CompTIA Network+ (N10-008) — Question 553

A network technician is troubleshooting a connection to a web server. The technician is unable to ping the server but is able to verify connectivity to the web service using Telnet. Which of the following protocols is being blocked by the firewall?

Answer options

• A. UDP
• B. ARP
• C. ICMP
• D. TCP

Correct answer: C

Explanation

The correct answer is C, ICMP, as ping uses ICMP packets to check connectivity. Since the technician can connect using Telnet, it indicates that the TCP protocol is functioning properly, ruling out option D. Options A and B are not relevant to the ping operation, as UDP does not handle ping requests and ARP is used for resolving IP addresses to MAC addresses.