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CISSP Training Kit by David R. Miller

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Chapter summary

Table 7-10 shows a review of the details of the Open Systems Interconnection (OSI) Model by the International Standards Organization (ISO), alongside the TCP/IP model.

Table 7-10. A quick review of the OSI Model and the TCP/IP model

Layer

OSI model

Form

Function

Devices

TCP/IP model

7

Application

Data stream

Network access for applications

Gateway function

Application

6

Presentation

Data stream

Data conversion into standard format, encryption, compression

 

5

Session

Data stream

Inter-host communications, session maintenance

 

4

Transport

Segment

End-to-end connection, TCP or UDP; ports

 

Transport

3

Network

Packet or datagram

IP addressing (logical), routing

Router, packet filter firewall

Internet

2

Data Link

Frame

MAC address, CRC, media access

Bridge, switch, wireless ...

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