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The OSI Model

posted 15 Sept 2016, 00:34 by Donald Ross   [ updated 15 Sept 2016, 03:48 ]

7 - Application - Message format, Human-Machine Interface
7.  Application Layer - DHCP, DNS, FTP, HTTP, IMAP4, NNTP, POP3, SMTP, SNMP, SSH, TELNET and NTP
This layer supports application and end-user processes. Communication partners are identified, quality of
service is identified, user authentication and privacy are considered, and any constraints on data syntax
are identified. Everything at this layer is application-specific. This layer provides application services for file
transfers, e-mail, and other network software services., HTTP, IMAP4, NNTP, POP3, SMTP, SNMP, SSH, TELNET and NTP

6 - Presentation - Coding into 1s&0s, encryption, compression
6.  Presentation layer – SSL, WEP, WPA, Kerberos,

5 - Session - Authentication, permissions, session restoration
5.  Session layer - Logical Ports 21, 22, 23, 80 etc.

4 - Transport - end to end error control
4.  Transport - TCP, SPX and UDP

3 - Network - Network addressing; Routing/Switching
3.  Network - IPv4, IPV6, IPX, OSPF, ICMP, IGMP and ARP

2 - Data Link - Error detection, flow control on physical layer
2.  Data Link - 802.11 (WLAN), Wi-Fi, WiMAX, ATM, Ethernet, Token Ring, Frame Relay, PPTP, L2TP and ISDN

1 - Physical - Bit stream: physical medium, method of representing bits
1.  Physical - Hubs, Repeaters, Cables, Optical Fiber, SONET/SDN,Coaxial Cable, Twisted Pair Cable and
Connectors
 
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