Use the saved output, to provide a brief explanation how the routers find the proper between the autonomous systems.

What will be an ideal response?

BGP external peers exchange the routing information. Router 1 would exchange the routing
information with Router 2 and Router 3. Therefore, Router 1 would give information on the routing path to reach Router 2 to Router 3. On Router 3, BGP path information to reach Router 2 would be AS 200 from Router 2 and (AS 100, AS 200) from Router 1. Among those paths, Router 3 would select AS 200 which is direct path because it is shorter. Selected path is marked with starting “ in BGP path table.
Here is the rule for choosing the proper path:
? If the path specifies a next hop that is inaccessible, dropt the update.
? Prefer the path with the largest weight.
? If the weights are the same, prefer the path the largest local preference.
? If the local preferences are the same, prefer that the path that was originated by BGP running on this router.
? If on route was originated, prefer the route that has the shortest AS_PATH
? If all paths have the same AS_PATH length, prefer the path with the lowest origin type (whereIGP is lower than EGP and EGP is lower than incomplete)
? If the origin codes are the same, prefer the path with the lowest MED attribute.
? If the paths have the same MED, prefer the external path over the internal path.
? If the paths are still the same, prefer that path through the closest IGP neighbor
? Prefer the path with the lowest IP address, as specified by the BGP router ID.