XK0-002 Linux+
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Note 2: XK0-002 Answers are not shown in demo questions.
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Demo Question 8.
When remotely administering a Linux machine using SSH (Secure Shell), the administrator added a rule to deny traffic on Port 22. SSH is now no longer accepting connections. Which of the following would resolve this problem?
A. Restart the SSH service
B. SSH to Port 23 and remove the rule
C. Remove the rule before it is activated
D. From the system console, remove the Port 22 rule
Display Answer
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Answer: D
Explanation: SSH (Secure Shell) uses the port 22. You can deny ssh login from
remote hosts using TCP wrappers, iptables or other firewall utilities. If you want to
allow the SSH connection from remote hosts remove the rule for 22 port.
Example:
# iptables -t filter -A INPUT -p tcp -dport 22 -j DROP : It drops ssh connection
from all hosts.
# iptables -t filter -L : Lists all iptables filter rules
# iptables -D INPUT RULNUMBER : which removes the rule
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