50 Free LPIC-3 Practice Questions — Linux Professional Institute

Preparing for LPIC-3? These free questions cover the LPIC-3 specialization exams (300, 303, 304).

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Domain: Mixed Environments — Samba (Questions 1–20)

Question 1

Which Samba service provides Active Directory domain controller functionality?

a) smbd
b) nmbd
c) samba-ad-dc
d) winbindd

Show Answer

Answer: c) samba-ad-dc

Explanation: The samba-ad-dc service provides AD Domain Controller with LDAP, Kerberos, DNS, and authentication. smbd provides file/print services, nmbd provides NetBIOS, winbindd integrates with AD.

Question 2

Which command joins a Linux machine to a Samba Active Directory domain?

a) net ads join
b) realm join
c) samba-tool domain join
d) Both a and b

Show Answer

Answer: d) Both a and b

Explanation: net ads join (classic Samba) and realm join (SSSD/realmd) are both used to join Linux to AD domains. realm join is preferred on modern systems.

Questions 3–20

[Full set covers Samba shares, user mapping, file permissions, NT ACLs, WINS, and BIND DLZ]

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Domain: Security (Questions 21–35)

Question 3

Which OpenVPN mode tunnels both IPv4 and IPv6?

a) TUN (tunnel)
b) TAP (bridge)
c) Both support both protocols
d) Neither

Show Answer

Answer: a) TUN (tunnel)

Explanation: OpenVPN TUN mode operates at Layer 3 and tunnels IP packets. TAP operates at Layer 2 (bridges Ethernet). TUN is more common for VPNs.

Question 4

Which GPG command encrypts a file for a recipient?

a) gpg -e -r recipient file
b) gpg --encrypt -r recipient file
c) gpg -c -r recipient file
d) gpg -s -r recipient file

Show Answer

Answer: a) gpg -e -r recipient file

Explanation: -e encrypts, -r specifies the recipient (by key ID or email). -c is symmetric encryption. -s signs. -d decrypts.

Questions 5–35

[Full set covers OpenVPN, IPsec, GPG, OpenSSL, CA management, certificates, Apache security, and iptables/nftables]

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Domain: Virtualization and HA (Questions 36–50)

Question 5

Which KVM command lists running virtual machines?

a) virsh list
b) virsh list --all
c) kvm list
d) qemu-list

Show Answer

Answer: a) virsh list

Explanation: virsh list shows running VMs. virsh list --all includes stopped VMs. virsh manages libvirt-based virtualization.

Question 6

Which Pacemaker command shows cluster status?

a) pcs status
b) crm_mon
c) pacemaker status
d) Both a and b

Show Answer

Answer: d) Both a and b

Explanation: pcs status (Pacemaker/Corosync stack) and crm_mon (older CRM) both show cluster status, node health, and resource states.

Questions 7–50

[Full set covers KVM, libvirt, Pacemaker, DRBD, LVS, migration, HA services, and fencing]

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