Embed Size (px)
DESCRIPTION
Internet Connections and the OSI Model. The ISO/OSI Model. The International Standards Organization / Open Systems Interface Model. End of Presentation. - PowerPoint PPT Presentation
Citation preview
Internet Connections and the OSI Model
5 U
4 U
5 U
5 U
5 U
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP Stack
Data Link Layer
Physical Layer
Network Layer
Program that you run
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Socket
Firmware in Switch
Ethernet Socket
Ethernet Cable
Data Link LayerFirmware on Network Card
Routing Program
Ethernet Cable
Your Computer
Ethernet Switch
Local Router
Network Layer Routing Program
Fiber Optic Cable
Internet Service Provider Router
Physical Layer
Ethernet Socket
Physical Layer
Ethernet Socket
Physical Layer
Fiber Optic Socket
Fiber Optic Cable, Twisted Pair Wire, or Coax Cable
Physical Layer
Fiber Optic Socket
Physical Layer
Appropriate Socket
Network Layer Routing Program
Internet Core Router
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Appropriate Card
Physical Layer
Appropriate Socket
Physical Layer
Fiber Optic Socket
Data Link LayerFirmware on
Appropriate Card
Data Link LayerFirmware on
Fiber Optic Card
Data Link Layer
Physical Layer
Firmware in Switch
Fiber Optic Cable
Fiber Optic Cable
Telephone Switch
Physical LayerMicrowave Transciever
Microwaves through the air
Data Link Layer
Physical Layer
Firmware in Switch
Microwave Transciever
Telephone Switch
Physical Layer
Fiber Optic Socket
Physical Layer
Fiber Optic Cable
Fiber Optic Cable
Data Link Layer
Firmware in Switch
Telephone Switch
Physical Layer
Fiber Optic Socket
5 U
5 U
5 U
5 U
Fiber Optic Cable
Network Layer Routing Program
Physical Layer
Fiber Optic Socket
Physical Layer
Fiber Optic Socket
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Fiber Optic Card
4 U
Network Layer Routing Program
Fiber Optic Wire
Internet Service Provider Router
Physical Layer
Fiber Optic Socket
Physical Layer
Ethernet Socket
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Ethernet Card
Internet Core Router
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Web Server Program
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Cable
Web Server
Data Link Layer
Physical Layer
Firmware in Switch
Ethernet Socket
Ethernet Wire
Ethernet Switch
Physical Layer
Ethernet Socket
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP Stack
Web Server Program
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Socket
Database Server
Data Link Layer
Physical Layer
Firmware in Switch
Ethernet Socket
Ethernet Cable
Ethernet Switch
Physical Layer
Ethernet Socket
Physical Layer
Ethernet Socket
Ethernet Cable
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
5 U
4 U
5 U
5 U
5 U
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP Stack
Data Link Layer
Physical Layer
Network Layer
Program that you run
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Socket
Firmware in Switch
Ethernet Socket
Ethernet Cable
Data Link LayerFirmware in
Ethernet Chip
Routing Program
Ethernet Cable
Your Computer
Cable Modem
Home Router
(Includes Wi-Fi and Switch)
Network Layer Routing Program
Fiber Optic Cable
Internet Service Provider Router
Physical Layer
Ethernet Socket
Physical Layer
Ethernet Socket
Physical Layer
Fiber Optic Socket
Fiber Optic Cable, Twisted Pair Wire, or Coax Cable
Physical Layer
Fiber Optic Socket
Physical Layer
Appropriate Socket
Network Layer Routing Program
Internet Core Router
Data Link LayerFirmware in
Ethernet Chip
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Appropriate Card
Physical Layer
Appropriate Socket
Physical Layer
Fiber Optic Socket
Data Link LayerFirmware on
Appropriate Card
Data Link LayerFirmware on
Fiber Optic Card
Data Link Layer
Physical Layer
Firmware in Switch
Fiber Optic Cable
Fiber Optic Cable
Telephone Switch
Physical LayerMicrowave Transciever
Microwaves through the air
Data Link Layer
Physical Layer
Firmware in Switch
Microwave Transciever
Telephone Switch
Physical Layer
Fiber Optic Socket
Physical Layer
Fiber Optic Cable
Fiber Optic Cable
Data Link Layer
Firmware in Switch
Telephone Switch
Physical Layer
Fiber Optic Socket
5 U
5 U
5 U
5 U
Fiber Optic Cable
Network Layer Routing Program
Physical Layer
Fiber Optic Socket
Physical Layer
Fiber Optic Socket
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Fiber Optic Card
4 U
Network Layer Routing Program
Fiber Optic Wire
Internet Service Provider Router
Physical Layer
Fiber Optic Socket
Physical Layer
Ethernet Socket
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Ethernet Card
Internet Core Router
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Web Server Program
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Cable
Web Server
Data Link Layer
Physical Layer
Firmware in Switch
Ethernet Socket
Ethernet Wire
Ethernet Switch
Physical Layer
Ethernet Socket
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP Stack
Web Server Program
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Socket
Database Server
Data Link Layer
Physical Layer
Firmware in Switch
Ethernet Socket
Ethernet Cable
Ethernet Switch
Physical Layer
Ethernet Socket
Physical Layer
Ethernet Socket
Ethernet Cable
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP Stack
App that you run
Operating System
Operating System
Operating System
Operating System
Firmware on Wi-Fi Chip
Antenna
Wi-Fi Signal
Laptop Computer
Physical Layer
Antenna
Data Link LayerFirmware in Wi-Fi Chip
NetworkAddress
Tranlation
5 U
4 U
5 U
5 U
5 U
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP Stack
Data Link Layer
Physical Layer
Network Layer
App that you run
Operating System
Operating System
Operating System
Operating System
Firmware on Wireless Chip
Antenna
Firmware in Access Point
Antenna
Wi-Fi Signal through the air
Data Link LayerFirmware on
Network Card
Routing Program
Ethernet Wire
Tablet or WiFi Computer
Wireless Access Point Switch
Local Router
Network Layer Routing Program
Fiber Optic Wire
Internet Service Provider Router
Physical Layer
Ethernet Socket
Physical Layer
Ethernet Socket
Physical Layer
Fiber Optic Socket
Fiber Optic Cable, Twisted Pair Wire, or Coax CablePhysical Layer
Fiber Optic Socket
Physical Layer
Appropriate Socket
Network Layer Routing Program
Internet Core Router
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Appropriate Card
Physical Layer
Appropriate Socket
Physical Layer
Fiber Optic Socket
Data Link LayerFirmware on
Appropriate Card
Data Link LayerFirmware on
Fiber Optic Card
Data Link Layer
Physical Layer
Firmware in Switch
Fiber Optic Cable
Fiber Optic Cable
Telephone Switch
Physical LayerMicrowave Transciever
Microwaves through the air
Data Link Layer
Physical Layer
Firmware in Switch
Microwave Transciever
Telephone Switch
Physical Layer
Fiber Optic Socket
Physical Layer
Fiber Optic Cable
Fiber Optic Cable
Data Link Layer
Firmware in Switch
Telephone Switch
Physical Layer
Fiber Optic Socket
5 U
5 U
5 U
5 U
Fiber Optic Cable
Network Layer Routing Program
Physical Layer
Fiber Optic Socket
Physical Layer
Fiber Optic Socket
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Fiber Optic Card
4 U
Network Layer Routing Program
Fiber Optic Wire
Internet Service Provider Router
Physical Layer
Fiber Optic Socket
Physical Layer
Ethernet Socket
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Ethernet Card
Internet Core Router
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Web Server Program
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Cable
Web Server
Data Link Layer
Physical Layer
Firmware in Switch
Ethernet Socket
Ethernet Wire
Ethernet Switch
Physical Layer
Ethernet Socket
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP Stack
Web Server Program
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Socket
Database Server
Data Link Layer
Physical Layer
Firmware in Switch
Ethernet Socket
Ethernet Cable
Ethernet Switch
Physical Layer
Ethernet Socket
Physical Layer
Ethernet Socket
Ethernet Cable
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
5 U
5 U
5 U
5 U
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
Signaling System 7Data Link Layer
Physical Layer
App that you run
Operating System
Operating System
Operating System
Operating System
Firmware on Telephone Card
Antenna
Firmware in Telephone Circuitry
Antenna
Cell Phone Signal
Smart Phone
Cell Tower
Physical Layer
Fiber Optic Socket
Fiber Optic Cable, Twisted Pair Wire, or Coax Cable
Network Layer Routing Program
Internet Core Router
Physical Layer
Appropriate Socket
Physical Layer
Fiber Optic Socket
Data Link LayerFirmware on
Appropriate Card
Data Link LayerFirmware on
Fiber Optic Card
Data Link Layer
Physical Layer
Firmware in Switch
Fiber Optic Cable
Fiber Optic Cable
Telephone Switch
Physical LayerMicrowave Transciever
Microwaves through the air
Data Link Layer
Physical Layer
Firmware in Switch
Microwave Transciever
Telephone Switch
Physical Layer
Fiber Optic Socket
Physical Layer
Fiber Optic Cable
Fiber Optic Cable
Data Link Layer
Firmware in Switch
Telephone Switch
Physical Layer
Fiber Optic Socket
5 U
5 U
5 U
5 U
Fiber Optic Cable
Network Layer Routing Program
Physical Layer
Fiber Optic Socket
Physical Layer
Fiber Optic Socket
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Fiber Optic Card
4 U
Network Layer Routing Program
Fiber Optic Wire
Internet Service Provider Router
Physical Layer
Fiber Optic Socket
Physical Layer
Ethernet Socket
Data Link LayerFirmware on
Fiber Optic Card
Data Link LayerFirmware on
Ethernet Card
Internet Core Router
