

FIGURE 1.1Systems are housed through the hardware. Applications run through the systems software.

APPLICATION LAYEREnd-user layer of the OSI networking model

COMMUNICATION PARTNERSIdentification

SERVICE QUALITYIdentification

USER AUTHENTICATION AND PRIVACYImplementation

FIGURE 1.2In application layer, there is providence of services on the Internet, giving access to file transfers, e-mailing, and directory services.

APPLICATION LAYERProtocols determining manner of data transmission

HTTPHypertext Transfer

FTPFile Transfer

POPPost-office

SMTPSimple Mail Transfer

SSLSecure Socket Layer

TelnetFor remote PCs

LAYERS OF THE OSI MODELNetworking blueprint for efficient data

transmissionDATA UNIT BitEXAMPLE(S) DSL, USB

Transmission and reception of raw bit streams over a physical medium

MEDIA HOST

DATA UNIT Bit/FrameEXAMPLE(S) PPP, L2TP

Reliable transmission of data frames between two nodes connected by a physical layer

DATA UNIT PacketEXAMPLE(S) IPv4, IPv6

Structuring and managing a multi-node network, including addressing and traffic control

DATA UNIT SegmentsEXAMPLE(S) TCP, UDP

Reliable transmission of data segments between points on a network,

DATA UNIT DataEXAMPLE(S) RPC, PAP

Exchange of info via multiple back-and-forth transmissions between two nodes

DATA UNIT Data

Translation of data between a networking service and an application (e.g., ASCII encoding)

DATA UNIT DataEXAMPLE(S) HTTP, FTP, Telnet

High-level APIs, with resource sharing, file access, directory services and virtual terminals