Find out why a workstation with a correct IP and subnet mask cannot ping the default gateway for the CompTIA A+ Core 1 220-1101 exam. Learn how firewalls blocking ICMP can prevent successful pings even when network settings appear correct.
Table of Contents
Question
A technician is troubleshooting a network where a workstation cannot ping the default gateway (192.168.1.1). The workstation’s IP is 192.168.1.100/24. What is the most likely cause?
A. Incorrect subnet mask
B. Faulty Ethernet cable
C. Disabled network adapter
D. Incorrect gateway address
E. Firewall blocking ICMP
Answer
E. Firewall blocking ICMP
Explanation
If the workstation has a valid IP address in the correct subnet (/24 matches 192.168.1.0 network), the inability to ping the default gateway is often due to a firewall blocking ICMP (ping) traffic, either on the workstation or the gateway.
When a workstation has a valid IP address within the correct subnet (192.168.1.100/24) but cannot ping the default gateway (192.168.1.1), the most likely cause is that a firewall is blocking ICMP (ping) traffic. Both host-based firewalls (on the workstation) and network firewalls (on the gateway) can be configured to block ICMP packets, which prevents ping responses even though other network functions may work normally.
This scenario is common in environments where security policies restrict ICMP to limit network visibility or reduce attack surfaces. Verifying firewall settings and ensuring ICMP echo requests are allowed will restore ping functionality. Other causes such as incorrect subnet mask, faulty cable, or disabled adapter would typically result in broader connectivity issues, not just blocked pings.
CompTIA A+ Core 1 220-1101 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the CompTIA A+ Core 1 220-1101 exam and earn CompTIA A+ Core 1 220-1101 certification.