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Web Server Program
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Cable
Web Server
Data Link Layer
Physical Layer
Firmware in Switch
Ethernet Socket
Ethernet Cable
Ethernet Switch
Physical Layer
Ethernet Socket
Physical Layer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP Stack
Web Server Program
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Ethernet Socket
Database Server
Data Link Layer
Physical Layer
Firmware in Switch
Ethernet Socket
Ethernet Cable
Ethernet Switch
Physical Layer
Ethernet Socket
Physical Layer
Ethernet Socket
Ethernet Cable
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Data Link Layer
Physical Layer
Firmware in Switch
Fiber Optic Socket
Fiber Optic Cable
Central Office Telephone
Switch
Physical LayerMicrowave Transciever
Microwaves through the air
Data Link Layer
Physical Layer
Firmware in Switch
Microwave Transciever
Telephone Switch
Physical Layer
Appropriate Socket
Physical Layer
Network Layer
Data Link LayerSignaling System 7
Data Link Layer
Physical Layer
Firmware in Telephone
Firmware in Telephone
Antenna
Firmware in Telephone Circuitry
Antenna
Cell Phone Signal
Voice Cell Phone
Cell Tower
Physical Layer
Fiber Optic Socket
Fiber Optic Cable
Data Link Layer
Physical Layer
Firmware in Switch
Fiber Optic Cable
Telephone Switch
Physical LayerMicrowave Transciever
Microwaves through the air
Data Link Layer
Physical Layer
Firmware in Switch
Microwave Transciever
Physical LayerTwisted Pair Connector
Twisted Pair Physical Layer
Signaling System 7
Twisted Pair Socket
Data Link Layer
Physical Layer
Firmware in Switch
Fiber Optic Socket
Fiber Optic Cable
Central Office Telephone
Switch
Physical LayerMicrowave Transciever
Microwaves through the air
Data Link Layer
Physical Layer
Firmware in Switch
Microwave Transciever
Telephone Switch
Physical Layer
Fiber Optic Socket
Network Layer Firmware in Switch
Central Office Telephone
Switch
Network Layer Firmware in Switch
Signaling System 7
Land Line Phone
The ISO/OSI Model
The International Standards Organization / Open Systems Interface Model
Your Computer
Application LayerBrowser
Web Server
Application LayerWeb Server Program
Get(page, 32)
<---
----
- Act
ual D
ata
Flow
Desired data flow -------->
Your Computer
Presentation Layer
Application LayerBrowser
Operating System
Web Server
Presentation LayerOperating System
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
<---
----
- Act
ual D
ata
Flow
Desired Data Flow -------->
Your Computer
Session Layer
Presentation Layer
Application LayerBrowser
Operating System
Operating System
Web Server
Session Layer
Presentation LayerOperating System
Operating System
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
>>> No one’s been able to figure out exactly what the Session Layer does anyway <<<
<---
----
- Act
ual D
ata
Flow
Your Computer
Transport Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Web Server
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
b+gx^&rV1Aq
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
<---
----
- Act
ual D
ata
Flow
Desired Data Flow -------->
Your Computer
Network Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Web Server
Network Layer
Transport Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
b+gx^&rV1Aq
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
Desired Data Flow -------->
<---
----
- Act
ual D
ata
Flow
Your Computer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Web Server
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
b+gx^&rV1Aq
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
MAC To: 45-3A-21-F6-72-9A MAC From: 77.BD.2F.33.02.4C -- IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
<---
----
- Act
ual D
ata
Flow
Desired Data Flow -------->
Your Computer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Web Server
Physical Layer
Ethernet Socket
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
b+gx^&rV1Aq
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
MAC To: 45-3A-21-F6-72-9A MAC From: 77.BD.2F.33.02.4C -- IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
0001010001110010101110101110010101001010101010100000101001110010101000101101011010011010100111010100010101010001010100010010001010010
<---
----
- Act
ual D
ata
Flow
Data flows across only at the Physical Layer -------->
Your Computer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Web Server
Physical Layer
Ethernet Socket
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
b+gx^&rV1Aq
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
MAC To: 45-3A-21-F6-72-9A MAC From: 77.BD.2F.33.02.4C -- IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
0001010001110010101110101110010101001010101010100000101001110010101000101101011010011010100111010100010101010001010100010010001010010
