IPA IP 2020 Question 75
A question IPA Japan published in 令和2年度 10月 ITパスポート試験 公開問題 問75, translated into English. ITPEC is based on the same exams.
Same question on ITPEC: Apr 2025 Q32
Which of the following is an appropriate example of an IPv4 IP address that is assigned to a PC?
Explanation
10.123.45.67 — four decimal numbers from 0 to 255 separated by dots, the form of an IPv4 address.
An IPv4 address is 32 bits, written as four 8-bit parts in decimal (dotted decimal notation), each 0–255. All four parts of 10. are in range. It also falls in 10.–10., a private address range, so it is the kind of address a PC on a company or home LAN is given.
Answer (c)
Why not others:
- •(a) — six two-digit hexadecimal groups, 48 bits, the form of a MAC address, which identifies a network card rather than a host on the Internet
- •(b) — the form of a telephone number
- •(d) — a URL, naming the protocol and the host by domain name; DNS turns the name into an IP address
Key rule: IPv4 is 32 bits in four decimal parts, IPv6 is 128 bits in eight hexadecimal groups, and a MAC address is 48 bits in six hexadecimal pairs.
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.