Question 1,911 of 2,152

Route Redistribution →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the route-map’s deny sequence 20, combined with a prefix-list DENY_ALL configured to permit all (e.g., permit 0.0.0.0/0 le 32), will block all routes after sequence 10, effectively stopping redistribution. This occurs because route-map sequences are processed in order; once a route matches a deny clause, it is immediately rejected and not passed to subsequent sequences. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to troubleshoot route-map blocking redistribution by recognizing that a seemingly harmless deny entry can override earlier permit statements if the matching prefix-list is too broad. A common trap is assuming only permit sequences matter, when in fact a deny with a catch-all prefix-list silently kills redistribution. Remember the memory tip: “Deny last, check the list first”—always verify the prefix-list content behind a deny sequence to ensure it isn’t inadvertently matching everything.

300-410 Route Redistribution Practice Question

This 300-410 practice question tests your understanding of route redistribution. 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 route-map REDISTRIBUTE

route-map REDISTRIBUTE, permit, sequence 10 Match clauses:

ip address prefix-list EIGRP_ROUTES

Set clauses: metric 100 metric-type type-1 tag 200 Policy routing matches: 0 packets, 0 bytes

route-map REDISTRIBUTE, deny, sequence 20 Match clauses:

ip address prefix-list DENY_ALL

Set clauses: Policy routing matches: 0 packets, 0 bytes

Based on this output, what is the problem?

Question 1hardmultiple choice

Study the full EIGRP explanation →

A
The route-map will redistribute all routes that match prefix-list EIGRP_ROUTES with metric 100 and type-1.
Why wrong: While sequence 10 permits matching routes, sequence 20 denies all routes if DENY_ALL matches everything, so redistribution may fail.
B
The route-map has a deny sequence that may block all routes if prefix-list DENY_ALL is configured to permit all.
If DENY_ALL is a catch-all prefix-list (e.g., permit 0.0.0.0/0 le 32), then sequence 20 will deny all routes, overriding sequence 10.
C
The route-map will only redistribute routes with tag 200.
Why wrong: The tag is set, not matched; redistribution is based on match clauses, not set clauses.
D
The route-map is not applied to any redistribution command, so it has no effect.
Why wrong: The output shows the route-map is defined, but we don't know if it is applied; however, the question is about the route-map itself.

Full breakdown with real-world context →

Answer choices

Why each option matters

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 has a deny sequence that may block all routes if prefix-list DENY_ALL is configured to permit all.

The route-map has a deny sequence 20 that matches prefix-list DENY_ALL. If DENY_ALL is configured to permit all (e.g., permit 0.0.0.0/0 le 32), then all routes will be denied after sequence 10, effectively blocking redistribution. The problem is that the deny sequence may unintentionally block routes that should be redistributed.

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 will redistribute all routes that match prefix-list EIGRP_ROUTES with metric 100 and type-1.
Why it's wrong here
While sequence 10 permits matching routes, sequence 20 denies all routes if DENY_ALL matches everything, so redistribution may fail.
✓
The route-map has a deny sequence that may block all routes if prefix-list DENY_ALL is configured to permit all.
Why this is correct
If DENY_ALL is a catch-all prefix-list (e.g., permit 0.0.0.0/0 le 32), then sequence 20 will deny all routes, overriding sequence 10.
Related concept
Standard ACLs match source addresses.
✗
The route-map will only redistribute routes with tag 200.
Why it's wrong here
The tag is set, not matched; redistribution is based on match clauses, not set clauses.
✗
The route-map is not applied to any redistribution command, so it has no effect.
Why it's wrong here
The output shows the route-map is defined, but we don't know if it is applied; however, the question is about the route-map itself.

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
The output shows the route-map is defined, but we don't know if it is applied; however, the question is about the route-map itself.

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.

What to study next

Got this wrong? Here's your next step.

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.

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FAQ

Questions learners often ask

What does this 300-410 question test?

Route Redistribution — This question tests Route Redistribution — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The route-map has a deny sequence that may block all routes if prefix-list DENY_ALL is configured to permit all. — The route-map has a deny sequence 20 that matches prefix-list DENY_ALL. If DENY_ALL is configured to permit all (e.g., permit 0.0.0.0/0 le 32), then all routes will be denied after sequence 10, effectively blocking redistribution. The problem is that the deny sequence may unintentionally block routes that should be redistributed.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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