Which option is NOT listed as a technique for bypassing firewalls?

Which option is NOT listed as a technique for bypassing firewalls?

• A. Use a proxy site
• B. Use a VPN to encrypt traffic
• C. Type the IP address in the URL instead of the name
• D. Port scanning

Answer: (D)

Bypassing a firewall is about finding ways to get traffic through the filtering controls. Using a proxy site routes your requests through another server, which can hide your origin and circumvent simple filters. A VPN encrypts your traffic so the firewall can’t easily see or block the contents, helping you reach blocked resources. Typing the IP address in the address bar instead of a domain name can bypass DNS-based blocks because it avoids domain-name resolution that some firewalls enforce. Port scanning, on the other hand, is a reconnaissance step used to identify which ports and services are open on a target. It’s about discovery, not directly evading firewall rules, so it isn’t a technique for bypassing firewalls.

Bypassing a firewall is about finding ways to get traffic through the filtering controls. Using a proxy site routes your requests through another server, which can hide your origin and circumvent simple filters. A VPN encrypts your traffic so the firewall can’t easily see or block the contents, helping you reach blocked resources. Typing the IP address in the address bar instead of a domain name can bypass DNS-based blocks because it avoids domain-name resolution that some firewalls enforce. Port scanning, on the other hand, is a reconnaissance step used to identify which ports and services are open on a target. It’s about discovery, not directly evading firewall rules, so it isn’t a technique for bypassing firewalls.