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 Consider the following two networks  Network 1 : (Ethernet LAN) (i) Transmission speed is 10 Mbps (ii) Signal travelling speed 2/3 of velocity of light (iii) Length of cable = 3 km Network 2 : (CSMA / CD Network) (i) Transmission speed is 200 Mbps (ii) Signal travelling speed 1/3 of velocity of light (iii) Length of cable = 6 km The minimum frame size required for network is x bits and for Network 2 is y bits. So what is value of x + y = ______.

15000

In Ethernet the Transmission Time should be greater than equal to twice that of the propagation time.(Ethernet uses CSMA/CD).

For network 1: L(length of the data)=x bits                                          For network 2:L(length of the data)=y bits

Bandwidth=10Mbps                                                                             Bandwidth=200Mbps

distance i.e d=3 km                                                                               distance i.e d=6 km

v=2/3 * velocity of light                                                                          v=1/3*velocity of light

L/B>=2*d/v

so putting these values in the above equation we obtain x=300 bits and y=24000bits

So the answer i.e. x+y=24000+300=24300 bits.