300-410 Route Maps and Route Filtering Practice Question
This 300-410 practice question tests your understanding of route maps and route filtering. 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.
An engineer configures a DMVPN Phase 2 network. Spoke routers are configured with a route map that sets the next-hop to the tunnel interface for routes learned from the hub. This is intended to allow spoke-to-spoke direct communication. However, spoke-to-spoke traffic still goes through the hub. Which is the most likely explanation?
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 route map is applied on the spoke router inbound from the hub, but it should be applied on the hub router outbound to the spokes.
In DMVPN Phase 2, spoke-to-spoke direct communication requires that the spoke routers have a route with the next-hop set to the tunnel interface of the remote spoke. However, if the route map is applied inbound on the spoke from the hub, it sets the next-hop to the hub's tunnel interface, not the remote spoke. The correct approach is to use a route map on the hub that sets the next-hop to the spoke's tunnel IP when advertising routes, or to use the 'next-hop-self' command incorrectly. The edge case is that the route map is applied on the spoke, not the hub.
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 route map is applied on the spoke router inbound from the hub, but it should be applied on the hub router outbound to the spokes.
Why this is correct
The hub must set the next-hop to the remote spoke's tunnel IP; the spoke cannot change the next-hop for routes received from the hub.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
The route map uses a prefix-list that does not match the spoke's subnet.
Why it's wrong here
Even if matched, the next-hop would still be the hub's tunnel IP.
✗
The spoke routers have NHRP authentication mismatch, preventing direct communication.
Why it's wrong here
NHRP authentication affects registration, not route next-hop.
✗
The tunnel mode is mGRE on the spokes, which does not support spoke-to-spoke.
Why it's wrong here
Phase 2 supports spoke-to-spoke with mGRE.
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.
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The route map is applied on the spoke router inbound from the hub, but it should be applied on the hub router outbound to the spokes. — In DMVPN Phase 2, spoke-to-spoke direct communication requires that the spoke routers have a route with the next-hop set to the tunnel interface of the remote spoke. However, if the route map is applied inbound on the spoke from the hub, it sets the next-hop to the hub's tunnel interface, not the remote spoke. The correct approach is to use a route map on the hub that sets the next-hop to the spoke's tunnel IP when advertising routes, or to use the 'next-hop-self' command incorrectly. The edge case is that the route map is applied on the spoke, not the hub.
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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