ユーザーはラップトップを旅行に持ち出し、空港にいる間にネットワーク パラメータを変更しました。ユーザーはすべてのインターネット Web サイトにアクセスできますが、企業イントラネット Web サイトにはアクセスできません。問題の原因として最も考えられるのは次のうちどれですか?
正解:C
Explanation DNS (Domain Name System) is a service that translates domain names into IP addresses. Corporate intranet websites are usually hosted on private IP addresses that are not accessible from the public internet. Therefore, the user's laptop needs to use the correct DNS server that can resolve the intranet domain names to the private IP addresses. If the user changed the network parameters at the airport and did not revert them back, the laptop might be using a public DNS server that does not have the records for the intranet websites. This would cause the user to access all internet websites but not corporate intranet websites. References: An Overview of DNS - N10-008 CompTIA Network+ : 1.61 DNS Configuration - CompTIA A+ 220-11012 CompTIA Network+ Certification Exam Objectives, page 53