hardMultiple ChoiceObjective-mapped
300-410 Practice Question: A network administrator configures an ACL to…
A network administrator configures an ACL to filter routes during redistribution, but management traffic stops working. Router R1 config:
access-list 100 permit ip 10.0.0.0 0.255.255.255 any
!
router eigrp 100
redistribute ospf 1 route-map FILTER ! route-map FILTER permit 10 match ip address 100
R1# show ip route 10.1.1.1
Routing entry for 10.1.1.1/32 Known via "connected", distance 0, metric 0 Redistributing via eigrp 100
What is the root cause?
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 ACL implicit deny blocks all routes not matching 10.0.0.0/8, including management routes.
The ACL only permits 10.0.0.0/8, but the management traffic may use a different source or destination. The implicit deny at the end of the ACL blocks all other routes, including management prefixes. The fix is to add a permit statement for the management network or use a more specific ACL.
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 ACL implicit deny blocks all routes not matching 10.0.0.0/8, including management routes.
Why this is correct
The implicit deny at the end of the ACL filters out management routes, causing them not to be redistributed.
- ✗
The route-map is missing the set metric command, causing routes to be unreachable.
Why it's wrong here
Missing set metric does not block routes; the ACL is the issue.
- ✗
The access-list is applied in the wrong direction.
Why it's wrong here
The ACL is used in a route-map, which does not have direction; it matches prefixes.
- ✗
The redistribute command is missing the subnets keyword.
Why it's wrong here
Missing subnets would affect classful behavior, but the ACL is the primary issue.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.