You have been given the network of 141.23.64.0/19. What is a valid host in this network?

Assume a router using RIP has 12 entries in its forwarding table at time t. The 12 entries received the last update 68, 123, 140, 198, 202, 130, 150, 178, 70, 183, 34 and 213 seconds before time t2 respectively. Find the number of periodic timers, expiration timers, and garbage collection timers running at time ty and t2