The answer is that the redistribute eigrp 100 command under EIGRP AS 200 is missing the required metric specification. When redistributing between EIGRP autonomous systems, Cisco IOS requires explicit metric values—bandwidth, delay, reliability, load, and MTU—to be included in the redistribute command, or a default-metric must be configured under the EIGRP process. Without these, the redistributed routes are silently rejected and will not appear in the topology table of the destination AS. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of EIGRP redistribution mechanics and the mandatory metric requirement, often appearing as a common trap where engineers assume redistribution between processes works like redistribution from other protocols. A reliable memory tip is the mnemonic “Big Dogs Really Love Meat” for bandwidth, delay, reliability, load, and MTU—always include them when redistributing EIGRP into EIGRP.
300-410 Route Redistribution Practice Question
This 300-410 practice question tests your understanding of route redistribution. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is troubleshooting a route redistribution issue between two EIGRP processes. Router R1 runs EIGRP AS 100 and EIGRP AS 200, and redistributes routes between them. The engineer notices that routes from EIGRP AS 100 are not appearing in the EIGRP topology table of AS 200 on R1. The redistribute eigrp 100 command is configured under EIGRP AS 200. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The redistribute eigrp 100 command under EIGRP AS 200 is missing the metric specification.
When redistributing between EIGRP processes, the redistribute command must include the metric values (bandwidth, delay, reliability, load, MTU) or a default-metric must be configured. Without a metric, the redistributed routes are not accepted.
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 redistribute eigrp 100 command under EIGRP AS 200 is missing the metric specification.
Why this is correct
Correct: Without a metric, EIGRP does not accept redistributed routes.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
EIGRP AS 100 has a higher administrative distance than EIGRP AS 200.
Why it's wrong here
Administrative distance is not relevant when redistributing between processes on the same router.
✗
The redistribute eigrp 100 command under EIGRP AS 200 is missing the subnets keyword.
Why it's wrong here
The subnets keyword is not used in EIGRP redistribution.
✗
EIGRP AS 200 has a route map that is filtering all routes.
Why it's wrong here
While possible, the missing metric is a more common and likely cause.
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
Keyword trap
The subnets keyword is not used in EIGRP redistribution.
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.
Route Redistribution — This question tests Route Redistribution — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The redistribute eigrp 100 command under EIGRP AS 200 is missing the metric specification. — When redistributing between EIGRP processes, the redistribute command must include the metric values (bandwidth, delay, reliability, load, MTU) or a default-metric must be configured. Without a metric, the redistributed routes are not accepted.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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