問86
頻出度★☆☆
全文検索型検索エンジンの検索データベースを作成する際に用いられ, Web ページを自動的に巡回・収集するソフトウェアはどれか。
平成28年度 秋期 ITパスポート試験 問86
ストラテジ系システム戦略 › 情報システム戦略
This question's explanation and your answers so far.
解説
問 86
Incorrectア
CGI (Common Gateway Interface) is a mechanism (interface specification) by which a web server calls an external program to generate a dynamic page. It is not a function that crawls and collects pages, so it is incorrect.
- イ
正解 The correct answer is イ, Crawler. A crawler (also called a spider, bot, or robot) is software that automatically follows the links within web pages to crawl and collect pages, and registers the collected data into the search database (index) of a full-text search engine. It exactly matches the question's description of software that is used when building the search database of a full-text search engine and automatically crawls and collects web pages, so イ is correct.
Incorrectウ
Cross-Site Scripting (XSS) is the name of an attack technique and vulnerability that exploits a web application's vulnerability to embed malicious scripts. It is neither a kind of software nor a tool for crawling and collecting, so it is incorrect.
Incorrectエ
A backdoor is a secret entry point (an illicit intrusion route) that an attacker covertly plants in a system in order to break in illegally at a later time. It has nothing to do with a mechanism for collecting web pages, so it is incorrect.
ここがポイント
- A crawler (spider/bot) is a program that automatically crawls and collects web pages by following links, so that a search engine can build an index (search database) for full-text search.
- The remaining choices are a mechanism for generating dynamic pages (CGI), an attack technique and vulnerability (XSS), and an illicit intrusion route (backdoor); none of them is page-collecting software, which is how they are distinguished.
用語