Correct Answers:
C. Both default routes have different administrative distances.
D. The default route on port2 is marked as the standby route.
A. Incorrect: Not all routes are installed; only those marked with *.
B. Incorrect: Port2 is active but not the primary route.
C. Correct: Port1 has an administrative distance of 10, Port2 has 20.
D. Correct: Port2's route is a backup due to its higher administrative distance.
C is not true, it is false. Both entries has 1 as administrative distance. And if both are 1 they are not different!!!
A is false too.
So
Answers B&D are correct.
Administrative distance is the first number after the destination 0.0.0.0/0, which is 20 and 10.
"[20/0]
20 indicates an administrative distance of 20 out of a range of 0 to 255. 0 is an additional metric associated with this route, such as in OSPF."
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