<---
----
- Act
ual D
ata
Flow
Data Transfer at Data Link Layer, apparently direct -------->
<-------- Actual Data Flow
Data flows across only at the Physical Layer -------->
Your Computer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Web Server
Physical Layer
Ethernet Socket
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
b+gx^&rV1Aq
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
MAC To: 45-3A-21-F6-72-9A MAC From: 77.BD.2F.33.02.4C -- IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
0001010001110010101110101110010101001010101010100000101001110010101000101101011010011010100111010100010101010001010100010010001010010
<---
----
- Act
ual D
ata
Flow
Data Transfer at Data Link Layer, apparently direct -------->
<-------- Actual Data Flow
Data flows across only at the Physical Layer -------->
Data Transfer at Network Layer, apparently direct -------->
Your Computer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Web Server
Physical Layer
Ethernet Socket
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
b+gx^&rV1Aq
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
MAC To: 45-3A-21-F6-72-9A MAC From: 77.BD.2F.33.02.4C -- IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
0001010001110010101110101110010101001010101010100000101001110010101000101101011010011010100111010100010101010001010100010010001010010
<---
----
- Act
ual D
ata
Flow
Data Transfer at Data Link Layer, apparently direct -------->
<-------- Actual Data Flow
Data flows across only at the Physical Layer -------->
Data Transfer at Network Layer, apparently direct -------->
Data Transfer at Transport Layer, apparently direct -------->
Your Computer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Web Server
Physical Layer
Ethernet Socket
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
>>> No one’s been able to figure out exactly what the Session Layer does anyway <<<
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
MAC To: 45-3A-21-F6-72-9A MAC From: 77.BD.2F.33.02.4C -- IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
0001010001110010101110101110010101001010101010100000101001110010101000101101011010011010100111010100010101010001010100010010001010010
<---
----
- Act
ual D
ata
Flow
Data Transfer at Data Link Layer, apparently direct -------->
<-------- Actual Data Flow
Data flows across only at the Physical Layer -------->
Data Transfer at Network Layer, apparently direct -------->
Data Transfer at Transport Layer, apparently direct -------->
Your Computer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Web Server
Physical Layer
Ethernet Socket
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
>>> No one’s been able to figure out exactly what the Session Layer does anyway <<<
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
MAC To: 45-3A-21-F6-72-9A MAC From: 77.BD.2F.33.02.4C -- IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
0001010001110010101110101110010101001010101010100000101001110010101000101101011010011010100111010100010101010001010100010010001010010
<---
----
- Act
ual D
ata
Flow
Data Transfer at Data Link Layer, apparently direct -------->
<-------- Actual Data Flow
Data flows across only at the Physical Layer -------->
Data Transfer at Network Layer, apparently direct -------->
Data Transfer at Transport Layer, apparently direct -------->
Data Transfer at Presentation Layer, apparently direct -------->
Your Computer
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
Application Layer
TCP / IP
Browser
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Web Server
Physical Layer
Ethernet Socket
Network Layer
Transport Layer
Data Link Layer
Session Layer
Presentation Layer
TCP / IP
Operating System
Operating System
Operating System
Operating System
Firmware on Network Card
Physical Layer
Ethernet Socket
Application LayerWeb Server Program
Get(page, 32)
b+gx^&rV1Aq
>>> No one’s been able to figure out exactly what the Session Layer does anyway <<<
TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
MAC To: 45-3A-21-F6-72-9A MAC From: 77.BD.2F.33.02.4C -- IP To: 192.168.11.61 IP From: 10.247.89.172 -- TCP Packet 776 to Port 3218 -- b+gx^&rV1Aq
0001010001110010101110101110010101001010101010100000101001110010101000101101011010011010100111010100010101010001010100010010001010010
<---
----
- Act
ual D
ata
Flow
Data Transfer at Data Link Layer, apparently direct -------->
<-------- Actual Data Flow
Data flows across only at the Physical Layer -------->
Data Transfer at Network Layer, apparently direct -------->
Data Transfer at Transport Layer, apparently direct -------->
Data Transfer at Presentation Layer, apparently direct -------->
Data Transfer Between Applications, apparently direct -------->
End of Presentation
