This LPIC-2 practice question tests your understanding of advanced networking configuration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A Linux router running FRR (Free Range Routing) needs to participate in OSPF with adjacent Cisco routers. Which configuration file should be modified to enable OSPF?
/etc/quagga/ospfd.conf
Why wrong: Legacy path; current FRR uses /etc/frr/.
/etc/network/interfaces
Why wrong: Debian network config, not routing protocol config.
/etc/frr/frr.conf
FRR main configuration file where OSPF, BGP, etc. are defined.
/etc/ospfd.conf
Why wrong: Not a standard path.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
/etc/frr/frr.conf
FRR (Free Range Routing) stores its unified routing protocol configuration in /etc/frr/frr.conf. This file is the primary configuration file for all FRR daemons, including OSPF, and is read by the frr service at startup. Modifying this file and then reloading FRR enables OSPF on the Linux router to peer with adjacent Cisco routers.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
/etc/quagga/ospfd.conf
Why it's wrong here
Legacy path; current FRR uses /etc/frr/.
/etc/network/interfaces
Why it's wrong here
Debian network config, not routing protocol config.
/etc/frr/frr.conf
/etc/ospfd.conf
Why it's wrong here
Not a standard path.
Common exam traps
The trap here is that candidates familiar with the older Quagga project may assume the configuration file is still /etc/quagga/ospfd.conf, but FRR has replaced Quagga and uses /etc/frr/frr.conf as the single configuration file for all routing protocols.
Detailed technical explanation
FRR's frr.conf file supports a unified configuration syntax where OSPF configuration is placed under the 'router ospf' stanza, allowing multiple routing protocols (e.g., BGP, RIP) to coexist in one file. When FRR starts, the ospfd daemon reads frr.conf and applies OSPF-specific sections, enabling dynamic routing with Cisco routers using OSPFv2 (RFC 2328). In production, administrators often use 'vtysh' to modify the running configuration and then write it to frr.conf with 'write memory'.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
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FAQ
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: /etc/frr/frr.conf — FRR (Free Range Routing) stores its unified routing protocol configuration in /etc/frr/frr.conf. This file is the primary configuration file for all FRR daemons, including OSPF, and is read by the frr service at startup. Modifying this file and then reloading FRR enables OSPF on the Linux router to peer with adjacent Cisco routers.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This LPIC-2 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-2 exam.
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