ISC2 Exam ISSMP Topic 1 Question 18 Discussion

Secure Shell (SSH) is a protocol that provides strong authentication and secure communications over unsecured channels. It uses public key encryption as the main method for user authentication. SSH secures connections over the Internet by encrypting passwords and other data. It also protects networks against IP spoofing, packet spoofing, password sniffing, and eavesdropping. SSH uses TCP port 22 as the default port and operates at the application layer.

SSH protocol has the following three components.

1.Transport layer protocol

2.User authentication protocol

3.Connection protocol

Answer option D is incorrect. TCP port 443 is the default port for Hypertext Transfer Protocol Secure (HTTPS) and Secure Socket Layer (SSL).

Answer option A is incorrect. UDP port 161 is the default port for Simple Network Management Protocol (SNMP).

Answer option C is incorrect. UDP port 138 is the default port for the NetBIOS datagram service.