Talk:List of network protocols (OSI model)

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This article was started with content from Communications protocol.

So why are NFS and SMB listed as session-layer protocols, rather than application-layer protocols? Guy Harris 06:32, 29 December 2005 (UTC)

Isn't HTTP a Session Layer protocol?

  • It sits on top of a Transport Protocol
  • It carries payload defined by a Content-Type (Presentation)
  • By itself HTTP is useless you use it to "Read a Newspaper" (Application) in formated HTML (Presentation) The preceding unsigned comment was added by LuisOntanon (talk • contribs) 20:10, 13 February 2006 (UTC).
It also fetches data and transports requestions (POST); if everything that ran atop a transport protocol were a session layer protocol, most if not all of the common protocols running atop TCP/IP would be classified as session-layer protocols.
The problem is that the OSI model doesn't always match the way things are done; a protocol might include some functions considered part of the session layer, but most of what it does is at a higher layer.
Also, when reading a newpaper online, there's no "application-layer protocol" involved - the application uses HTTP as the protocol for fetching content, there's no application-layer protocol above HTTP. When using XML-RPC, there is a higher-level protocol using HTTP for lower-level functions. Whether HTML (or PDF, or GIF, or JPEG, or...) is a presentation layer protocol, or just the format the raw data being transported by HTTP happens to be in, is a matter of interpretation; about the only thing I see as different between HTTP and, say, FTP or NFS is that HTTP allows the client to specify the formats they're willing to receive and allows the server to specify the format it's sending. Guy Harris 03:48, 14 February 2006 (UTC)

The Layer 6 Presentation Layer protocols seems to be missing.Hawg-farmer 19:35, 15 February 2006 (UTC)

I believe BGP is technically a layer 7 protocol used to control layer 3. Its an application that uses tcp over ip connections to communicate the availabity of layer 3 routes between routers.


There are many layers not in the OSI model. The most used protocol stack on earth does not conform to the OSI stack. LTE and its many layers can actually carry the entire OSI stack on top of it. We should try not to me so "Internet Protocol-Centric" The failed and obsolete "OSI" model could have its own page so this page could cover network protocols? imho Scottprovost (talk) 18:17, 15 June 2016 (UTC)

..i don't know what you think about MP3, JPEG, MPEG .. but they are definetely nothing which has anything to do with the OSI-Layer-model. (talk) 11:31, 15 July 2015 (UTC)



Where does this fit in? Humourous or not, it is a data transfer protocol that has been implemented.(once)--Marhawkman (talk) 22:57, 15 December 2007 (UTC)

Well, it includes both the physical layer (birds and printed messages), so it could be added to Category:Physical layer protocols, and the data link layer (with a trivial encapsulation, as there's no protocol type field - sorry, no IPX-over-carrier-pigeon), so it could also be added to Category:Link protocols. Those categories are what the "more" links in the bottom two layers of the IP stack link to in the IP stack template. Guy Harris (talk) 23:26, 15 December 2007 (UTC)
thanks. It's added now.--Marhawkman (talk) 12:50, 16 December 2007 (UTC)

TCP/ IP[edit]

TCP/IP were the original Internet Protocols, independent of the rest of OSI. How come they are not mentioned as a set in their own right, but only as minor parts of something set of protocols? Corrupt one (talk) 23:53, 9 June 2008 (UTC)


This page says MIME is part of Layer 7. But on MIME is listed as being part of Layer 6. It seems to be part of Layer 6 to me. WikiMix (talk) 14:58, 18 January 2009 (UTC)


Is XML itself its own layer, because Markup Languages (though Layer 7) but they can be use for traffic control. -- (talk) 19:15, 17 April 2009 (UTC)

XML is not a protocol Teo8976 (talk) 17:31, 8 February 2015 (UTC)


Could someone please add SAP (Session Announcement Protocol) in the relevant layer. Thanks. —Preceding unsigned comment added by (talk) 15:30, 13 October 2009 (UTC)

About Server Protocols[edit]

We know there are large number of protocols are used in Information Technology, but i like to know what were the important/required protocols are required when we used to handle Server. Please send your feedback and required related studies for effective server management to the my emails address

SIP, STUN 7->5[edit]

Aren't SIP and STUN Layer 5-Protocolls? --Fabiwanne (talk) 14:54, 27 June 2014 (UTC)

Why is SIP listed under Layer 7 and Layer 5? — Preceding unsigned comment added by (talk) 03:31, 25 April 2017 (UTC)

ICMP -> Layer 4; BGP -> layer 5[edit]

ICMP is using IP

BGP is using TCP