hardMultiple Choice
200-901 Practice Question: Based on the routing table, what type of OSPF…
Exhibit
Refer to the exhibit.
```
R1# show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.0.0.1 to network 0.0.0.0
O*E2 0.0.0.0/0 [110/1] via 10.0.0.1, 00:00:34, GigabitEthernet0/0
O 10.0.0.0/8 [110/2] via 10.0.0.1, 00:00:34, GigabitEthernet0/0
O 172.16.0.0/16 [110/3] via 192.168.1.1, 00:00:34, GigabitEthernet0/1
C 192.168.1.0/24 is directly connected, GigabitEthernet0/1
```Based on the routing table, what type of OSPF route is the default route (0.0.0.0/0)?
⚠ Common exam trap
Cisco often tests the misconception that a default route in OSPF is always an intra-area or inter-area route, when in fact it is an external route injected via redistribution or the 'default-information originate' command, and candidates confuse the route type with the LSA type.
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
✓
OSPF external type 2 route
The default route (0.0.0.0/0) in OSPF is typically redistributed from another routing protocol or statically configured and then advertised into OSPF. When a default route is injected via the 'default-information originate' command, it is advertised as an OSPF external type 2 (E2) route by default, meaning the metric does not change as it traverses OSPF areas. This matches option D.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
OSPF inter-area route
Why it's wrong here
Inter-area routes appear as O IA and represent prefixes learned from another area within the same OSPF domain; a default route injected by an ABR is marked O*IA, with the asterisk denoting the default. O IA would be correct for a specific inter-area prefix, not the 0.0.0.0/0 entry.
- ✗
OSPF NSSA external type 1 route
Why it's wrong here
NSSA external type 1 routes are denoted O N1 and originate from an ASBR redistributing into a not-so-stubby area; a default route generated by the ABR carries the O*IA designation instead. N1 would be correct for a redistributed external prefix inside an NSSA, not for the default route shown.
- ✗
OSPF intra-area route
Why it's wrong here
Intra-area routes appear as O and are learned from a router within the same area; the default route is generated by an ABR and carries the O*IA designation with the asterisk marking it as default. O would be correct for a specific prefix inside the local area, not 0.0.0.0/0.
- ✓
OSPF external type 2 route
Why this is correct
External type 2 routes carry a fixed metric that does not increment with internal hops, and the default route is redistributed into OSPF as E2. The routing table marks it O E2, matching the external type 2 classification.
Visual reference
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 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 200-901 exam.