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Lpi LPI Level 3 Exam (LPI 303: Security) Sample Questions:

1. What does the following iptables rule accomplish:
iptables A INPUT s !127.0.0.0/8 p tcp dport 111 j DROP

A) Drops all packets originating from the local machine unless they are destined for port 111.
B) Drops all packets destined for port 111 which originate from the local machine.
C) Drops all packets from the LAN destined for port 111.
D) Drops all packets destined for port 111 unless they are from the local machine.

2. What can proxymap be used for in a Postfix installation? (Select TWO correct answers)

A) Mapping mail user IDs to system accounts.
B) Creating and querying Postfix lookup tables.
C) Creating and querying Postfix alias databases.
D) Consolidating the number of open lookup tables.
E) Overcoming chroot restrictions.

3. How does AppArmor configure its access control settings?

A) AppArmor relies on precompiled policies. These policies are updated with new releases or can be downloaded periodically.
B) A profile is assigned per application that specifies the system resources available to the application.
C) AppArmor does not require any configuration.
D) AppArmor inspects the Linux system to determine which applications are installed and configures itself. This configuration can then be modified manually.

4. By default, when verifying a signed file or a file with a detached signature, which keyring is used to search for public keys?

A) ~/.gnupg/secring.gpg
B) ~/.gnupg/trustdb.gpg
C) ~/.gnupg/trustedkeys.gpg
D) ~/.gnupg/pubring.gpg

5. How are SELinux permissions related to standard Linux permissions?

A) SELinux permissions override standard Linux permissions.
B) Standard Linux permissions override SELinux permissions.
C) SELinux permissions are verified before standard Linux permissions.
D) SELinux permissions are verified after standard Linux permissions.

Solutions: