A Linux system administrator is troubleshooting a network connectivity issue from their workstation (192.168.10.20). They are unable to get a response when they run the command ping 192.168.10.105. However, a second command, ping 192.168.10.106, to a different server on the same subnet succeeds. The administrator has already confirmed that the local firewall on their workstation is not blocking any outbound traffic. Which of the following is the MOST likely cause of the issue?
A DNS resolution failure is preventing the connection to the server.
The network interface on the administrator's workstation is disabled.
A firewall on the destination server (192.168.10.105) is blocking ICMP echo requests.
An incorrect default gateway is configured on the administrator's workstation.
The correct answer is that a firewall on the destination server (192.168.10.105) is blocking ICMP echo requests. Since the administrator can successfully ping another server (192.168.10.106) on the same subnet, it confirms that the local workstation's network interface, IP configuration, and the physical network path are functioning correctly. The problem is specific to the target server. A common reason for a single host to be unresponsive to pings, while others on the same network are reachable, is a host-based firewall (like firewalld or iptables) configured to drop incoming ICMP packets. An incorrect default gateway would affect communication to different networks, not hosts on the same local subnet. Since the ping is directed to an IP address, DNS is not used for resolution. The network interface on the workstation must be active to have successfully pinged the other server.
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What is ICMP and why is it used in network troubleshooting?
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