Quick Answer
The answer is `nmcli connection modify enp1s0 ipv4.addresses 192.168.1.100/24` because this command directly sets the static IPv4 address property within the NetworkManager connection profile for the interface, ensuring the configuration persists across reboots. In RHEL 9, NetworkManager controls network settings through connection profiles, and modifying the `ipv4.addresses` property with the CIDR notation is the standard method to assign a static IP, as opposed to using `ip addr add` which only applies a temporary address. On the Red Hat Certified System Administrator EX200 exam, this task tests your ability to configure static IP addresses using nmcli without relying on GUI tools or deprecated network scripts. A common trap is forgetting to also set the `ipv4.method` to `manual` and the `ipv4.gateway`; without these, the static address may not activate correctly. Memory tip: think "modify the method to manual, then modify the address" — or simply remember "nmcli con mod [interface] ipv4.addresses [IP/prefix]".
This EX200 practice question tests your understanding of deploy, configure, and maintain systems. 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 technician needs to configure a static IPv4 address on a RHEL 9 network interface 'enp1s0' using NetworkManager. Which command should be used to set the IP address?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
nmcli connection modify enp1s0 ipv4.addresses 192.168.1.100/24
This makes a persistent change via NetworkManager.
nmtui edit enp1s0 --ipv4 192.168.1.100/24
Why wrong: nmtui is interactive; it doesn't take arguments like that.
ip addr add 192.168.1.100/24 dev enp1s0
Why wrong: This is temporary and not persistent.
ifconfig enp1s0 192.168.1.100 netmask 255.255.255.0
Why wrong: This is temporary and deprecated.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
nmcli connection modify enp1s0 ipv4.addresses 192.168.1.100/24
Option A is correct because `nmcli connection modify enp1s0 ipv4.addresses 192.168.1.100/24` is the proper NetworkManager command to set a static IPv4 address on a RHEL 9 interface. This command modifies the connection profile for 'enp1s0' by setting the `ipv4.addresses` property to the specified address and prefix length, which is the standard method for persistent static IP configuration via NetworkManager.
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.
nmcli connection modify enp1s0 ipv4.addresses 192.168.1.100/24
Why this is correct
This makes a persistent change via NetworkManager.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
nmtui edit enp1s0 --ipv4 192.168.1.100/24
Why it's wrong here
nmtui is interactive; it doesn't take arguments like that.
ip addr add 192.168.1.100/24 dev enp1s0
Why it's wrong here
This is temporary and not persistent.
ifconfig enp1s0 192.168.1.100 netmask 255.255.255.0
Why it's wrong here
This is temporary and deprecated.
Common exam traps
The trap here is that candidates often confuse temporary runtime commands (like `ip addr add` or deprecated `ifconfig`) with persistent configuration tools required by NetworkManager, or they misuse `nmtui` syntax expecting inline arguments instead of its interactive interface.
Detailed technical explanation
NetworkManager stores connection profiles in `/etc/NetworkManager/system-connections/` as keyfile or ifcfg files. Using `nmcli connection modify` updates these profiles and automatically applies the changes if the connection is active, or on next activation. The `ipv4.addresses` property accepts CIDR notation (e.g., 192.168.1.100/24), and you must also set `ipv4.method` to `manual` for static addressing; otherwise, the address may be ignored if the method is left as `auto` (DHCP).
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 segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
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FAQ
Deploy, configure, and maintain systems — This question tests Deploy, configure, and maintain systems — Read the scenario before looking for a memorised answer..
The correct answer is: nmcli connection modify enp1s0 ipv4.addresses 192.168.1.100/24 — Option A is correct because `nmcli connection modify enp1s0 ipv4.addresses 192.168.1.100/24` is the proper NetworkManager command to set a static IPv4 address on a RHEL 9 interface. This command modifies the connection profile for 'enp1s0' by setting the `ipv4.addresses` property to the specified address and prefix length, which is the standard method for persistent static IP configuration via NetworkManager.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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