ICMP is Internet Control Message Protocol, a network layer protocol of the TCP/IP suite used by hosts and gateways to send notification of datagram problems back to the sender It uses the echo test / reply to test whether a destination is reachable and responding It also handles both control and error messages
Correct Answer: Object Repository means not a collection of objects it's a common repository for all the people (testing, developers) for seeing all the data in single login for example QA wants to see 5 testers works then he goes to each person login and see the data It's very difficult job for this we can use Object Repository
Correct Answer: The OSI Model is used as a reference model The primary reason the OSI model was created was so that different networks could inter-operate Hence, different networks could communicate