IPA IP 2023 Question 83
A question IPA Japan published in 令和5年度 ITパスポート試験 公開問題 問83, translated into English. ITPEC is based on the same exams.
Same question on ITPEC: Apr 2025 Q34
Which of the following is a technology that is used to make voice calls over the Internet by two (2) parties using the same application on their smartphones or other devices?
Explanation
VoIP — Voice over Internet Protocol, carrying voice calls as IP packets.
A VoIP application digitises the speaker's voice, splits it into packets and sends them over the Internet; the other party's application reassembles them into sound. Messaging and call apps on smartphones use it, so two users of the same app can talk over the Internet, often without telephone call charges.
Answer (d)
Why not others:
- •(a) MVNO — Mobile Virtual Network Operator, a company that sells mobile service (its own SIM cards) over lines rented from a carrier; a business form, not a call technology
- •(b) NFC — Near Field Communication, contactless data exchange over a few centimetres, used for payment cards and phones held to a reader
- •(c) NTP — Network Time Protocol, which synchronises computers' clocks over a network
Key rule: VoIP turns voice into data on an IP network; because voice needs steady delivery, call quality depends on delay and jitter more than on bandwidth.
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.