The correct answer is that the /etc/hosts file is used to resolve hostnames to IP addresses, with the standard entry '127.0.0.1 localhost' defining the IPv4 loopback interface. This file is consulted by the system's resolver library before any DNS queries are made, allowing local overrides for hostname resolution and providing a static, administrator-controlled mapping that bypasses network-based name servers. On the Linux Professional Institute Certification Level 2 LPIC-2 exam, this concept tests your understanding of the order of name resolution as defined in /etc/nsswitch.conf, where the 'hosts' line typically lists 'files' before 'dns'; a common trap is assuming DNS is always checked first, or forgetting that the /etc/hosts file can block or redirect specific domains. For the exam, remember that localhost is always defined here, and any entry in this file takes precedence over DNS queries. A helpful memory tip is "Files first, then DNS" — think of /etc/hosts as the local override authority that always gets the first look.
LPIC-2 Advanced Networking Configuration Practice Question
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.
Which TWO statements about the /etc/hosts file are true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It can contain a line like '127.0.0.1 localhost'.
Option A is correct because the /etc/hosts file maps hostnames to IP addresses, and the line '127.0.0.1 localhost' is the standard entry for the IPv4 loopback interface. This file is consulted by the system's resolver library before DNS queries are made, allowing local overrides for hostname resolution.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
It can contain a line like '127.0.0.1 localhost'.
Why this is correct
Common entry for loopback.
Related concept
Read the scenario before looking for a memorised answer.
✓
It is used to resolve hostnames to IP addresses.
Why this is correct
Primary function.
Related concept
Read the scenario before looking for a memorised answer.
By default, /etc/hosts is checked before DNS (order in /etc/nsswitch.conf).
✗
It can define aliases for network interfaces.
Why it's wrong here
Aliases are defined in /etc/network/interfaces or using ip command.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume /etc/hosts is consulted after DNS due to its static nature, but the default NSS order places it before DNS, and the file does not configure DNS servers or network interface aliases.
Trap categories for this question
Command / output trap
Aliases are defined in /etc/network/interfaces or using ip command.
Detailed technical explanation
How to think about this question
Under the hood, the glibc resolver uses the Name Service Switch (NSS) to determine the order of lookup sources; the default 'hosts: files dns' in /etc/nsswitch.conf ensures /etc/hosts is checked first. A real-world scenario where this matters is during network troubleshooting or when a DNS server is unreachable—local entries in /etc/hosts can provide fallback resolution for critical hosts. Additionally, the file supports IPv6 entries (e.g., '::1 localhost') and can include multiple aliases on the same line after the primary hostname.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the LPIC-2 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It can contain a line like '127.0.0.1 localhost'. — Option A is correct because the /etc/hosts file maps hostnames to IP addresses, and the line '127.0.0.1 localhost' is the standard entry for the IPv4 loopback interface. This file is consulted by the system's resolver library before DNS queries are made, allowing local overrides for hostname resolution.
What should I do if I get this LPIC-2 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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