Absolute Free 4A0-112 Exam Practice for Comprehensive Preparation 

On broadcast interfaces there are different Hello packet types for level-1 and level-2 adjacencies, whereas on point-to-point interfaces there is a single Hello packet type. 

The multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces. 

The neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages. 

Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not. 

Router R1 drops the echo request because address 10.10.10.3 does not belong to an adjacent router.

Router R2 drops the echo request because it does not have subnet 10.4.100.0 in its routing table. 

Router R3 drops the echo request because it does not have subnet 10.4.100.0 in its routing table. 

The echo request arrives at the server but there is no path for the echo response to return to router R1.