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100+ Free LFCE Practice Questions

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Which command is used to flush all iptables rules and start with a clean firewall configuration?

A
B
C
D
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2026 Statistics

Key Facts: LFCE Exam

Retired

Exam Status

Linux Foundation (May 1, 2022)

$395

Former Exam Fee

Linux Foundation pricing (when active)

66%

Former Passing Score

Linux Foundation exam guidelines

2 hrs

Former Exam Duration

Linux Foundation exam format

17-20

Performance Tasks

Linux Foundation LFCE exam format

LFCS

Recommended Alternative

Linux Foundation certification catalog

The Linux Foundation Certified Engineer (LFCE) exam was officially retired on May 1, 2022. When active, it was a 2-hour performance-based exam with 17-20 tasks on live Linux systems, testing advanced networking, DNS, DHCP, firewalls, NFS, Samba, Apache, Nginx, Postfix, and security skills. The passing score was 66%. The Linux Foundation recommends LFCS ($445) as the current active certification. These practice questions remain valuable for advanced Linux engineering skill development.

Sample LFCE Practice Questions

Try these sample questions to test your LFCE exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which command displays the current network routing table on a Linux system?
A.netstat -r
B.ip route show
C.arp -a
D.ss -tlnp
Explanation: The 'ip route show' command displays the kernel routing table, showing all configured routes including default gateways, subnet routes, and policy-based routes. It is the modern replacement for the deprecated 'route' command.
2In a BIND DNS server configuration, which record type maps a hostname to an IPv4 address?
A.AAAA
B.A
C.CNAME
D.MX
Explanation: An A record (Address record) maps a domain name to an IPv4 address. It is the most fundamental DNS record type and is used to resolve hostnames to their corresponding IP addresses for network communication.
3Which firewall tool is the default packet filtering framework on modern Linux distributions, replacing iptables?
A.ipchains
B.nftables
C.ufw
D.tcp_wrappers
Explanation: nftables is the modern Linux kernel packet classification framework that replaces iptables, ip6tables, arptables, and ebtables. It provides a unified syntax, better performance, and atomic rule updates for packet filtering and NAT.
4Which Apache HTTP Server directive limits the number of simultaneous client connections to prevent resource exhaustion?
A.DocumentRoot
B.MaxRequestWorkers
C.ServerName
D.ErrorLog
Explanation: MaxRequestWorkers (formerly MaxClients) sets the upper limit on the number of simultaneous requests that will be served. It prevents the server from spawning too many child processes or threads, which could exhaust system memory.
5Which protocol is used by the DHCP server to assign IP addresses to clients on a local network?
A.TCP port 80
B.UDP ports 67 and 68
C.TCP port 443
D.UDP port 53
Explanation: DHCP uses UDP port 67 (server) and UDP port 68 (client) for communication. The use of UDP is necessary because clients do not have IP addresses assigned yet when making initial DHCP requests, making TCP handshakes impossible.
6In Linux, which command creates an NFSv4 export and makes it available to remote clients?
A.mount -t nfs
B.exportfs -ra
C.smbclient
D.showmount -e
Explanation: 'exportfs -ra' re-exports all directories listed in /etc/exports, making NFS shares available to clients without restarting the NFS server. The -r flag re-exports and -a applies to all configured exports.
7Which configuration file defines the zones and trusted sources for the firewalld service on RHEL/CentOS?
A./etc/iptables/rules.v4
B./etc/firewalld/zones/*.xml
C./etc/sysconfig/iptables
D./etc/nftables.conf
Explanation: firewalld stores zone configurations as XML files in /etc/firewalld/zones/. Each zone file defines trusted sources, allowed services, ports, and rich rules. Custom configurations override the defaults in /usr/lib/firewalld/zones/.
8Which Postfix main.cf directive specifies the networks from which the mail server will relay mail?
A.myhostname
B.mynetworks
C.mydestination
D.relayhost
Explanation: The 'mynetworks' parameter in Postfix defines the trusted IP networks that are allowed to relay mail through the server without authentication. Properly configuring this prevents the server from becoming an open relay.
9In Linux networking, what is the purpose of the 'ip addr add' command?
A.To add a static route to the routing table
B.To assign an IP address to a network interface
C.To add a DNS nameserver to resolv.conf
D.To add a firewall rule allowing incoming traffic
Explanation: 'ip addr add' assigns an IP address (with subnet mask) to a specified network interface. Multiple addresses can be assigned to a single interface. Changes made with 'ip addr' are temporary and lost on reboot unless persisted through NetworkManager.
10Which Nginx directive is used to configure a reverse proxy that forwards requests to a backend application server?
A.root
B.proxy_pass
C.listen
D.server_name
Explanation: The 'proxy_pass' directive in Nginx forwards incoming requests to a specified backend server URL. It is the core directive for configuring Nginx as a reverse proxy, load balancer, or API gateway.

