The correct answer is that the IP address 10.0.0.2 will be replaced by 10.0.0.1 after commit. This is because the output from show | compare displays the pending configuration changes staged in the candidate configuration, where the 'replace:' tag explicitly indicates that the existing address 10.0.0.2 on interface ge-0/0/0 will be removed and 10.0.0.1 added in its place, but only after a commit operation. On the JNCIA-Junos exam, interpreting pending changes from show compare is a core skill for validating configuration edits before they take effect, often tested with exhibits showing candidate versus active configurations. A common trap is assuming changes apply immediately, but Junos always requires a commit to activate the candidate configuration. Memory tip: think of 'replace:' as "remove then add"—the old value is swapped out for the new one only after you commit.
JNCIA-JUNOS Junos Configuration Basics Practice Question
This JNCIA-JUNOS practice question tests your understanding of junos configuration basics. 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.
Exhibit
user@router> show configuration | compare
[edit interfaces ge-0/0/1 unit 0 family inet]
+ address 10.0.0.1/24;
- address 10.0.0.2/24;
Refer to the exhibit. What is the effect of the pending changes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The IP address 10.0.0.2 will be replaced by 10.0.0.1 after commit.
The candidate configuration shows that the IP address 10.0.0.2 is being deleted and replaced with 10.0.0.1 on interface ge-0/0/0. In Junos, pending changes are staged in the candidate configuration and only take effect after a commit. The 'replace:' tag indicates that the existing address 10.0.0.2 will be removed and 10.0.0.1 will be added upon commit.
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.
✓
The IP address 10.0.0.2 will be replaced by 10.0.0.1 after commit.
Why this is correct
The minus and plus indicate replacement.
Related concept
Read the scenario before looking for a memorised answer.
✗
The comparison shows no changes.
Why it's wrong here
The exhibit clearly shows differences.
✗
The interface will have two IP addresses: 10.0.0.1 and 10.0.0.2.
Why it's wrong here
The minus sign indicates deletion of 10.0.0.2, so only 10.0.0.1 will remain.
✗
The candidate configuration will be empty after commit.
Why it's wrong here
The new address is present in the candidate.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may misinterpret the 'replace:' tag as an addition rather than a replacement, leading them to think both IP addresses will coexist, or they may assume no changes are shown because they overlook the 'replace:' indicator.
Trap categories for this question
Command / output trap
The exhibit clearly shows differences.
Detailed technical explanation
How to think about this question
Junos uses a two-phase commit model: changes are made to the candidate configuration and then committed to the active configuration. The 'replace:' tag in the output of 'show | compare' indicates a replacement operation, which is equivalent to deleting the old value and adding the new one in a single atomic commit. This behavior is distinct from Cisco IOS, where adding a secondary IP address without removing the primary can result in multiple addresses on the same interface.
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 JNCIA-JUNOS 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.
Junos Configuration Basics — This question tests Junos Configuration Basics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IP address 10.0.0.2 will be replaced by 10.0.0.1 after commit. — The candidate configuration shows that the IP address 10.0.0.2 is being deleted and replaced with 10.0.0.1 on interface ge-0/0/0. In Junos, pending changes are staged in the candidate configuration and only take effect after a commit. The 'replace:' tag indicates that the existing address 10.0.0.2 will be removed and 10.0.0.1 will be added upon commit.
What should I do if I get this JNCIA-JUNOS 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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