Free LPI 300-300 Practice Exam with Questions & Answers | Set: 2

The SMB protocol (Server Message Block) is used for providing shared access to files and printers.

Historically, SMB ran on top of NetBIOS over TCP/IP using port 139.

SMB can also run directly over TCP/IP without the NetBIOS layer, which uses port 445.

Therefore, TCP port 445 is used to provide the SMB protocol without NetBIOS.

References

Official IANA port numbers: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

Microsoft documentation on SMB:https://docs.microsoft.com/en-us/windows/win32/fileio/microsoft-smb-protocol-and-cifs-protocol-overview

Adding SSSD to /etc/nsswitch.conf:

To include SSSD (System Security Services Daemon) as a source of information in the/etc/nsswitch.conffile, the service namesssmust be added. This is specified without any parameters. Thesssservice allows the system to retrieve information from various sources, such as LDAP, Kerberos, and others, as configured in SSSD.

References:

SSSD documentation

nsswitch.confconfiguration guidelines

An LDIF (LDAP Data Interchange Format) file is used to represent directory entries in LDAP (Lightweight Directory Access Protocol).

Each entry in an LDIF file starts with thedn(Distinguished Name) attribute, which uniquely identifies the entry in the directory.

Thednattribute is mandatory and specifies the path to the entry within the LDAP directory.

References

LDAP documentation: https://ldap.com/ldap-data-interchange-format-ldif/

OpenLDAP LDIF documentation: https://www.openldap.org/doc/admin24/ldif.html

The effective permissions of a file created with the permissions777can be calculated considering thecreate maskandforce create mode.

create mask = 711implies that the permission bits are ANDed with 0711, i.e., only the owner can read, write, and execute.

force create mode = 750implies that certain permission bits are always set, specifically 0750, i.e., read, write, and execute for the owner, and read and execute for the group.

Thecreate maskreduces the permissions to 0711, and thenforce create modeadds the 0750 mask to the result.

Original permission:777AND withcreate mask (711):711OR withforce create mode (750):751

Thus, the effective permission is751.

References:

Samba smb.conf man page - create mask

In the context of a Samba configuration for printer shares, the[printers]section usually requires theprintable = yesdirective to indicate that the share is meant for printing. Without this directive, Samba would not treat the share as a printer share, even if other settings likepathare configured properly.

The given snippet is:

The lineprintable = yesis missing and is essential for defining a printer share.

References:

Samba Official Documentation - Printer Sharing