Question: Why do Link Layer frames not use the same checksum as IP and TCP packets. Calculate the CRC code for the following: a . G

Why do Link Layer frames not use the same checksum as IP and TCP packets.
Calculate the CRC code for the following:
a.G=100101
b.D=00101101000110100010111000000010
Assume that you have a shared network with three hosts, A, B, C, using a slotted ALOHA protocol. Write out all the possibilities for the state of a slot.
If the probability a node is transmitting is p, what is the significance of p=0 and p=1 for Slotted ALOHA and Pure ALOHA protocols?
With CSMA/CD, why does distance of nodes from each other play a role in whether collisions can occur?
PLEASE ANSWER AS MANY AS YOU CAN, DESCRIPTIVELY
Why do Link Layer frames not use the same

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