The correct interpretation is that the VRF CUSTOMER routing table contains 6 total routes, comprised of 2 connected, 1 static, and 3 EIGRP-learned routes, with no errors or inconsistencies indicated. This output from the show ip route vrf CUSTOMER summary command provides a high-level verification of the VRF routing table summary, allowing a network engineer to quickly confirm the route sources and counts without parsing individual prefixes. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to validate VRF route distribution and troubleshoot multi-protocol routing issues, often appearing in scenarios where you must distinguish between a healthy summary and one missing expected routes. A common trap is misreading the "Total" line as the number of networks rather than the sum of all routes, or overlooking that the "Subnets" column shows zero, which is normal for a classful summary. Remember the memory tip: "Total equals the sum of all route sources, not just the networks column."
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. 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 runs the following command to troubleshoot a VRF route issue:
R1# show ip route vrf CUSTOMER summary
IP routing table name is CUSTOMER (0x1)
IP routing table maximum-paths is 32
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VRF CUSTOMER routing table has 6 routes, including static and EIGRP routes.
The output shows the routing table summary for VRF CUSTOMER, with 6 total routes: 2 connected, 1 static, and 3 EIGRP routes. No red flags are present.
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 VRF CUSTOMER routing table has 6 routes, including static and EIGRP routes.
Why this is correct
The summary shows connected, static, and EIGRP routes totaling 6.
The VRF CUSTOMER routing table has an error due to overlapping subnets.
Why it's wrong here
No error is indicated in the summary.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Device Management — This question tests Device Management — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The VRF CUSTOMER routing table has 6 routes, including static and EIGRP routes. — The output shows the routing table summary for VRF CUSTOMER, with 6 total routes: 2 connected, 1 static, and 3 EIGRP routes. No red flags are present.
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.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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