mediumMultiple Choice
300-410 Practice Question: Examine this partial configuration on Router R3:…
Examine this partial configuration on Router R3:
router ospf 1
redistribute rip subnets metric-type 1 metric 50
What is the effect of the 'metric-type 1' keyword?
⚠ Common exam trap
300-410 often tests whether candidates remember that E2 is the default and E1 adds internal cost — the trap is assuming 'metric-type 1' behaves like the default E2 or that it is overridden by the 'metric' keyword.
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
✓
Redistributed RIP routes become OSPF Type 1 external LSAs, and the metric is the sum of the external metric (50) plus the internal OSPF cost to the ASBR.
The 'metric-type 1' keyword makes redistributed routes OSPF E1 (Type 1 external) LSAs, whose cost is the external metric (50) plus the cumulative internal OSPF cost from the receiving router to the ASBR. This makes the path cost topology-aware, so routers closer to the ASBR prefer the route.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Redistributed RIP routes become OSPF Type 1 external LSAs, and the metric is the sum of the external metric (50) plus the internal OSPF cost to the ASBR.
Why this is correct
Metric-type 1 generates E1 LSAs, where the advertised metric equals the external cost (50) plus the cumulative internal OSPF cost from the receiving router to the ASBR. This satisfies the stem's requirement by making path selection reflect total cost to the destination, unlike E2, which ignores internal cost.
- ✗
Redistributed RIP routes become OSPF Type 2 external LSAs with a fixed metric of 50.
Why it's wrong here
The metric-type 1 keyword generates Type 1 external LSAs, whose metric is the seed plus accumulated internal OSPF cost, not Type 2. Type 2 is tempting because it is the default external type, but the keyword explicitly overrides that default here.
- ✗
The 'metric-type 1' is ignored because the 'metric' keyword is also used.
Why it's wrong here
The metric and metric-type keywords are independent: metric sets the seed value, metric-type sets the external LSA type. It is tempting to assume they conflict, but OSPF accepts both together, producing Type 1 externals with a seed metric of 50.
- ✗
The redistributed routes will have a metric of 50 and will not be affected by internal OSPF cost.
Why it's wrong here
Type 1 external metrics are the sum of the seed metric and internal OSPF costs along the path, so they are affected by internal cost. The fixed-metric behaviour described belongs to Type 2 externals, which is why that reading tempts, but the keyword selects Type 1.
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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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