Part $2$ Multiple access Protocol

Define random access and list three protocols in this category.

We have a pure ALOHA network with $100$ stations. If $Tfr=1s.$ is$,$ what is the number of frames$/$s each station can send to achieve the maximum efficiency

Hint $(G=$ no$.$ of station $$ no$.$ of frames $T_{fr})$

Stations in a pure Aloha network send frames of size $1000$ bits at the rate of $1$ Mbps $.$ What is the vulnerable time for this network?

Stations in a slotted Aloha network send frames of size $1000$ bits at the rate of $1$ Mbps $.$ What is the vulnerable time for this network?

In a pure Aloha network with average number of frames generated during the transmission