.::cont OSI Layer::.

bismillahirrahmanirrahim...
ni cont ape yg aq dok post b4 ni..

data link layer:

• to deliver data units from one station to the next station without error(node-to-node)
• data packets are encoded & decoded into bits.
• adds header &trailer to the data being sent.

network layer:

• responsible for the source to destination delivery of packets across multiple network link.
• the data link layer oversees station to station (node-to-node) delivery.
• ensures that each packets gets from its point of origin to its destination successfully & efficiently.

transport layer:

• responsible for the source to destination (end-to-end) delivery of the entire massage.
• end-to-end packets delivery.
• segmentation & reassembling (flow chart)
• transparent transfer the data between end system.

session layer:

• it is network dialog controller, it establishes,maintains & synchronizes the link between communicating devices.
• ensures the each session close appropriately rather than shutting down abruptly & leaving for user hanging.

presentation layer:

• ensures interoperability among communicating devices.also responsible for code conversion.
• also responsible for the encryption &decryption of data security purpose.
• also responsible handles the expansion & compression of data when necessary for transmission efficiency.
• ASN1(Abstract Syntax Notation One)

application layer:

• enables the user,whether human or software to access the network.
• provides user interface & support the services such as electronic mail, remote fail access & transfer.
• CMIP(Common Management Information Protocol)
• CMIS(Common Management Information Service)

ade lg yg aq dok lom bce..
mate lak segar xngntok..
tp pale hotak ni da melayang2 se nye..
ahai......
cont later.......