An engineer must configure OSPF in the data center.
The external routes have already been redistributed into OSPF.
The network most meets these criteria: * The data center servers must reach services in the cloud and the services behind the redistributed routes.
* The exit point toward the Internet should be propagated only when there is a dynamically learned default route from the upstream router.
Which feature is required?
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A. B. C. D.C.
The requirement in this scenario is to ensure that data center servers can access services in the cloud and also reach services behind the redistributed routes, while also ensuring that the default route towards the Internet is propagated only when a dynamically learned default route from the upstream router is available.
To achieve this, the OSPF protocol can be used in the data center. OSPF is a link-state routing protocol that uses various types of areas to support hierarchical network design and efficient routing. The different types of OSPF areas include standard areas, stub areas, totally stubby areas, and not-so-stubby areas (NSSAs).
Out of the given options, the best solution for this scenario is option C: default-information originate.
The 'default-information originate' command is used to generate a default route in OSPF. It generates a default route into the OSPF domain and advertises it to all OSPF routers in the domain. This means that any router that needs to send traffic to a destination outside the OSPF domain will use the default route as the next hop.
In this scenario, when a dynamically learned default route from the upstream router is available, the 'default-information originate' command will advertise the default route to all OSPF routers in the domain, allowing them to reach destinations outside the domain via the upstream router. However, if a dynamically learned default route is not available, the default route will not be advertised, which meets the requirement of only propagating the default route when it is needed.
Option A, 'stubby area', is not the best solution because it limits the propagation of external routes and can cause issues in reaching services behind the redistributed routes.
Option B, 'totally stubby area', is not the best solution because it suppresses all external routes, including the default route, which does not meet the requirement of propagating the default route when it is needed.
Option D, 'default-information originate always', is not the best solution because it will advertise the default route to all OSPF routers in the domain regardless of whether a dynamically learned default route is available or not, which does not meet the requirement of only propagating the default route when it is needed.