IPA IP 2024 Question 70

A question IPA Japan published in 令和6年度 ITパスポート試験公開問題問70, translated into English. ITPEC is based on the same exams.

Which of the following is an appropriate effect that is obtained by making the ESSID stealth?

a)Communication between the access point and terminals can be encrypted.b)Terminals that connect to the access point can be authenticated.c)The risk of unauthorized connection to the access point can be reduced.d)Terminals can communicate directly with each other without going through the access point.

Explanation

It reduces the risk of unauthorized connection to the access point — a stealth ESSID is not announced, so outsiders do not easily find the network.

The ESSID is the name that identifies a wireless LAN. Normally the access point broadcasts it in its beacons, and every nearby device lists it among the available networks. ESSID stealth stops this broadcast: only users who already know the name can enter it and connect, so casual connection attempts by third parties become less likely. It is a supplementary measure only, since the name can still be captured from the traffic of legitimate terminals; it is used together with encryption and authentication.

Answer (c)

Why not others:

•(a) — encrypting the radio traffic is done by WPA2 or WPA3, not by hiding the network name
•(b) — authenticating terminals is done by a pre-shared key, IEEE 802.1X or similar; ESSID stealth checks nothing about the terminal
•(d) — terminals talking directly without an access point is ad hoc mode (or Wi-Fi Direct)

Key rule: ESSID stealth only hides the network’s name; encryption and authentication still need WPA2/WPA3.

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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.