Foundation : What is a Network ?
Foundation : What is a Network ?
apa itu network ??
– fungsi internetwork
– Chunks ( PDU ) yang membuat internetwork
– applikasi yang digunakan untuk network
– design simple network
– osi vs tcp/ip
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apa itu internet network
1. adalah sebuah platform untuk transfer sebuah data dari titik point A ke point B > Communication
2. digunakan untuk business to deliver information ex, Bank, SP Trading etc.
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Network Component :
Medium = Perangkat
Router
Switch
Cable = UTP, STP, Fiber, Coaxial
PC
Server
NIC
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Aplikasi yang menggunakan Network
Web Browser = HTTP
Database Applikasi
Instant Messenger
E-mail
Online Games : CS online PB
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Consideration for Network Aplikasi:
Speed
Delay = traffic-nya banyak
Avaibility= suatu network dimana component ada yang fail tetapi servicenya masih jalan
1. Redunancy
Link (backup)
scalability = adalah ukuran network untuk berkembang dan menjadi besar tanpa harus konfigurasi yang intens
( maksudnya contoh sudah ada switch poe – 2 thaun kedpn kita punya voip artinya tidak perlu ganti sw baru).
CSMA/CD = carrir send multipleport access / collusion detection = adalah policy aturan untuk pc saat mengirim data pada saat tertentu
hanya boleh saat tertentu.
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OSI vs TCP
* pada jaman dolo network tidak ada standart – dolo pake priopetery
dolo pake namanya EDI = electronic data interchange, adalah dolo kalau mau tukar informasi harus 1 brand
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Application L7 = GUI
Presentation L6= Format Data
Session L5 = kalau login saya sebagian Admin, kamu di login sebagai guest itu kita berada di session berapa
Transport L4 = Multiplexing
Network L3 = logical addressing atau IP -address
Data-Link L2 = Physical addressing – mac address
Physical L1 = Biner > 101110 dari gelobang digital menjadi 1012, suatu layer yang bertanggu jawab terhadap mengubahan data
menjadi biner
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L4 OSI – Transport Layer =
* Multiplexing
* Using Ports
* Established End to End Connectivity
Reliable -> TCP = contoh Download ( 3 way handshake )
Unrealiable -> UDP = Real time, Video steaming, Youtube, cisco webex
*L4 PDU = Segment
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L3 OSI – Network Layer =
* Logical addressing
* Provide connectivity and pilihan jalur > ROuting
L3 PDU > Packet
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L2 OSI – Data Lin
* Physical Addressing
* Typically Has error detection > CRC
* L2 PDU -> Frame (chunk )
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L1 OSI – Physical
* Bertanggung jawab untuk meng-translate any medium (perangkat) signal menjadi binary
* Related to cabling
Coax, Twisted pair, UTP STP
Fiber
*L1 PDU > bits
OSI Layer
Understand the layers of OSI:
Application L7 : (GUI) Browser IE, Firefox, Google chrome
CS Online, Warcraft Online games
how to application communicate because well known API = aplication program Interface
Presentation L6 : I have data to send data to send network
Data akan di format into language that webserver understand
(IIS, Apache, Webs)
IE > IIS
Presentation that understand that language
Generate formate mengerti format, jpeg, html, java
Generate encryption
Session L5 : Diffrenrence senssion ( Admin and Guest )
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Transport Layer L4 : TCP <-> Reliable / Acknowlegdement ( I got it ) so i know that packet got there!
UDP <-> UnReliable / Real Time = VOIP, TV, Youtube, Live Streaming
Application Seperation = PORTS
Network Layer L3 : Logical Address = IP Address
Data-Link Layer L2 : Physical Layer > MAC Address, LLC
Phycical L1 : kable, utp, stp, fiber, coax ( bits ) 1/0 1/0
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L4
Send duit $50
all header = $50 [DATA] application > TCP > Destination Port 443 [Encapsulation] > well know [S-ip address] > S ip add 172.xx > D-IP add .8 >S -mac > D -mac
L4 Transport : Port : 80 ketika duit dikirim transport layer contoh BOA.com:80
L3 Network : IP address Source to destination Path
L2 Datalin : Source Mac to Destination Mac
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tracert -d http://www.bankofarizona.com
netstats untuk melihat semua opening connection dari komputer saya
Router punya default Route for internet (BGP) how to reach some server on internet!
ape on the roof 