問71
頻出度★★★
インターネット上にある情報の所在を表す記述方式で,“http://www.ipa.go.jp/”のような形式をもつものはどれか。
平成24年度 秋期 ITパスポート試験 問71
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 71
Incorrectア
HTML (HyperText Markup Language) is a markup language that uses tags to describe the structure of a web page, such as headings, paragraphs, links, and images. It defines how the contents of a page are written, not where the page is located, so it does not take a form like the example “http://www.ipa.go.jp/”.
Incorrectイ
An IP address is an identification number assigned to a device connected to a network; in IPv4 it takes a form such as “192.0.2.1”, with numbers separated by periods. It is related to a URL in that it indicates a location, but its format is completely different, and it has no scheme name or path. The host name in a URL is converted into an IP address by DNS before it is used — that is the relationship between the two.
Incorrectウ
A MAC address is a unique identification number assigned at manufacturing time to the network interface (NIC) of a device that connects to a LAN, and it takes a form such as “00-11-22-33-44-55”, with hexadecimal numbers separated by delimiters. It is used to identify a device within the same network, not to describe the location of information on the Internet.
- エ
正解 The correct answer is エ, URL (Uniform Resource Locator). A URL is a notation that uniquely expresses where on the Internet a piece of information (a resource) is placed and by which method it is provided. The example “http://www.ipa.go.jp/” is made up of three elements: the scheme name “http”, which shows the communication method; the host name “www.ipa.go.jp”, which shows the server where the resource is placed; and the path “/”, which shows the location inside that server. This is exactly the typical format of a URL. It is the string you type into the address bar of a web browser, and the browser uses this URL as the clue to connect to the target server and fetch the page.
ここがポイント
- A URL is a notation that expresses the location of a resource on the Internet as “scheme name + host name (domain name) + path”. That string you type into a browser address bar is a URL.
- Distinguish the three easily confused identifiers and language by their roles: HTML = the language that describes the contents of a page; IP address = the number that identifies a device on a network; MAC address = the hardware identification number unique to a NIC.
用語