The correct answer is that only the address 192.168.1.1/24 will be removed, leaving 192.168.1.2/24 intact. This happens because the delete command in Junos operates hierarchically, targeting the exact configuration path specified; by appending the specific address to the command, you isolate that leaf node for removal without affecting sibling statements under the same hierarchy level. On the JNCIA-Junos exam, this tests your understanding of Junos’s hierarchical configuration model and the precision of the delete operation—a common trap is assuming that deleting an address statement removes all addresses under that family. Remember the memory tip: “Delete drills down, not across”—it only removes the exact leaf you point to, leaving all other siblings untouched.
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
Refer to the exhibit.
[edit]
user@router# set interfaces ge-0/0/0 unit 0 family inet address 192.168.1.1/24
user@router# set interfaces ge-0/0/0 unit 0 family inet address 192.168.1.2/24
user@router# show interfaces ge-0/0/0
unit 0 {
family inet {
address 192.168.1.1/24;
address 192.168.1.2/24;
}
}
Refer to the exhibit. If the administrator now enters the command 'delete interfaces ge-0/0/0 unit 0 family inet address 192.168.1.1/24' and then commits, what will be the result?
Refer to the exhibit.
[edit]
user@router# set interfaces ge-0/0/0 unit 0 family inet address 192.168.1.1/24
user@router# set interfaces ge-0/0/0 unit 0 family inet address 192.168.1.2/24
user@router# show interfaces ge-0/0/0
unit 0 {
family inet {
address 192.168.1.1/24;
address 192.168.1.2/24;
}
}
A
Only the address 192.168.1.1/24 will be removed, and 192.168.1.2/24 will remain.
Exact deletion of the specified address.
B
The commit will fail due to an attempt to delete a non-existent address.
Why wrong: The address exists, so deletion is valid.
C
The entire unit 0 will be deleted.
Why wrong: Only the specified address is deleted, not the whole unit.
D
Both addresses will be removed from the configuration.
Why wrong: Only the explicitly deleted address is removed.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Only the address 192.168.1.1/24 will be removed, and 192.168.1.2/24 will remain.
The 'delete' command in Junos is hierarchical and targets the exact configuration hierarchy specified. In this case, the command specifies 'address 192.168.1.1/24' under 'family inet', so only that specific address is removed. The other address (192.168.1.2/24) remains because it is a separate leaf under the same 'address' statement and is not affected by the deletion.
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.
✓
Only the address 192.168.1.1/24 will be removed, and 192.168.1.2/24 will remain.
Why this is correct
Exact deletion of the specified address.
Related concept
Read the scenario before looking for a memorised answer.
✗
The commit will fail due to an attempt to delete a non-existent address.
Why it's wrong here
The address exists, so deletion is valid.
✗
The entire unit 0 will be deleted.
Why it's wrong here
Only the specified address is deleted, not the whole unit.
✗
Both addresses will be removed from the configuration.
Why it's wrong here
Only the explicitly deleted address is removed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume deleting one address under a 'family inet' block will remove all addresses, similar to how some other platforms (e.g., Cisco IOS) treat the 'ip address' command as replacing the entire address list, but Junos treats each address as an independent leaf.
Detailed technical explanation
How to think about this question
Junos configuration is stored as a hierarchical data structure (similar to an XML tree). The 'delete' command operates on a specific node; if the node is a leaf (like an IP address), only that leaf is removed. This is different from some other vendors where deleting an address might remove all addresses under a subnet or interface. In real-world scenarios, this granularity allows administrators to add or remove individual IP addresses on an interface without affecting other services (e.g., keeping a management IP while removing a deprecated subnet).
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: Only the address 192.168.1.1/24 will be removed, and 192.168.1.2/24 will remain. — The 'delete' command in Junos is hierarchical and targets the exact configuration hierarchy specified. In this case, the command specifies 'address 192.168.1.1/24' under 'family inet', so only that specific address is removed. The other address (192.168.1.2/24) remains because it is a separate leaf under the same 'address' statement and is not affected by the deletion.
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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