Which of the following OSI layers does not provide confidentiality?

A.
Presentation

B.
Network

C.
Transport

D.
Session

Explanation:
1.
Reference: “[Network Layer] The routing protocols are located at this layer and include the
following: …..Internet Protocol Security (IPSec)”. “The following protocols operate within the
Session layer: Secure Sockets Layer (SSL)”. “The Presentation layer is also responsible for
encryption and compression.” Pg 61-62 Tittel: CISSP Study Guide
2.
According to this chart:
http://en.wikipedia.org/wiki/OSI_model
Network – IPSEC
Presentation – SSL/TLS
Session – L2TP
Transport – remains an answer.
3. According to Shon Harris / CISSP 5th edition, SSL is at the TRANSPORT layer
Conclusion:
So, 3 different sources put SSL at 3 completely different layers. But using 1 of the 2 sources does
get you with ‘transport’ as being the answer.