OSI Layer Question

[Kuldeep singh]

Which layers of the osi model are host to host layers ?

1. Transport, session,Presentation, Application

2. Network, Transport, Session, Presentation

3. Datalink, Network, Transport, Session

4. Physical, Datalink,Network, Transport

Which is the correct option ?

[daniel.dib · Accepted solution]

Option 1 should be the correct one. They are the highest layers in the OSI stack. See Wikipedia for more information on OSI model:

http://en.wikipedia.org/wiki/OSI_model

Daniel Dib
CCIE #37149

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[Kuldeep singh]

Hi Daniel,

I feel that option may be 4

[daniel.dib]

Trying to find a reference for it but seems difficult. Where did you find the question?

Daniel Dib
CCIE #37149

Please rate helpful posts.

[Kuldeep singh]

plz help me out

[Jon Marshall]

Kuldeep

The host layers are generally considered to be the transport layer and above. The layers below the transport layer are considered to be the media layers ie. concerned with encapsulating the data with the correct headers and placing the resulting frame onto the physical media.

I'm not sure why you think the correct answer is 4 ?  I would agree with what Daniel has said.

See this link for more details -

http://support.sixnet.com/wiki/images/1/1f/Sixnet_Training_-_OSI_Model.pdf

Jon

[Mohammed Aswath Ali]

i go ahead with jon.marshall . The answer is Transport, session,Presentation, Application are considered to be host layers