XK0-005 Question #1297: Real Exam Question with Answer & Explanation

The correct answer is D: SSH port forwarding. When a server's application port is blocked by a firewall, SSH port forwarding provides a secure and effective technique to tunnel traffic through an open SSH port to access the blocked service.

Security

Question

Which of the following techniques would BEST allow a client computer to connect to a server that is not normally accessible because the server's application port is blocked by a firewall?

Options

AX11 forwarding
BTCP wrappers
CRDP
DSSH port forwarding

Explanation

When a server's application port is blocked by a firewall, SSH port forwarding provides a secure and effective technique to tunnel traffic through an open SSH port to access the blocked service.

Common mistakes.

A. X11 forwarding is specifically for securely forwarding graphical X Window System sessions over SSH, not for general application port access.
B. TCP wrappers provide host-based network access control (allowing or denying connections based on IP addresses), which would block access, not enable it through a firewall.
C. RDP (Remote Desktop Protocol) is for accessing a graphical desktop environment on a Windows server; it does not inherently bypass firewalls for arbitrary application ports or act as a general tunneling mechanism.

Concept tested. SSH port forwarding (tunneling)

Reference. https://man7.org/linux/man-pages/man1/ssh.1.html

Topics

#SSH#Port Forwarding#Firewall Bypass#Secure Tunnels

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