is a distance-vector protocol that sends the routing table every 30 seconds, uses up to 15 hops, and works best in small networks.
RIP
supports only classful routing with uniform subnet masks.
RIP v1
RIP TIMERS
Route update timer
Route invalid timer
Hold down timer
Route flush timer
Sets the interval (typically 30 seconds) between periodic routing updates in which the router sends a complete copy of its routing table out to all neighbors
ROUTE UPDATE TIMER
ROUTE INVALID TIMER
suppresses routing information for 180 seconds when a route is marked unreachable. It ends when a better metric update is received or the timer expires
HOLD DOWN TIMER
ROUTE FLUSH TIMER