問73
頻出度★★★
膨大な数の IoT デバイスをインターネットに接続するために大量の IP アドレスが必要となり，IP アドレスの長さが128ビットで構成されているインターネットプロトコルを使用することにした。このプロトコルはどれか。
令和4年度 ITパスポート試験 問73
テクノロジ系ネットワーク › ネットワーク応用
This question's explanation and your answers so far.
解説
問 73
Incorrectア
IPv4 has a 32-bit address length, so it can represent only about 2 to the 32nd power (about 4.3 billion) addresses. It is not 128 bits and falls short of the huge address demand in the IoT era, so it is wrong. In fact, IPv6 was created precisely to solve this address exhaustion.
Incorrectイ
IPv5 is not a protocol that was standardized and widely adopted as a general-purpose addressing Internet protocol (version number 5 was merely once assigned to an experimental streaming protocol). It is not the standard IP with 128-bit addresses, so it is wrong.
- ウ
正解 The correct answer is ウ, IPv6. IPv6 has a 128-bit address length and can represent an enormous number of IP addresses — about 2 to the 128th power. Because it has a vast address space that will not run out even when a huge number of IoT devices are connected directly to the Internet, it exactly matches the condition in the question that the address length is 128 bits and a large number of IP addresses is needed. Therefore ウ is correct.
Incorrectエ
There is no standard Internet protocol called IPv8. It is a name that does not actually exist and is not a 128-bit address standard either, so it is wrong.
ここがポイント
- IPv6 has a 128-bit address length while IPv4 has 32 bits. Keep in mind this difference in length and the point that IPv6 was introduced to make up for IPv4 address exhaustion.
- 128-bit IPv6 has an enormous address space of about 2 to the 128th power and can accommodate the connection of large numbers of IoT devices.
用語