EC-Council
312-50V9 · Question #491
312-50V9 Question #491: Real Exam Question with Answer & Explanation
The correct answer is B: 127.0.0.1. The IPv4 loopback address 127.0.0.1 causes a computer to route traffic back to itself, so a browser using it as a proxy is treating the local machine as the proxy server.
Question
While checking the settings on the internet browser, a technician finds that the proxy server settings have been checked and a computer is trying to use itself as a proxy server. What specific octet within the subnet does the technician see?
Options
- A10.10.10.10
- B127.0.0.1
- C192.168.1.1
- D192.168.168.168
Explanation
The IPv4 loopback address 127.0.0.1 causes a computer to route traffic back to itself, so a browser using it as a proxy is treating the local machine as the proxy server.
Common mistakes.
- A. 10.10.10.10 is a routable private IP address in the class A RFC 1918 range that identifies a specific remote host, not the local machine.
- C. 192.168.1.1 is a private IP address typically assigned to a default gateway or home router and does not refer to the local host.
- D. 192.168.168.168 is an arbitrary private IP address that could belong to any device on the local network and has no special loopback meaning.
Concept tested. IPv4 loopback address identifying local host as proxy
Reference. https://www.rfc-editor.org/rfc/rfc5735
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