The same route appears in the routing table three times using three different protocols.
Which mechanism determines how the firewall chooses which route to use?
The same route appears in the routing table three times using three different protocols.
Which mechanism determines how the firewall chooses which route to use?
Administrative distance is the mechanism used to determine how a firewall chooses which route to use when the same route appears in the routing table multiple times using different protocols. It is a value that represents the trustworthiness of a route, with lower values being more trusted. This helps the firewall prioritize which route to use when multiple routes to the same destination are available from different protocols.
The options A seems to be correct, check below link https://live.paloaltonetworks.com/t5/general-topics/route-selection-algorithm/td-p/399863
Agree https://live.paloaltonetworks.com/t5/general-topics/route-amp-path-selection/td-p/222268
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."
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.
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.
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
metric is correct B
Wrong. Read the question again
If the routes have differents AD, they shouldn't be in route table in the same time. In this case, B seems more corret to me.
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.
A. Question says same route with 3 different protocols. https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/networking/virtual-routers
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.
A is correct. Note the question says the routes are of different protocols....
AD is to select a route reported by multiple protocols Metric is when the same protocol reports a route via two different paths (metrics/costs).