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

1. When adding additional users to a file's extended ACLs, what is true about the default behaviour of the ACL mask for the file?

A) The mask is left unchanged.
B) If required, a warning is printed indicating that the mask is too restrictive for the permissions being granted.
C) The mask is modified to be the union of all permissions of the file owner, owning group and all named users and groups.
D) The mask is modified to be the union of all permissions of the owning group and all named users and groups.

2. Which of the following are builtin chains for the iptables nat table? (Select THREE correct answers)

A) POSTROUTING
B) PREROUTING
C) OUTPUT
D) INPUT
E) PROCESSING

3. An unprivileged user issued a command which produced the following log message:
avc: denied { getattr } for pid=984 exe=/usr/bin/vim path=/etc/shadow dev=03:01 ino=134343
scontext=hugh:user_r:user_t tcontext=system_u:object_r:shadow_t tclass=file
What does the message mean?

A) User hugh was not running in a security context that permitted writing to the file.
B) User hugh was not running in a security context that permitted reading the file.
C) The security context for hugh is misconfigured and needs access to read any system file.
D) User hugh only needs to switch to the object_r role in order to edit /etc/shadow.

4. An administrator has created a mapping with the following command:
cryptsetup luksOpen /dev/sda1 cryptvol and has set three different keys. Which command below will delete the first key?

A) cryptsetup luksDelKey /dev/mapper/cryptvol 0
B) cryptsetup luksDelKey /dev/sda1 0
C) cryptsetup luksDelKey /dev/mapper/cryptvol 1
D) cryptsetup luksDelKey /dev/sda1 1

5. 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.

Solutions: