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350-401 Practice Question: Is configuring EIGRP on a router that connects to…
A network engineer is configuring EIGRP on a router that connects to a service provider network. The engineer wants to advertise a default route to internal routers. The engineer configures 'ip default-network 0.0.0.0' and redistributes a static default route into EIGRP. However, internal routers are not receiving the default route. The engineer checks the EIGRP topology table and sees the default route with a metric of 1. What is the most likely reason?
⚠ Common exam trap
Cisco often tests the misconception that 'ip default-network' works with EIGRP, when in fact it is an IGRP-specific command, and candidates may confuse it with the correct 'default-information originate' command used in EIGRP and OSPF.
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 static default route is not configured correctly; the engineer should use 'ip route 0.0.0.0 0.0.0.0 <next-hop>'.
The engineer's configuration includes both 'ip default-network 0.0.0.0' (which is an IGRP command, not EIGRP) and redistribution of a static default route. The appearance of the default route in the EIGRP topology table with metric 1 indicates that redistribution occurred, but the route is not being advertised to internal routers. The most likely reason is that the static default route itself is not correctly configured. For EIGRP redistribution to succeed, the static route must point to a valid next-hop IP address using the syntax 'ip route 0.0.0.0 0.0.0.0 <next-hop>'. If the engineer used an interface instead of a next-hop, or the next-hop is unreachable, the static route may be invalid or not installed in the routing table, preventing its advertisement to EIGRP neighbors.
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 engineer used 'ip default-network' which is not supported in EIGRP; instead, 'default-information originate' should be used.
Why it's wrong here
Ly states that 'default-information originate' should be used for EIGRP. That command is for OSPF, not EIGRP. While 'ip default-network' is indeed not supported in EIGRP, the correct method is to redistribute a properly configured static default route, not to use 'default-information originate'. Therefore, this is not the most likely reason.
- ✓
The static default route is not configured correctly; the engineer should use 'ip route 0.0.0.0 0.0.0.0 <next-hop>'.
Why this is correct
Correct. The static default route must be correctly configured with a next-hop IP address. If the static route is missing or uses an interface instead of a next-hop, it may not be valid, and the redistribution will not propagate the route to internal routers, despite appearing in the topology table with a metric.
- ✗
The internal routers have a route to the default network with a better metric from another source.
Why it's wrong here
Internal routers are not receiving the default route at all, so they cannot have a route with a better metric from another source. This option describes a scenario where the route is received but not preferred, which does not match the problem.
- ✗
The engineer needs to configure 'eigrp stub' on the router to allow default route advertisement.
Why it's wrong here
Configuring 'eigrp stub' on the router would restrict route advertisement, not allow it. To advertise a default route from a stub router, you would need the 'summary' keyword, but the router is not necessarily a stub. This would not be the most likely reason for the failure.
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
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