The correct command is `delete interfaces ge-0/0/1 unit 0 family inet address 10.0.0.2/24`, because Junos organizes IP addresses hierarchically under the `family inet address` stanza, allowing you to remove a single address entry without disturbing other addresses, VLAN tags, or protocol families on the same logical unit. This tests your understanding of Junos configuration hierarchy and the precision of the `delete` command—a key skill for the JNCIA-Junos exam, where questions often present a candidate configuration and ask which command removes only a specific element. A common trap is using `delete interfaces ge-0/0/1 unit 0` or `delete interfaces ge-0/0/1`, which would wipe the entire unit or interface, respectively. Remember: to surgically remove one IP, you must walk the full path down to the exact address—think of it as “delete the leaf, not the branch.”
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.
user@router> show configuration interfaces ge-0/0/1
unit 0 {
family inet {
address 10.0.0.1/24;
address 10.0.0.2/24;
}
}
unit 1 {
family inet {
address 10.0.1.1/24;
}
}
user@router> show configuration 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. An administrator wants to remove the address 10.0.0.2/24 from unit 0. Which configuration mode command achieves this without affecting other configuration?
Refer to the exhibit.
user@router> show configuration interfaces ge-0/0/1
unit 0 {
family inet {
address 10.0.0.1/24;
address 10.0.0.2/24;
}
}
unit 1 {
family inet {
address 10.0.1.1/24;
}
}
user@router> show configuration interfaces ge-0/0/1 unit 0
family inet {
address 10.0.0.1/24;
address 10.0.0.2/24;
}
A
delete interfaces ge-0/0/1 unit 0
Why wrong: Deletes the entire unit 0, including both addresses.
B
delete interfaces ge-0/0/1 unit 0 family inet address
Why wrong: Removes all addresses under unit 0.
C
delete interfaces ge-0/0/1 unit 0 family inet address 10.0.0.2/24
Removes only the specified address.
D
delete interfaces ge-0/0/1 unit 1 family inet address 10.0.0.2/24
Why wrong: Wrong unit; unit 1 has a different address.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
delete interfaces ge-0/0/1 unit 0 family inet address 10.0.0.2/24
Option C is correct because the command `delete interfaces ge-0/0/1 unit 0 family inet address 10.0.0.2/24` specifically removes only the IPv4 address 10.0.0.2/24 from the logical unit 0, leaving all other configuration (such as other addresses, VLAN tagging, or protocol families) intact. In Junos, addresses are hierarchical under `family inet address`, and deleting a specific address entry does not affect sibling addresses or the unit itself.
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.
✗
delete interfaces ge-0/0/1 unit 0
Why it's wrong here
Deletes the entire unit 0, including both addresses.
✗
delete interfaces ge-0/0/1 unit 0 family inet address
Why it's wrong here
Removes all addresses under unit 0.
✓
delete interfaces ge-0/0/1 unit 0 family inet address 10.0.0.2/24
Why this is correct
Removes only the specified address.
Related concept
Read the scenario before looking for a memorised answer.
✗
delete interfaces ge-0/0/1 unit 1 family inet address 10.0.0.2/24
Why it's wrong here
Wrong unit; unit 1 has a different address.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse deleting the entire unit or address family with deleting a single address, leading them to choose options that remove more configuration than intended, which is a common mistake in Junos hierarchical configuration management.
Detailed technical explanation
How to think about this question
Under the hood, Junos stores interface addresses as a list under the `address` hierarchy; deleting a specific address entry uses the exact prefix length to match the configuration node. This granularity is essential when multiple addresses are configured on the same logical unit (e.g., for virtual IPs or multi-homing), as a broader delete would remove all addresses and potentially break routing or services relying on them. In real-world scenarios, this precision prevents accidental service disruption when managing IP addresses on a production 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 help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
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: delete interfaces ge-0/0/1 unit 0 family inet address 10.0.0.2/24 — Option C is correct because the command `delete interfaces ge-0/0/1 unit 0 family inet address 10.0.0.2/24` specifically removes only the IPv4 address 10.0.0.2/24 from the logical unit 0, leaving all other configuration (such as other addresses, VLAN tagging, or protocol families) intact. In Junos, addresses are hierarchical under `family inet address`, and deleting a specific address entry does not affect sibling addresses or the unit itself.
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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