In the context of a store$-$and$-$forward network, where communication takes place by repeatedly storing

any item to be communicated at one computer and forwarding to the next one along the route, what are

the differences in the storage requirement at each computer when:

$1.$ Complete messages or files are sent, and

$2.$ When packets are sent?

$3.$ How many routes are there from computer $1$ to computer $9?($Take a route to consist of a sequence

of computers with no repetitions.$)$

$4.$ What is the length of the shortest route and of the longest route?

$5.$ Is there a computer in this mesh that is crucial in that if it fails there is no way to 'work around' it$?$