This LFCS practice question tests your understanding of networking. 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.
Refer to the exhibit.
# /etc/network/interfaces on Debian:
auto eth0
iface eth0 inet static
address 192.168.1.100
netmask 255.255.255.0
gateway 192.168.1.1After configuring the /etc/network/interfaces file as shown, the administrator runs 'ifup eth0'. Which IP address will be assigned to eth0?
Refer to the exhibit.
# /etc/network/interfaces on Debian:
auto eth0
iface eth0 inet static
address 192.168.1.100
netmask 255.255.255.0
gateway 192.168.1.1192.168.1.1
Why wrong: That's the gateway IP.
192.168.1.100
Static IP as configured.
No IP assigned
Why wrong: The interface will get the static IP.
An IP from DHCP
Why wrong: The interface is set to static, not dhcp.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
192.168.1.100
Option B is correct because the configuration in /etc/network/interfaces specifies a static IP address of 192.168.1.100 with the 'address' directive. When 'ifup eth0' is executed, it reads this file and assigns the configured static IP to the interface, ignoring any DHCP settings.
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.
192.168.1.1
Why it's wrong here
That's the gateway IP.
192.168.1.100
Why this is correct
Static IP as configured.
Related concept
Read the scenario before looking for a memorised answer.
No IP assigned
Why it's wrong here
The interface will get the static IP.
An IP from DHCP
Why it's wrong here
The interface is set to static, not dhcp.
Common exam traps
The trap here is that candidates may assume a missing 'dhcp' keyword defaults to DHCP, but the explicit 'static' keyword overrides any implicit behavior, and the 'address' line directly assigns the IP.
Detailed technical explanation
The /etc/network/interfaces file is parsed by ifupdown utilities; the 'auto eth0' line ensures the interface is brought up at boot, while 'iface eth0 inet static' sets the addressing method. The 'address' and 'netmask' directives define the IPv4 address and subnet mask, and 'gateway' sets the default route. In real-world scenarios, misconfiguring the netmask can lead to routing issues, even if the IP is correctly assigned.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LFCS 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
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FAQ
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
The correct answer is: 192.168.1.100 — Option B is correct because the configuration in /etc/network/interfaces specifies a static IP address of 192.168.1.100 with the 'address' directive. When 'ifup eth0' is executed, it reads this file and assigns the configured static IP to the interface, ignoring any DHCP settings.
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
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