Quick Answer
The answer is the `set interfaces ge-0/0/0 unit 0 family inet dhcp` hierarchy. This is correct because Junos separates IPv4 and IPv6 configuration at the logical unit level, so DHCP client functionality for obtaining an IPv4 address must be placed under the `family inet` stanza, not directly under the interface or unit. On the JNCIA-Junos exam, this tests your understanding of the Junos configuration hierarchy and the distinction between physical and logical interfaces; a common trap is trying to apply DHCP under `family inet6` or at the `unit` level without specifying the address family. Remember that `family inet` is the home for all IPv4 address acquisition methods, including static, DHCP, and PPPoE. A helpful memory tip: think "inet for IP" — if you need an IPv4 address from a server, always nest your DHCP command under `family inet`.
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.
A network engineer needs to configure an interface on a Juniper device to use DHCP to obtain an IP address. Which hierarchy is used to apply this configuration?
set interfaces ge-0/0/0 unit 0 family inet dhcp
Correctly enables DHCP client on the specified interface.
set interfaces ge-0/0/0 dhcp-client
Why wrong: Incorrect syntax; DHCP is configured under the address family.
set interfaces ge-0/0/0 unit 0 family inet6 dhcp
Why wrong: This is for IPv6 DHCP, not IPv4.
set interfaces ge-0/0/0 unit 0 family ppp dhcp
Why wrong: PPP family does not use DHCP.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
set interfaces ge-0/0/0 unit 0 family inet dhcp
Option A is correct because on Juniper devices, DHCP client functionality for IPv4 is configured under the `family inet` hierarchy within a logical interface unit. The command `set interfaces ge-0/0/0 unit 0 family inet dhcp` enables the interface to obtain an IPv4 address via DHCP, which is the standard method for dynamic address assignment on Ethernet interfaces.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
set interfaces ge-0/0/0 unit 0 family inet dhcp
Why this is correct
Correctly enables DHCP client on the specified interface.
Related concept
Read the scenario before looking for a memorised answer.
set interfaces ge-0/0/0 dhcp-client
Why it's wrong here
Incorrect syntax; DHCP is configured under the address family.
set interfaces ge-0/0/0 unit 0 family inet6 dhcp
Why it's wrong here
This is for IPv6 DHCP, not IPv4.
set interfaces ge-0/0/0 unit 0 family ppp dhcp
Why it's wrong here
PPP family does not use DHCP.
Common exam traps
The trap here is that Cisco engineers often expect DHCP client configuration to be applied directly under the physical interface (like `ip address dhcp` on Cisco IOS), but Junos requires it under the logical unit and address family hierarchy, leading candidates to choose option B.
Detailed technical explanation
Under the hood, Junos implements DHCP client functionality using the `dhcp` statement under `family inet`, which triggers the Junos DHCP client process to send DHCPDISCOVER messages and negotiate an IPv4 lease. This configuration also allows optional parameters like `client-identifier`, `lease-time`, and `vendor-id` to be set. In real-world scenarios, this is commonly used on management interfaces or WAN-facing interfaces where dynamic addressing is required, and the configuration must be applied at the unit level to support multiple logical interfaces on a single physical port.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Junos Configuration Basics — study guide chapter
Learn the concepts, then practise the questions
Junos Configuration Basics practice questions
Targeted practice on this topic area only
All JNCIA-JUNOS questions
514 questions across all exam domains
Juniper Networks Certified Associate Junos JNCIA-Junos study guide
Full concept coverage aligned to exam objectives
JNCIA-JUNOS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise JNCIA-JUNOS questions linked to User Interfaces.
Practise JNCIA-JUNOS questions linked to Junos Configuration Basics.
Practise JNCIA-JUNOS questions linked to Operational Monitoring and Maintenance.
Practise JNCIA-JUNOS questions linked to Routing Fundamentals.
Practise JNCIA-JUNOS questions linked to Networking Fundamentals.
Practise JNCIA-JUNOS questions linked to Junos OS Fundamentals.
Practise JNCIA-JUNOS questions linked to JNCIA-JUNOS fundamentals.
Practise JNCIA-JUNOS questions linked to JNCIA-JUNOS scenario.
Practise JNCIA-JUNOS questions linked to JNCIA-JUNOS troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Junos Configuration Basics — This question tests Junos Configuration Basics — Read the scenario before looking for a memorised answer..
The correct answer is: set interfaces ge-0/0/0 unit 0 family inet dhcp — Option A is correct because on Juniper devices, DHCP client functionality for IPv4 is configured under the `family inet` hierarchy within a logical interface unit. The command `set interfaces ge-0/0/0 unit 0 family inet dhcp` enables the interface to obtain an IPv4 address via DHCP, which is the standard method for dynamic address assignment on Ethernet interfaces.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This JNCIA-JUNOS practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIA-JUNOS exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.