The answer is that all routes with tag 50 are denied, while all other routes are permitted. This is correct because the distribute-list route-map FILTER in command applies the route-map to all incoming EIGRP updates on every interface of R6, and the route-map explicitly denies sequence 10 for any route carrying tag 50, while sequence 20 acts as an implicit permit for everything else. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of how route-map tag filtering interacts with distribute-lists to control route advertisement and installation, often appearing in scenarios where you must distinguish between filtering inbound updates versus outbound redistribution. A common trap is forgetting that without an interface specified, the distribute-list applies globally, and that a route-map ends with an implicit deny unless a permit statement is included. Memory tip: “Tag 50 gets the boot, but the rest follow suit”—the explicit deny stops only the tagged routes, while the permit at sequence 20 lets everything else through.
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.
Examine the following configuration on R6:
!--- R6 configuration
route-map FILTER deny 10
match tag 50
!
route-map FILTER permit 20
!
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
All routes with tag 50 are denied; all other routes are permitted.
The distribute-list route-map FILTER in is applied to EIGRP updates received on all interfaces (since no interface is specified). Sequence 10 denies any route with tag 50. Sequence 20 permits all other routes. Therefore, routes with tag 50 are filtered out (not installed in the routing table), while all other routes are accepted.
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.
✓
All routes with tag 50 are denied; all other routes are permitted.
Why this is correct
Correct. Sequence 10 denies routes with tag 50; sequence 20 permits everything else.
Related concept
Standard ACLs match source addresses.
✗
Routes with tag 50 are permitted; all other routes are denied.
Why it's wrong here
Incorrect. Sequence 10 denies tag 50; sequence 20 permits others.
✗
The distribute-list is applied only to the first interface; routes with tag 50 are filtered on that interface.
Why it's wrong here
Incorrect. Without an interface keyword, the distribute-list applies to all interfaces.
✗
The configuration is invalid because route-maps cannot be used with distribute-list in EIGRP.
Why it's wrong here
Incorrect. Route-maps can be used with distribute-list in EIGRP for filtering.
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
Keyword trap
Incorrect. Without an interface keyword, the distribute-list applies to all interfaces.
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: All routes with tag 50 are denied; all other routes are permitted. — The distribute-list route-map FILTER in is applied to EIGRP updates received on all interfaces (since no interface is specified). Sequence 10 denies any route with tag 50. Sequence 20 permits all other routes. Therefore, routes with tag 50 are filtered out (not installed in the routing table), while all other routes are accepted.
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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