Question 241 of 1,958
mediumMultiple ChoiceObjective-mapped
350-401 Practice Question: A router has the following configuration snippet:…
A router has the following configuration snippet:
vrf definition RED rd 100:1 !
interface Loopback0 ip vrf forwarding RED ip address 10.0.0.1 255.255.255.255
!
router eigrp 100
address-family ipv4 unicast vrf RED autonomous-system 100
network 10.0.0.1 0.0.0.0
What is the issue with this EIGRP configuration for VRF RED?
⚠ Common exam trap
Cisco often tests the default administrative shutdown of EIGRP address-families, knowing that many candidates assume the process starts automatically once the network command is configured, leading them to overlook the required 'no shutdown' command.
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 EIGRP address-family is not activated because 'no shutdown' is missing under the address-family configuration.
The EIGRP address-family configuration for VRF RED is missing the 'no shutdown' command under the address-family mode. In Cisco IOS, EIGRP address-families are administratively shut down by default; without 'no shutdown', the EIGRP process for that VRF will not form adjacencies or advertise routes, even though the network command is correctly configured.
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 EIGRP address-family is not activated because 'no shutdown' is missing under the address-family configuration.
Why this is correct
Correct. EIGRP address-families require 'no shutdown' to start.
- ✗
The 'network' command should use a wildcard mask of 0.0.0.255 instead of 0.0.0.0.
Why it's wrong here
Incorrect. A host mask is valid for a loopback interface.
- ✗
The VRF must be defined under 'router eigrp' globally before using address-family.
Why it's wrong here
Incorrect. The address-family vrf command is the correct method.
- ✗
The loopback interface cannot be placed in a VRF because it is a virtual interface.
Why it's wrong here
Incorrect. Loopback interfaces can be placed in VRFs.
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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Last reviewed: Jun 24, 2026
This 350-401 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 350-401 exam.
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