IPA IP 2026 Question 64

A question IPA Japan published in 令和8年度 ITパスポート試験公開問題問64, translated into English. ITPEC is based on the same exams.

Which of the following is an appropriate explanation of carrier aggregation?

a)A technology that switches the base station to which a mobile phone connects while it is movingb)A technology that enhances the security functions of mobile phone communicationc)A technology that speeds up wireless communication by bundling radio waves of multiple different frequenciesd)A technology in which terminals communicate with each other via a base station called an access point in a wireless LAN

Explanation

Bundling radio waves of several frequencies to speed up wireless communication — carrier aggregation combines carriers into one wider channel.

A carrier is a radio wave in one frequency band. In carrier aggregation, used from LTE-Advanced onward and in 5G, a terminal communicates over several carriers of different frequencies at the same time and treats them as one wide band. A wider band carries more data per second, so the communication speed rises.

Answer (c)

Why not others:

•(a) — switching the base station a moving phone is connected to is handover
•(b) — enhancing the security of mobile communication (encryption, authentication) is not what carrier aggregation does; it is about speed
•(d) — terminals communicating through an access point on a wireless LAN is infrastructure mode

Key rule: Carrier aggregation = several frequency bands used together for higher speed; handover = changing base stations while moving.

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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.