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A is Correct. AD is used to break tie between multiple routing protocols. Metric is used to break tie between two routes learned via the same protocol.
This is a tricky question. If the Admin Distrances aren't equal then only one route would be in the routing table at a time. If Admin Distances have been altered to have match, that would mean the metrics would take priority.
Answer is A: Administrative distance
The reason it is not B: Metric, is because the question already mentions that the routes all use different routing protocols, therefore we know all the routes will have a different AD. If the question said all the routes use the same protocol, then Metric would be the correct answer.
Set Administrative Distances for types of routes as required for your network. When the virtual router has two or more different routes to the same destination, it uses administrative distance to choose the best path from different routing protocols and static routes, by preferring a lower distance.
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/networking/virtual-routers
Clear as day in this link.
Search "Metric".
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-web-interface-help/network/network-virtual-routers/more-runtime-stats-for-a-virtual-router/routing-tab
Wrong:
"Set Administrative Distances for types of routes as required for your network. When the virtual router has two or more different routes to the same destination, it uses administrative distance to choose the best path from different routing protocols and static routes, by preferring a lower distance."
A is correct. See cisco definitions below
Administrative distance- This is the measure of trustworthiness of the source of the route. If a router learns about a destination from more than one routing protocol, the administrative distance is compared and the preference is given to the routes with lower administrative distance.
Metrics- This is a measure used by the routing protocol to calculate the best path to a given destination, if it learns multiple paths to the same destination. Each routing protocol uses a different metric.
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