Use the network shown in figure $4$ below to answer the following questions:

A$.$ PC$0$ wants to access the newly connected webserver www$.$yaya.com, explain the steps needed by PC$0,$ starting from the DNS to the TCP$/$IP protocol.

B$.$ Explain what RIP protocol is$.$ How do the routers R$0$ to R$5$ maintain their routing tables?

C$.$ Explain the difference between static, default, and dynamic routing. Highlight which routers in the network might be set to have default routing.

D$.$ Explain what is meant by "routing loops". Highlight by using an example how this can happen if network $"192\mathrm{.}168\mathrm{.}1\mathrm{.}0"$ is down.

E$.$ What are meant by "split horizon" and "holding down", and how can they be helpful to solve routing loops?

F$.$ Find the shortest path to all routers based on Dijkstra's algorithm. Show the shortest path from PC$0$ to the www$.$yaya.com webserver.