暗号化された接続を確立するために、外部向けの Web サーバーに展開する必要があるのは次のどれですか。
正解:A
To establish an encrypted connection (such as HTTPS/TLS) with an externally facing web server, the server must deploy a public key as part of its digital certificate. Clients use the server's public key to initiate secure communication, which is validated by certificate authorities. The server holds the matching private key, but it is the public key that must be made available for encrypted connections to be established. Reference: CompTIA Security+ SY0-701 Official Study Guide, Domain 1.3: "A public key is made available to anyone and is used to establish secure connections with a web server." Exam Objectives 1.3: "Explain the importance of cryptographic concepts."