Which router is elected as the PIM DR?

In a PIM (Protocol Independent Multicast) network, the Designated Router (DR) is selected to reduce the amount of multicast traffic on the network and to manage multicast data distribution effectively. The election process for the PIM DR primarily depends on the IP addresses of the routers participating in the multicast group.

The correct approach is to elect the router with the highest IP address among the candidates configuring PIM on that network segment. This criterion ensures that if a router with a higher IP address is present, it is given preference, which helps in maintaining a consistent DR in a typically dynamic environment. The router with the highest IP address is selected as it is considered to have more authority in the network topology for multicast traffic distribution.

In contrast, options referring to the lowest IP address, highest capabilities, or greatest bandwidth do not follow the established election rules of PIM. The election process is straightforward and relies solely on the IP addresses rather than performance metrics or capabilities, making the selection process efficient and less prone to fluctuations due to bandwidth changes.