CCNA 3 – Chapter 10: OSPF Tuning and TroubleshootingOSPF Network types:oPoint-to-pointoBroadcast multiaccessoNonbroadcast multiaccess (NBMA)oPoint-to-multipointoVirtual linksMultiaccess networks create two challenges regarding the flooding of OSPF LSAs.oCreation of multiple adjacenciesoExtensive flooding of LSAsOn multiaccess networks, OSPF elects a DR to be the collection and distribution point for LSAs sent and received.oA BDR is also elected for when the DR fails.oAll non-DR and BDR routers become DROTHER and only form fulladjacencies with the DR and BDR in the network.DR is the router with the highest router IDBDR is the router with the 2nd highest router IDElection of DR/BDRo1. Highest interface priority 0-255, default priority is 1. o2. Router IDo3. Highest loopback IP numbero4. Highest interface IP numberoIf the interface priority is set to 0, it will not be part of the election at all.