22 April 2010

jam da tunjuk kol 5.11 mint pg..
da nk subh..
ngan xtdo lgsg..
then hujan turun lebat..
siap ade kilat lg...
aq dok sndrian kt ruang tamu ditemani tv n lptop..
serta notes2 aq..
hhaahha..aq da mule jd sengal..
mau nye xsengal..
pale da rse huyung hayang..
tp mate xngantok..
hope ape yg aq study kn ley msok la kt dlm pale n ley jwb la exam pg t..
tggal 5jam jek lg ntok aq mlangkah ke dewan exam..
chaiyok2 ecah..
aja-aja ecah..
chaiyok2 mmbe ku skalian...
aja-aja fighting ya sume...

.::cont OSI Layer::.

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..
cont later.......

.::OSI Layer::.

OSI Layer:
  • OSI(Open System Interconnection)
  • have 7 layers in OSI.
  • layer should be created where are different level of abstraction is needed.
  • each of layer should be perform as well define function.
  • the function of each layer should be chosen with an eye towards defining internationally standardized protocol.
  • the layer boundaries should be chosen to minimizes the information flow across the interface.
  • the no. of each layer should be large enough that distinct function needs not be thrown together in the same layer out of necessity, & small enough that the architecture does not become unwieldy.
functions of physical layer:
  • coordinate the function required to transmit bit of stream over a physical medium.
  • it deals with mechanical & electrical specifications of a primary connection such as cables&connectors.
  • line configuration: topology, bit synchronization & data transmission mode.
ni bkn la aq nk merepek..
tp ape yg aq taip kt ats ni note brkenaan exam sok..
ni bru suku notes yg aq dok study..
puas bce byk kli tp xmsok2 dlm pale..
ayt sume ulang2..pening2...
prmudahkn la hambaMU ini memorize the notes....
ok..will be cont later.....

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