This JNCIA-JUNOS practice question tests your understanding of user interfaces. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 | display set
set system host-name router1
set system root-authentication encrypted-password "$5$abcde$xyz..."
set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24
set system login user admin class super-user
Refer to the exhibit. Based on the output, which statement is true?
user@router> show configuration | display set
set system host-name router1
set system root-authentication encrypted-password "$5$abcde$xyz..."
set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24
set system login user admin class super-user
A
The admin user has read-only access.
Why wrong: The class is super-user, which has full access.
B
The interface ge-0/0/0 has been disabled.
Why wrong: There is no 'disable' statement for the interface.
C
The root password is stored in plaintext.
Why wrong: The password is encrypted as shown by the $5$ hash.
D
The router hostname is router1.
The 'set system host-name router1' line confirms this.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router hostname is router1.
The output shows the system prompt ending with 'router1>', which indicates the hostname is set to 'router1'. In Junos, the CLI prompt format is 'hostname>', so this directly confirms the router hostname. Option D is correct because the prompt explicitly displays 'router1' as the active hostname.
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 admin user has read-only access.
Why it's wrong here
The class is super-user, which has full access.
✗
The interface ge-0/0/0 has been disabled.
Why it's wrong here
There is no 'disable' statement for the interface.
✗
The root password is stored in plaintext.
Why it's wrong here
The password is encrypted as shown by the $5$ hash.
✓
The router hostname is router1.
Why this is correct
The 'set system host-name router1' line confirms this.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may overlook the CLI prompt as a direct indicator of the hostname and instead look for a 'show configuration' output, but Junos always displays the hostname in the prompt immediately upon login.
Trap categories for this question
Command / output trap
The password is encrypted as shown by the $5$ hash.
Detailed technical explanation
How to think about this question
The Junos CLI prompt is dynamically generated from the 'host-name' configuration statement under the 'system' hierarchy. The prompt format 'username@hostname>' (or just 'hostname>' for root) is a direct reflection of the active hostname, which is critical for identifying the device in multi-router environments. In real-world scenarios, misconfigured hostnames can cause confusion in logging, SNMP traps, and routing protocol neighbor identification.
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.
User Interfaces — This question tests User Interfaces — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The router hostname is router1. — The output shows the system prompt ending with 'router1>', which indicates the hostname is set to 'router1'. In Junos, the CLI prompt format is 'hostname>', so this directly confirms the router hostname. Option D is correct because the prompt explicitly displays 'router1' as the active hostname.
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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