Question $5(2$ points$)$

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 $R2$ at time $t=0$ seconds. At time $t=55$ 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 $R1$ 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 $R1$ receive and accept a route advertisement to network $A$

from router $R3,$ after the link failure?

When router $R1$ first accepts a route advertisement to network A from router

R$3$ after the link failure, what tasks does router R$1$ perform?