Free 202-450 Questions Attempt

 The Apache HTTPD configuration directive that specifies the RSA private key that was used in the generation of the SSL certificate for the server is SSLCertificateKeyFile1. This directive sets the file path and name of the file containing the server private key2. The private key is used to decrypt the data that is encrypted with the public key contained in the certificate1. The private key must match the certificate, otherwise an error will occur when starting the server2. The other options are not valid directives for Apache HTTPD. References:

• mod_ssl - Apache HTTP Server Version 2.4
• Why is SSLCertificateKeyFile needed for Apache? - Stack Overflow

The doveadm who sub-command shows information about the currently connected users and their sessions. The output includes the following columns:

• user: The username of the connected user.
• ip: The IP address of the client.
• port: The port number of the client.
• service: The name of the Dovecot service, such as imap, pop3, lmtp, etc.
• protocol: The protocol version used by the client, such as IMAP4rev1, POP3, etc.
• pid: The process ID of the Dovecot process that handles the connection.
• type: The type of the connection, such as tcp, ssl, etc.
• state: The state of the connection, such as running, idle, etc.
• since: The time when the connection was established.

References:

• doveadm-who - Dovecot Wiki
• LPIC-2 exam 202 objectives, topic 211.3, “Managing Mailbox Access”

 The required control flag means that the PAM module is essential for the authentication process. If the module fails, the whole authentication fails. However, unlike the requisite control flag, the required control flag does not stop the execution of the remaining modules of the same type. This allows the user to receive feedback from all the modules, such as password expiration warnings or account lockout messages. References:

• Linux Professional Institute LPIC-2 Exam 202-450 Objectives, Topic 211: System Security, Objective 211.2: Configuring PAM, Weight: 5
• PAM Control Flags, System Administration Guide: Security Services, Oracle
• 10.2. About PAM Configuration Files, System-Level Authentication Guide, Red Hat Enterprise Linux 7, Red Hat Customer Portal
• 4. The Linux-PAM configuration file, SCO Group

The commands nc and telnet can be used to connect and interact with remote TCP network services. nc stands for netcat, a utility that can read and write data across network connections using TCP or UDP protocols. telnet is a client-server protocol that allows a user to communicate with a remote host using a virtual terminal. Both commands can be used to test the connectivity and functionality of network services such as web servers, mail servers, FTP servers, etc. by specifying the host name or IP address and the port number of the service. References:

• LPIC-2 exam 201 topics, section 205.1, “Use and configure network monitoring tools”.
• LPIC-2 exam 202 topics, section 208.1, “Implementing a web server”.
• Linux Essentials 010 exam objectives, section 4.3, “Basic network configuration and troubleshooting”.