The Secure Shell (SSH) version 2 protocol is a network protocol that provides a secure and encrypted communication channel between two hosts over an unsecured network. The SSH version 2 protocol supports four main security features: authentication, compression, confidentiality, and integrity. Authentication is the process of verifying the identity and credential of the hosts or users involved in the communication.
Compression is the process of reducing the size of the data transmitted over the network to improve the performance and efficiency of the communication. Confidentiality is the process of encrypting the data to prevent unauthorized access or disclosure of the data. Integrity is the process of ensuring that the data is not modified or corrupted during the transmission. Availability, accountability, or risk management are not security features supported by the SSH version 2 protocol, as they are more related to the network infrastructure, audit, or assessment aspects of security. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 5: Cryptography and Symmetric Key Algorithms, page 272; CISSP Official (ISC)2 Practice Tests, Third Edition, Domain 4: Communication and Network Security, Question 4.14, page 188.