LPI 202-450 Exam With Confidence Using Practice Dumps

 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

To prevent anonymous FTP users from listing uploaded file names, the upload directory must not have the read or execute permission set for the anonymous user or group. The read permission allows the user to view the contents of a file or directory, while the execute permission allows the user to enter or search a directory. Therefore, removing both permissions will prevent the user from accessing or listing the files in the upload directory. However, the write permission can be left on, as it allows the user to create or modify files in the directory, which is the purpose of an upload directory. References:

• LPIC-2 Exam 202-450 Objectives, Topic 211: File Sharing, Objective 211.2: Manage FTP Service, Weight: 3
• LPIC-2 Linux Professional Institute Certification Study Guide: Exam 201 and Exam 202, Chapter 9: File Sharing, FTP, p. 353-354
• Linux File Permissions Explained, Read, Write, and Execute Permissions, p. 2-4

 The host allow option in the smb.conf file specifies the hosts or networks that are allowed to access the Samba server. The hosts can be specified by name, IP address, or network address with a netmask. The host allow option can also include the special name localhost, which refers to the local machine. The host allow option can be overridden by the host deny option, which specifies the hosts or networks that are denied access to the Samba server. The host deny option has a higher priority than the host allow option.

In this question, the host allow option is set to 192.168.1.100 192.168.2.0/24 localhost, which means that only the host with the IP address 192.168.1.100, the hosts on the network 192.168.2.0/24 (from 192.168.2.1 to 192.168.2.254), and the local machine can access the Samba server. This explains why a wireless laptop with an IP address 192.168.2.93 can access the Samba server, but a workstation on the wired network with an IP address 192.168.1.177 cannot. Almost every machine on the wired network is unable to access the Samba server because they are not included in the host allow option.

To fix this problem, the host allow option should be changed to include the entire wired network, which is assumed to be 192.168.1.0/24 (from 192.168.1.1 to 192.168.1.254). This can be done by using the network address and the netmask, or by using a range of IP addresses. The host allow option should also keep the wireless network and the localhost in the list, so that the existing access is not denied. Therefore, the correct answer is E. host allow = 192.168.1.0/255.255.255.0 192.168.2.0/255.255.255.0 localhost. This will allow any host on either network, or the local machine, to access the Samba server, without denying access to anyone else.