The answer is that the prefix-list MATCH_HTTP is likely misconfigured or not matching any traffic, causing the PBR route-map zero matches. This is correct because the show route-map output displays a match counter of zero packets and zero bytes, which directly indicates that the route-map’s match clause—referencing the prefix-list—is failing to classify any incoming traffic on FastEthernet0/0. In the context of the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to troubleshoot policy-based routing by interpreting show commands; a common trap is to assume the route-map is not applied to the interface, but the show ip policy output confirms it is. Instead, focus on the match clause itself: if the prefix-list does not contain the correct permit entries or uses the wrong sequence, no traffic will match. Remember the memory tip: “Zero matches? Check the matches first—prefix-list or ACL is the culprit, not the route-map application.”
300-410 Route Maps and Route Filtering Practice Question
This 300-410 practice question tests your understanding of route maps and route filtering. 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 on Router R1:
R1# show ip policy
Interface Route-map
FastEthernet0/0 PBR_MAP
R1# show route-map PBR_MAP
route-map PBR_MAP, permit, sequence 10
Match clauses:
ip address prefix-list MATCH_HTTP
Set clauses:
ip next-hop 10.10.10.2
Policy routing matches: 0 packets, 0 bytes
Based on this output, what is the most likely problem?
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 prefix-list MATCH_HTTP may not be matching any traffic, causing no policy routing.
The route-map PBR_MAP is applied to FastEthernet0/0 for policy routing, but the match counter shows 0 packets matched. This indicates that either the prefix-list MATCH_HTTP is not matching any traffic, or no traffic is hitting the interface. The correct answer is that the prefix-list may be misconfigured or not matching desired traffic.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 not being applied to any interface.
Why it's wrong here
show ip policy shows it is applied to FastEthernet0/0.
✓
The prefix-list MATCH_HTTP may not be matching any traffic, causing no policy routing.
Why this is correct
0 packets matched indicates no traffic matches the prefix-list.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The next-hop 10.10.10.2 is unreachable.
Why it's wrong here
The output does not indicate reachability; the match counter is 0.
✗
The route-map is configured with the wrong sequence number.
Why it's wrong here
Sequence 10 is valid and applied.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
show ip policy shows it is applied to FastEthernet0/0.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The prefix-list MATCH_HTTP may not be matching any traffic, causing no policy routing. — The route-map PBR_MAP is applied to FastEthernet0/0 for policy routing, but the match counter shows 0 packets matched. This indicates that either the prefix-list MATCH_HTTP is not matching any traffic, or no traffic is hitting the interface. The correct answer is that the prefix-list may be misconfigured or not matching desired traffic.
What should I do if I get this 300-410 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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