This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). 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.
A network engineer runs the following command to verify DHCPv4 pool configuration on router R1:
R1# show ip dhcp pool DHCP_POOL
Output:
Pool DHCP_POOL :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 254
Leased addresses : 100
Pending event : none
1 subnet is currently in the pool :
Current index IP address range Leased addresses
192.168.1.1 192.168.1.1 - 192.168.1.254 100
What does this output indicate?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The DHCP pool has 254 addresses available, and 100 are currently leased.
The show ip dhcp pool command displays pool details. This pool has 254 total addresses, with 100 currently leased. The current index shows the next address to be assigned (192.168.1.1, but this is the start of the range; the actual next assignment may be tracked differently).
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.
✓
The DHCP pool has 254 addresses available, and 100 are currently leased.
Why this is correct
Total addresses is 254, leased addresses is 100, so 154 are available.
Clue confirmation
The clue word "first" in the question point toward this answer.
The DHCP pool is exhausted because 100 addresses are leased.
Why it's wrong here
100 out of 254 are leased, so the pool is not exhausted.
✗
The DHCP server is using a database agent to store leases.
Why it's wrong here
No database agent information is shown in this output.
✗
The DHCP pool has a utilization mark of 100%, meaning it is full.
Why it's wrong here
The utilization mark is a threshold for logging, not current utilization.
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.
Trap categories for this question
Command / output trap
No database agent information is shown in this output.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 300-410 subnetting questions on CIDR, address ranges, and subnet selection.
DHCP (IPv4 and IPv6) — This question tests DHCP (IPv4 and IPv6) — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The DHCP pool has 254 addresses available, and 100 are currently leased. — The show ip dhcp pool command displays pool details. This pool has 254 total addresses, with 100 currently leased. The current index shows the next address to be assigned (192.168.1.1, but this is the start of the range; the actual next assignment may be tracked differently).
What should I do if I get this 300-410 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 300-410 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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