What are two reasons why a route might be hidden? (Choose two.)
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A. B. C. D.CD
A route in a routing table might be hidden or not visible for different reasons. Here are the two reasons why a route might be hidden:
Invalid next hop: A route might be hidden if there is no valid next hop address to reach that destination network. The next hop is the IP address of the next router in the path to the destination network. If the router cannot find a valid next hop address for a route, it will not install the route in its routing table. This can happen if the next hop is not reachable or if the interface leading to the next hop is down.
Routing policy: A route might be hidden if it does not match the routing policy configured on the router. Routing policy is a set of rules that determine how routes are selected, modified, or discarded based on specific criteria. If a route does not match the routing policy, it will not be installed in the routing table. For example, a routing policy might be configured to block routes from a specific network or to prefer routes from a particular provider.
In contrast, route preference and routing loops are not reasons for a route to be hidden in the routing table. Route preference determines the priority or importance of routes, with lower values being preferred over higher ones. Routing loops occur when packets are forwarded in a loop between routers due to incorrect routing information, leading to network congestion and instability. However, neither of these factors directly affect whether a route is visible in the routing table.