About the LFCE Exam

LFCE validated advanced Linux engineering skills including network services, web servers, mail servers, file sharing, and security. Although retired in May 2022, the skills tested remain essential for Linux professionals and are directly applicable to LFCS, RHCE, and real-world Linux administration.

Questions

22 scored questions

Time Limit

2 hours (when active)

Passing Score

66% (when active)

Exam Fee

Retired (was $395) (Linux Foundation)

LFCE Exam Content Outline

~20 questions

Network Administration

IP routing, interface configuration, bridging, bonding, VLANs, traffic control, and diagnostics

~20 questions

Network Services

DNS (BIND), DHCP, NTP (chrony), rsyslog, systemd services, and name resolution

~20 questions

Network Security

nftables, firewalld, iptables, SSH hardening, NAT, VPN (WireGuard), and SSL/TLS certificates

~20 questions

File Services

NFS v4, Samba, autofs, iSCSI, Active Directory integration, and file sharing security

~20 questions

Web & Mail Services

Apache, Nginx, Squid proxy, Postfix SMTP, Dovecot IMAP, virtual hosting, and content filtering

How to Pass the LFCE Exam

What You Need to Know

  • Passing score: 66% (when active)
  • Exam length: 22 questions
  • Time limit: 2 hours (when active)
  • Exam fee: Retired (was $395)

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

LFCE Study Tips from Top Performers

1Focus on hands-on practice: configure BIND DNS, Postfix, NFS, and Samba in a lab environment
2Master firewalld zones and rich rules — these skills transfer directly to LFCS, RHCE, and production Linux
3Practice Apache virtual hosting and Nginx reverse proxy configurations from memory
4Build muscle memory with the ip command suite (ip addr, ip route, ip link, ip neigh)
5Configure a complete mail stack (Postfix + Dovecot) end-to-end to understand SMTP and IMAP integration

Frequently Asked Questions

Is the LFCE exam still available?

No. The Linux Foundation officially retired the LFCE exam on May 1, 2022. The Linux Foundation recommends the LFCS (Linux Foundation Certified System Administrator) as the current active certification.

Are LFCE skills still relevant?

Absolutely. DNS, firewalls, NFS, web servers, mail servers, and network security are foundational Linux engineering skills used daily in production environments. These topics are also covered in LFCS, RHCE, and CompTIA Linux+ exams.

What certification should I pursue instead of LFCE?

The LFCS ($445) from the Linux Foundation or the RHCE (EX294, $500) from Red Hat are the closest active alternatives. Both test hands-on Linux skills in performance-based formats.

Why do you offer LFCE practice questions if the exam is retired?

The advanced Linux engineering topics (DNS, firewalls, NFS, Samba, Apache, Postfix) are timeless skills tested across multiple active certifications. These questions help you build practical knowledge applicable to any Linux engineering role.

How much did the LFCE exam cost when it was active?

The LFCE exam cost $395 with one free retake included. It was a 2-hour performance-based exam with 17-20 hands-on tasks on live Linux systems.

What was the LFCE passing score?

The LFCE required a score of 66% or higher to pass. It tested candidates on Ubuntu, CentOS/RHEL, or openSUSE distributions.