- A
nmcli con add type bond ifname bond0; nmcli con add type ethernet ifname eth0 master bond0 slave-type bond
Why wrong: This syntax uses `type ethernet` with `master bond0 slave-type bond`, which is a valid way to add a slave, but it is less direct than the dedicated bond-slave type. More importantly, the bond is created without specifying `mode active-backup`, so the requirement is not fully met. Among the options, D is preferred.
- B
Edit /etc/sysconfig/network-scripts/ifcfg-bond0 and ifcfg-eth0 manually
Why wrong: Manual editing of configuration files is a possible method, but it is not a set of commands and is deprecated in favor of nmcli. The question asks for a set of commands, making this option incorrect.
- C
teamd -d -c '{"device":"bond0","runner":{"name":"activebackup"},"ports":{"eth0":{},"eth1":{}}}'
Why wrong: This command uses teamd for teaming, not bonding. The question specifically requires a bond interface using active-backup mode, so this is incorrect.
- D
nmcli con add type bond ifname bond0; nmcli con add type bond-slave ifname eth0 master bond0
This option correctly creates the bond interface with `nmcli con add type bond ifname bond0` and adds eth0 as a slave using `type bond-slave`, which is a native nmcli connection type for bond slaves. It directly fulfills the requirement of creating a bond with a slave interface, and the mode can be set separately.
How to Create a Network Bond with Active-Backup Mode Using nmcli
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. A key principle to apply: network Bonding. 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.
An administrator needs to create a network bond interface 'bond0' with two slave interfaces 'eth0' and 'eth1' using active-backup mode. Which set of commands is correct?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
nmcli con add type bond ifname bond0; nmcli con add type bond-slave ifname eth0 master bond0
Option D is correct because it uses `nmcli con add type bond ifname bond0` to create the bond interface and then `nmcli con add type bond-slave ifname eth0 master bond0` to add eth0 as a slave using the dedicated bond-slave type. While the mode (active-backup) is not specified in the commands, among the options, D is the only one that uses a direct and valid bond-slave type. Option A uses `type ethernet` with `slave-type bond`, which is also valid but less direct. Option B involves manual editing, and option C uses teamd for teaming, not bonding.
Key principle: Network Bonding
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
nmcli con add type bond ifname bond0; nmcli con add type ethernet ifname eth0 master bond0 slave-type bond
Why it's wrong here
This syntax uses `type ethernet` with `master bond0 slave-type bond`, which is a valid way to add a slave, but it is less direct than the dedicated bond-slave type. More importantly, the bond is created without specifying `mode active-backup`, so the requirement is not fully met. Among the options, D is preferred.
- ✗
Edit /etc/sysconfig/network-scripts/ifcfg-bond0 and ifcfg-eth0 manually
Why it's wrong here
Manual editing of configuration files is a possible method, but it is not a set of commands and is deprecated in favor of nmcli. The question asks for a set of commands, making this option incorrect.
- ✗
teamd -d -c '{"device":"bond0","runner":{"name":"activebackup"},"ports":{"eth0":{},"eth1":{}}}'
Why it's wrong here
This command uses teamd for teaming, not bonding. The question specifically requires a bond interface using active-backup mode, so this is incorrect.
- ✓
nmcli con add type bond ifname bond0; nmcli con add type bond-slave ifname eth0 master bond0
Why this is correct
This option correctly creates the bond interface with `nmcli con add type bond ifname bond0` and adds eth0 as a slave using `type bond-slave`, which is a native nmcli connection type for bond slaves. It directly fulfills the requirement of creating a bond with a slave interface, and the mode can be set separately.
Related concept
Network Bonding
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates often confuse bonding with teaming (Option C) or resort to manual editing (Option B). Additionally, many are unaware that `type bond-slave` (Option D) is a valid native connection type in nmcli, while Option A uses an alternative syntax. In this question, the required commands are those in Option D because they directly create a bond slave.
Trap categories for this question
Command / output trap
Manual editing of configuration files is a possible method, but it is not a set of commands and is deprecated in favor of nmcli. The question asks for a set of commands, making this option incorrect.
Detailed technical explanation
How to think about this question
NetworkManager's `nmcli` creates bond interfaces using the kernel bonding driver, which supports modes like active-backup (mode 1) where only one slave is active at a time, providing failover. The `master bond0 slave-type bond` parameters in `nmcli` automatically set the `SLAVE=yes` and `MASTER=bond0` directives in the ifcfg file, ensuring the slave is recognized by the bond. In a real-world scenario, using `nmcli` ensures consistent configuration across reboots and integrates with NetworkManager's connection profiles, avoiding manual file editing that can lead to inconsistencies.
KKey Concepts to Remember
- Network Bonding
- nmcli
- bond-slave
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
Network Bonding
Real-world example
How this comes up in practice
A practitioner preparing for the EX200 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. Network Bonding 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.
Review network Bonding, then practise related EX200 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this EX200 question test?
Deploy, configure, and maintain systems — This question tests Deploy, configure, and maintain systems — Network Bonding.
What is the correct answer to this question?
The correct answer is: nmcli con add type bond ifname bond0; nmcli con add type bond-slave ifname eth0 master bond0 — Option D is correct because it uses `nmcli con add type bond ifname bond0` to create the bond interface and then `nmcli con add type bond-slave ifname eth0 master bond0` to add eth0 as a slave using the dedicated bond-slave type. While the mode (active-backup) is not specified in the commands, among the options, D is the only one that uses a direct and valid bond-slave type. Option A uses `type ethernet` with `slave-type bond`, which is also valid but less direct. Option B involves manual editing, and option C uses teamd for teaming, not bonding.
What should I do if I get this EX200 question wrong?
Review network Bonding, then practise related EX200 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Network Bonding
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Last reviewed: Jun 24, 2026
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