In Figure Z, S1 connects to Computer A with an Ethernet Cable. In the older days, you needed to be very specific regarding the Ethernet Cable that should connect from S1 to Computer A. (Hint: We are talking about Straight through vs. Crossover Cables.) What type of cable should be used to connect S1 and A? What about the cable connecting S1 and R1? What if R1 is directly connected to Computer A (without the switch). What about two computers connecting to each other directly through an Ethernet Cable? why do we not need to worry about whether the cable is Straight through or Crossover Cable when connecting devices these days?

draw the diagram to establish a network for a computer labrotarory with 5 computers having internet facility using the following devices 1)switch2)router

The first generation of computer networks required very expensive ($1,000 or more) network adapters to connect a PC to a Network server. Below is an example; this IRMA Network adapter was used to connect a PC to an IBM mainframe server at a cost of over $1,000 and if you needed to connect to a different type of server, you had to purchase a different (and very costly interface adapter.   Today a network adapter for wired or wireless PCs are a miniature by comparison cost $30 or less and these network adapters can be used to connect to any type of hardware equipment.     Explain what changed:

In what way can we test if the rollover cable is working? Explain your answer.