Protocol Data Unit (PDU) didefinisikan sebagai “a single unit of information transmitted among peer entities of a computer network.”. Secara diagram, dapat digambarkan, sebagai berikut:
Transmit’ , F. Receive - . oe ai
{ Application i Application .
PA Pa: ;
, 0 Bagi ian 2 _.., Anam al re ee oo dimana jika diilustrasikan dalam contoh proses transmisi data pengiriman dan penerimaan email, dapat digambarkan, sebagai berikut (beserta dengan contoh perangkat/unit (hardware devices) dan tipe protocol yang digunakan pada setiap layer):
ADP Machine Layer 7 - Application ” Layer 6- Presentation Layer 5 - Session Layer 4 - Transport Layer 3 - Network Layer 2 - Data Link Layer 1 - Physical
Keep track of how many
: tf Isth 1
Emas sent from Identity sender and Encode data with X Initiate and terminate the hops: is the initial connection | cg as electrical signal
John intended receiver. is there Make sure all data is sent set up? Put data into coding key: use ASCI] session according to X Jopen shortest path First over the network cable at
Meet meal Car's an email application intact frames according to X
Haa Naa Bea characters. protocol Soto IP address Nanga X voltage. and X Mbps.
i 25565 0.123
Routers. Layer 3 {or IP
Outors. Layer 3 oriP) sedges and switches, | Hubs, repeaters, network
Devices Gateway Firewall switches! multilayer ethernet’, access point | adapter (NIC), cable switches
SNMP. SMTP. FTP Firewall, NetBEUT, TCP, 11P. PIX, NWfink, NerBEUI
Protocols NTTP. ete NCP. AFP. TDI NetBlos SPX, Nk, UDP. cmp Ethernet, WiFi, PPP.etc| CAT 5. Ru-45, ete
ADP Machine Layer7- Application | Layer 6 - Presentation Layer 5 - Session Layer 4 - Transport. Layer 3 - Network Layer 2 - Data Link Layer 1 - Physical
Keep track of haw many
Emar ‘eceivec fom | hops. The initial connection set
Identified sender and — (Decoded data with X _|initiated and terminated Receive electrical signal
John Make sureall datahas opened the shortest path up. Decoded data in intended receiver. found e|decoding key: used ASCII |the session according to over the network cable at
Meet meat Car's MENOee Teen charactors x protocal arrived intact First frame according to Xe aa slope
4:30 (Joni Pel p Went to IP address standard. 9 Wp
25565 0.123
Routers, Layer 3 (or IP outers. Layer 3 torIP) edges and switches, | Hubs, repeaters, network
Devices Gateway Firewall switches! multilayer
. ethernet'.access point | adapter (NIC). cable switches
SNMP, SMTP, FTP, Firewall. NetBEUI, TCP. | IP. PIX. NWitnk, NetBEUI
Protocols “HTTP. ee | NCP, AFP. TDI NetBIOS SPX Nwine UDP | ome Ethernet, Wi-Fi, PPP,etc| CAT 5. RU-45. etc
Dengan menggunakan referensi di atas, proses transmisi data yang berlangsung dapat diuraikan secara singkat, sebagai berikut:
a. Sebagaimana yang telah diuraikan sebelumnya, hal utama dan terutama yang harus dipahami dan disepakati adalah bahwa OSI Model merupakan referensi yang berisi cara kerja transmisi data / internet protocol dalam sebuah jaringan komputer.
Jaringan komputer atau computer network dapat didefinisikan sebagai sebuah jaringan yang terdiri dari “two or more computers that are connected – either by cables (wired) or WiFi (wireless) – with the