Free 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 Exam Questions and Answers
LPIC-3: Mixed Environments - Exam 300 - version 3.0 (300-300) is an LPI certification exam. This page has free 300-300 practice questions with answers and explanations, set out the way the real exam asks them, plus a timed 300-300 practice test that scores you against the pass mark.
Candidates comparing 300-300 exam dumps, ExamTopics and other 300-300 practice tests use this page for the answers and explanations behind each question. Download the free 300-300 PDF, then sit the timed 300-300 exam simulation before booking with LPI.
Last updated: November 3, 2026
- Exam code
- 300-300
- Provider
- LPI
- Questions in our bank
- 1000+
- Free to read
- First 10, with answers
- Our test mode duration & pass mark
- 130 mins · 70%
- Verified answers
- Reviewed weekly
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Question #1
Which of the following /etc/fstab entries mounts the share data from the server filesrv.example.com on /mnt/data/ so that each local user accesses the share with his own Kerberos credentials?
Correct answer: D
Explanation
The multiuser mount option lets the kernel keep separate credentials for every local user, and sec=krb5 makes those credentials Kerberos tickets. A credentials file or a fixed username applies one identity to the whole mount, and guest or ntlmssp does not use Kerberos at all.
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Question #2
Which of the following commands checks smb.conf for syntax errors and prints the resulting configuration?
Correct answer: A
Explanation
testparm parses smb.conf, reports errors and unknown parameters, and can dump the effective configuration. net conf list shows the registry configuration, not smb.conf, and smbcontrol only asks running daemons to reread their configuration.
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Question #3
In case the file share definition [projects] path = /srv/projects/ read only = no create mask = 0640 force create mode = 0020 is used, which permissions does a new file get when a client creates it with the permissions 0777?
Correct answer: D
Explanation
Samba first ANDs the client's mode 0777 with create mask 0640, giving 0640, then ORs in force create mode 0020, giving 0660. The mask removes bits and the forced mode adds bits, in that order.
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Question #4
A Samba AD DC named dc1 with the IP address 192.0.2.10 serves the domain example.com using the internal DNS server. In case the commands host -t SRV _ldap._tcp.dc._msdcs.example.com 192.0.2.10 host dc1.example.com 192.0.2.10 lead to the following output: _ldap._tcp.dc._msdcs.example.com has SRV record 0 100 389 dc1.example.com. Host dc1.example.com not found: 3(NXDOMAIN) which of the following commands, run on dc1, correct the problem? (Choose TWO correct answers.)
Select 2 answers.
Correct answer: A, B
Explanation
The SRV record exists but the A record for dc1 is missing. samba-tool dns add creates it directly and samba_dnsupdate --all-names re-registers all records of the DC. rndc applies to BIND9 only, zonecreate makes a new zone, and net ads dns unregister removes records.
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Question #5
Which UID does winbindd assign to the domain user EXAMPLE\usera, whose relative identifier (RID) is 1105, on a domain member using the following configuration? [global] security = ads workgroup = EXAMPLE realm = EXAMPLE.COM idmap config * : backend = tdb idmap config * : range = 10000-19999 idmap config EXAMPLE : backend = rid idmap config EXAMPLE : range = 100000-199999
Correct answer: D
Explanation
The rid backend computes the UID as the lower bound of the domain's range plus the RID: 100000 + 1105 = 101105. The default * range is used only for domains with no specific idmap configuration.
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Question #6
Which helper program does mount invoke to mount a file system of the type cifs? Specify ONLY the command without any path or parameters.
Type your answer, then reveal.
Correct answer: mount.cifs
Explanation
For every file system type, mount looks for a helper named mount.<type>. For cifs this is mount.cifs, which handles options such as credentials, sec and multiuser.
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Question #7
Which parameter in a share definition lists the users who get read-only access to a share which is otherwise writable?
Correct answer: B
Explanation
read list names users and groups restricted to read-only access even when read only = no. write list does the opposite by granting write access on a read-only share, and invalid users denies access entirely.
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Question #8
Given the following entry in /etc/exports: /srv/data/ 192.0.2.0/24(rw,sync,root_squash) Which of the following statements are true? (Choose TWO correct answers.)
Select 2 answers.
Correct answer: C, E
Explanation
rw grants write access to the listed network, and root_squash maps UID 0 on the client to the anonymous user. sync does the opposite of acknowledging early, since the server replies only after data is committed. Hosts not listed in the entry get no access at all, not read-only access.
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Question #9
Which smb.conf parameter holds the DNS name of the Active Directory domain, such as example.com, that a Samba member server joins?
Correct answer: D
Explanation
realm sets the Kerberos realm and DNS name of the AD domain, written in uppercase such as EXAMPLE.COM. workgroup holds the short NetBIOS domain name instead. The other parameters do not name the domain.
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Question #10
Which of the following options can be passed to mount.cifs with -o? (Choose TWO correct answers.)
Select 2 answers.
Correct answer: C, D
Explanation
credentials= names a file holding username and password, and vers= selects the SMB protocol version. nfsvers= belongs to mount.nfs. realm= and share= are not mount.cifs options, because the share is given as the //server/share device argument.
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Discussion
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FAQ
Learn More: https://www.lpi.org/our-certifications/
- Q1: What is the 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 exam?
- A: 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 is a LPI certification exam. Judging by the questions in our bank, it concentrates on samba, domain, directory, commands and active.
- Q2: What topics does the 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 exam cover?
- A: Questions in our 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 bank cluster around samba, domain, directory, commands, active, windows and linux. Working through the full set is the quickest way to find which of these you are weakest on.
- Q3: How should I prepare for 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0?
- A: Work through the 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 practice questions here, checking your answer on each one, then sit the practice test to rehearse the exam under timed conditions before the real thing.
- Q4: Are these real 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 exam questions?
- A: They are drawn from officially released past questions and from community members who have sat 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0. Answers are verified and updated weekly.
- Q5: Where do I register for the 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 exam?
- A: Register through LPI directly. Exampractice is not affiliated with LPI and does not administer the exam.
- Q6: Is there a free 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 sample?
- A: Yes. Every 300-300: LPIC-3: Mixed Environments - Exam 300 - version 3.0 page shows a free sample of real questions. Upgrading opens the full bank and the practice test.