Free Cisco SPRI 300-510 Actual Exam Questions - Question 2 Discussion
CE1 is the gateway router into the provider network via PE1. A network operator must
inject a default route into OSPF area 0. All devices inside area 0 must be able to reach PE1. Which
configuration achieves this goal?
A imo doesn’t force default route injection, so if CE1 lacks the default route, area 0 won’t learn it. D is better for guaranteed reachability.
B. Option B looks promising because it uses the default-information originate command without the always keyword, which means it will only inject the default route if CE1 actually knows it. If CE1 is acting as the gateway router to the provider network, it likely has the default route already. This avoids unnecessary route injection if the default route wasn’t present, making it a cleaner choice. D forces the default route always, but that might not be needed and could cause routing inconsistencies if the default route isn’t really there. So B seems like a solid middle ground here.
I’m going with D here. It uses default-information originate always, which forces the default route injection regardless of whether CE1 has it already—so it guarantees reachability to PE1 from all area 0 devices. Options A and B don’t explicitly handle default route origination. C might fail if the default route isn’t in CE1’s table yet, but D covers that gap by forcing it.
Option C looks right since it uses the default-information originate command properly. Option B might trick you because it redistributes static routes, but that won’t inject the default route correctly into area 0.