Refer to the exhibit. 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…

Question

Exhibits

Options

• A#CE1 router ospf 1 default-information originate always
• B#CE1 ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/2 10.0.0.14 ! router ospf 1 redistribute static
• C#CE1 ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/2 10.0.0.14 ! router ospf 1 default-information originate
• D#CE1 ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/2 10.0.0.14 ! router ospf 1 redistribute static subnets

• A
  17% (7)
• B
  7% (3)
• C
  2% (1)
• D
  74% (31)

Explanation

Option D correctly uses a static default route combined with 'redistribute static subnets'. The 'subnets' keyword is critical because without it, OSPF only redistributes classful (class A/B/C) networks, and it is required to ensure all static routes, including 0.0.0.0/0, are redistributed as OSPF external routes (Type E2 by default). This makes the default route available to all devices in area 0. Option A ('default-information originate always') injects a default route unconditionally without needing a static route, but 'always' can cause routing loops if CE1 itself has no valid path to the Internet-it is generally not recommended without a valid upstream route. Option B is missing the 'subnets' keyword, which would prevent the 0.0.0.0/0 route from being redistributed. Option C uses 'default-information originate' (without 'always'), which requires a default route to already exist in the routing table-this could work, but redistributing the static route via Option D is the more explicit and reliable approach when a static route is already configured.

No community discussion yet for this question.