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DRs On LANs


The DR concept prevents overloading a subnet with too much OSPF traffic when many routers are on a subnet. Of course, lots of routers could be attached to one LAN, which is why a DR is required for routers attached to a LAN.







References

Odom, Wendell (2008) CCNA ICND2 Official Exam Certification Guide, Second Edition. Indianapolis: Cisco Press.