IPA IP 2024 Question 79
A question IPA Japan published in 令和6年度 ITパスポート試験 公開問題 問79, translated into English. ITPEC is based on the same exams.
Which of the following is located between an internal network of a company, etc. and the Internet, and accesses web servers on the Internet on behalf of PCs on the internal network in order to ensure security?
Explanation
Proxy server — a proxy receives the internal PCs’ requests and accesses web servers on the Internet in their place.
A PC on the internal network sends its request to the proxy server, which sends it on to the web server under its own address and returns the response to the PC. Web servers on the Internet see only the proxy, so the internal PCs are hidden from outside, and every access passes one point where it can be checked: the proxy can block harmful or prohibited sites, keep logs of access, and cache pages that are requested often.
Answer (d)
Why not others:
- •(a) — a DNS server answers which IP address corresponds to a domain name; it does not access web servers for the PCs
- •(b) — an NTP server provides the correct time so that computers can synchronize their clocks
- •(c) — a streaming server delivers video or audio so that it can be played while it is being received
Key rule: A proxy server accesses the Internet on behalf of internal clients: it hides them, filters and logs their access, and caches content.
Networks · AI-written, may contain errors
This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.