Computer Networks 101:
 Internet Protocol Stack

Computer Networks 101:


Internet Protocol Stack

Michael Tsai

2018/02/26

Internet: 5-Layer Architecture

•

•

( )

( )

• Link Layer + Physical Layer 100 Mbps Fast Ethernet

866.7 Mbps 802.11ac

•

( )

layer

• : Retransmission transport layer link layer

Physical Layer Link Layer Network Layer Transport Layer Application Layer

Pro to co l St a ck

Internet: Application & Transport Layers

Physical Layer Link Layer Network Layer Transport Layer Application Layer

Pro to co l St a ck

: http ( ) client

server request server client

application layer end-to-end

TCP connection

application

” ”(

)

( )

Internet: Network, Link, & Physical Layers

Physical Layer Link Layer Network Layer Transport Layer Application Layer

Pro to co l St a ck

Network layer packet

transport layer (IP Address) network layer

( ) ( / )

packet

Link layer packet

( )

!

Physical layer packet bit

bit

Physical Link Network Transport Application Send a photo via Line


to the server


(then to a friend)

Ht Ht Hn

Ht Hn

Hl

Physical Link Network 10 Gb/s

Physical Link Network 1 Gb/s

Ht Hn

Hn Ht Hl

Physical

Link Hl Hn Ht

Physical Link Network Transport Application Ht

Ht Hn

Ht Hn

Hl

Your Smartphone

Ht Hn

Hn Ht Hl

WiFi 


Access Point

Router Router

802.11n
 150 Mbps

1 Gb/s


Cat 5e UTP

…….