Question: Question 4 : Ethernet uses Carrier Sense Multiple Access with Collision Detection ( CSMA / CD ) for its media access - control. Thus, each

Question

4

: Ethernet uses Carrier Sense Multiple Access with Collision Detection

(

CSMA

/

)

for its media access

-

control. Thus, each node listens while transmitting a frame to detect when a frame collided with another frame transmitted by another node. However, if a frame is too short, a node sometimes cannot detect a collision. a

.

What can happen when a frame is too short? b

.

Assume a signal can propagate through a copper Ethernet wire at

1.8 108

/

.

If the maximum distance between any two nodes is

900

m and you use a

10 -

Mbps Ethernet, what is the minimum frame size needed to detect collisions? c

.

If an Ethernet wire is made of a better material such that a signal can propagate through the wire at

2.5 108

/

,

what is the new minimum frame size for your network? d

.

Suppose you upgrade your network from a

10 -

Mbps Ethernet to a

100 -

Mbps Ethernet. How can you support this new

100 -

Mbps Ethernet without changing the minimum frame size or moving the nodes?

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