問65
頻出度★★☆
通信プロトコルの説明として, 最も適切なものはどれか。
平成28年度 秋期 ITパスポート試験 問65
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 65
Incorrectア
A cable concentrator used to connect devices such as PCs and printers to a LAN describes a physical device, namely a hub (a line concentrator), not a communication protocol. A protocol is an agreement (a set of rules), not the device itself.
Incorrectイ
A description of the location of information specified in a web browser and the method for obtaining it is an explanation of a URL. A URL is a string that indicates the location of the resource to be obtained and how to obtain it, which is different from a protocol that defines the rules for communication as a whole.
Incorrectウ
A number used to identify a computer in Internet communication is an explanation of an IP address. An IP address is an identification number used to specify the communication partner, not the rules (protocol) that define the communication procedure itself.
- エ
正解 A communication protocol is a set of rules agreed upon in advance so that devices can correctly exchange data with one another over a network. When both sides follow common rules for how signals are sent, how data is delimited, how errors are detected, and the communication procedure, devices from different manufacturers or of different models can communicate with each other. A representative example is TCP/IP. Therefore, choice エ, which states that it is a set of rules defined for communicating over a network, is the most appropriate.
ここがポイント
- A communication protocol is a set of rules defined so that devices can communicate with one another over a network. Following common rules makes communication between different types of devices possible (a representative example is TCP/IP).
- Distinguishing confusing terms: a hub (a line concentrator, i.e., a device), a URL (the location of a resource and how to obtain it), and an IP address (a number that identifies a computer) are all concepts separate from a protocol.
用語