What is the purpose of a default route?
A.
It is a route configured by an ISP that sends traffic into a corporate network.
B.
It is a route manually configured for a specific remote network for which a routing protocol is not
configured.
C.
It is used to send traffic to a stub network.
D.
It is a route to be used when the routing protocol fails.
E.
It is a route used when a packet is destined for a remote network that is not listed in the routing
table.
Explanation:
Every IP host needs to have a default route either manually configured or dynamically learned.
Default routes provide end hosts a way out of their local subnet and routers with a router of last
resort if no other route (specifically relating to the destination) exists in the routers route table.
Routers use default routing as a last resort when all other methods (directly connected, static, or
dynamic) have been exhausted. Routers inspect received datagrams to identify the logical
Network layer address of the ultimate destination. If a directly connected static or dynamic route
exists within the router’s route table, it forwards the datagram.
If the destination remains unknown, that is, no method of routing has resulted in a learned route; it
forces the router to use a default route. Typically, administrators implement default routes on
point-to-point (a link with only two routers) or dial-up connections, linking