- A
Step 1: Enable DHCP services. Step 2: Configure a DHCP pool with subnet and range. Step 3: Set DHCP options (gateway, DNS). Step 4: Exclude specific addresses.
This order follows the proper Junos DHCP configuration flow: first enable the service, then define the pool, then set options within the pool, and finally exclude addresses.
- B
Step 1: Configure a DHCP pool with subnet and range. Step 2: Enable DHCP services. Step 3: Set DHCP options. Step 4: Exclude specific addresses.
Why wrong: This is incorrect because you cannot configure a DHCP pool before enabling DHCP services on the router; the service must be enabled first.
- C
Step 1: Enable DHCP services. Step 2: Set DHCP options. Step 3: Configure a DHCP pool with subnet and range. Step 4: Exclude specific addresses.
Why wrong: This is incorrect because DHCP options are configured within a pool; you must define the pool before setting options.
- D
Step 1: Enable DHCP services. Step 2: Configure a DHCP pool with subnet and range. Step 3: Exclude specific addresses. Step 4: Set DHCP options.
Why wrong: This is incorrect because excluding addresses should be done after setting options; options are typically configured before exclusions for clarity.
DHCP Server Configuration on Junos
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. 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.
Arrange the steps to configure a DHCP server on a Junos router.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Step 1: Enable DHCP services. Step 2: Configure a DHCP pool with subnet and range. Step 3: Set DHCP options (gateway, DNS). Step 4: Exclude specific addresses.
The correct sequence for configuring a DHCP server on a Junos router is to first enable DHCP services, then define a pool with subnet and range, set DHCP options like gateway and DNS, and finally exclude specific addresses. This ensures all dependencies are met and the configuration is applied logically.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Step 1: Enable DHCP services. Step 2: Configure a DHCP pool with subnet and range. Step 3: Set DHCP options (gateway, DNS). Step 4: Exclude specific addresses.
- ✗
Step 1: Configure a DHCP pool with subnet and range. Step 2: Enable DHCP services. Step 3: Set DHCP options. Step 4: Exclude specific addresses.
Why it's wrong here
This is incorrect because you cannot configure a DHCP pool before enabling DHCP services on the router; the service must be enabled first.
- ✗
Step 1: Enable DHCP services. Step 2: Set DHCP options. Step 3: Configure a DHCP pool with subnet and range. Step 4: Exclude specific addresses.
Why it's wrong here
This is incorrect because DHCP options are configured within a pool; you must define the pool before setting options.
- ✗
Step 1: Enable DHCP services. Step 2: Configure a DHCP pool with subnet and range. Step 3: Exclude specific addresses. Step 4: Set DHCP options.
Why it's wrong here
This is incorrect because excluding addresses should be done after setting options; options are typically configured before exclusions for clarity.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related JNCIA-JUNOS subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this JNCIA-JUNOS question test?
Operational Monitoring and Maintenance — This question tests Operational Monitoring and Maintenance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Step 1: Enable DHCP services. Step 2: Configure a DHCP pool with subnet and range. Step 3: Set DHCP options (gateway, DNS). Step 4: Exclude specific addresses. — The correct sequence for configuring a DHCP server on a Junos router is to first enable DHCP services, then define a pool with subnet and range, set DHCP options like gateway and DNS, and finally exclude specific addresses. This ensures all dependencies are met and the configuration is applied logically.
What should I do if I get this JNCIA-JUNOS question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related JNCIA-JUNOS subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 11, 2026
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