The network is using RIPv$2$ as defined in RFC $2453.$ Assume the initial topology is stable; therefore, router R$1\text{'}$s shortest path to network A is via router R$2.$ Router R$1$ receives a full route update from R$2$ at time t $=0$ seconds. At time t $=127$ seconds, the link between router R$2$ and switch S$3$ breaks. Answer the following questions, indicating all times in seconds. You must explain how you arrived at your answers.

What will router R$2$ do immediately after detecting the link failure with switch S$3?$

At what time t $=?,$ does router R$1\text{'}$s invalid timer for the route to network A expire?

At what time t $=?,$ does router R$1$ start its garbage$-$collection timer for the route to network A$?$

During what time interval $($i$.$e$.$ provide a start time and an end time, in seconds$)$ will router R$1$ receive and accept a route advertisement to network A from router R$3,$ after the link failure?

When router R$1$ first accepts a route advertisement to network A from router R$3$ after the link failure, what tasks does router R$1$ perform?