問77
頻出度★★☆
通信プロトコルに関する記述のうち, 適切なものはどれか。
平成27年度 秋期 ITパスポート試験 問77
テクノロジ系ネットワーク › 通信プロトコル
This question's explanation and your answers so far.
解説
問 77
Incorrectア
Analog communication also has agreements (protocols) such as modulation schemes and send/receive procedures. Protocols are not exclusive to digital communication, so this statement is wrong.
Incorrectイ
Besides standards set by international organizations such as ISO and ITU, vendor-specific agreements defined independently by particular manufacturers are also called communication protocols. Limiting the source to international organizations is the error.
Incorrectウ
A communication protocol defines not only the operating procedures for normal conditions but also the procedures for handling abnormal conditions, such as detecting communication errors, retransmission, and timeouts. Stating that it covers only normal conditions is the error.
- エ
正解 A communication protocol is a common set of rules (procedures and data formats) agreed upon in advance so that devices can exchange data with each other. As long as both devices follow the same protocol, the procedures for sending and receiving and the interpretation of the data match, so even devices from different manufacturers or with different operating systems (OS) can communicate. This is exactly the purpose of standardizing protocols; for example, if TCP/IP is implemented, communication can be established even between devices with different underlying foundations, such as Windows and Linux. Therefore “エ” is appropriate.
ここがポイント
- A communication protocol is a common agreement (procedures and data formats) for devices to communicate; with the same protocol, devices from different manufacturers and with different operating systems can still communicate with each other.
- Protocols exist both as international standards (e.g., TCP/IP, HTTP) and as manufacturers' proprietary specifications, and they include procedures for abnormal conditions, not just normal ones.
用語