1. What two types of ICMP messages are received at the sending host executing the traceroute program? 2. True or false: When an OSPF route sends its link state information, it is sent only to those nodes directly attached neighbors. Explain. 1. What two types of ICMP messages are received at the sending host executing the traceroute program? 2. True or false: When an OSPF route sends its link state information, it is sent only to those nodes directly attached neighbors. Explain. 2. True or false: When an OSPF route sends its link state information, it is sent only to those nodes directly attached neighbors. Explain. Solution (1).The two types of messages are received at the srending host executing the traceroute programm is as follows: 1.Port unreachable 2.Time exceeded i.e TTL=0 (2).Answer:True Reason:it utilizes the IP multicast to send link state updates .it confirms little processing on routers which are not concentrating on OSF packets..