What are the major differences between a hub and a switch?
What will be an ideal response?
The major difference is that switches are intelligent. They examine each frame that they receive for the destination MAC address and then send the frame out the correct port for that address. A hub simply accepts a frame from one of its ports and then sends it out all ports. A switch also keeps a table of MAC addresses so that it knows where to send a frame. Because a switch can control where it sends a frame, devices that are connected to a switch can communicate at the same time, allowing each device to access the full network bandwidth. With a hub, only one device can transmit at a time so the bandwidth is shared among all connected devices. Also, because a switch controls the flow of frames, there is little chance of a collision. In a hub, collisions might occur frequently when under heavy use.
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The computers and software that provide e-mail services form a(n) ____.
A. e-mail system B. e-mail message C. e-mail server D. local e-mail
(Local Variable Destructors) Write a program illustrating that all destructors for objects constructed in a block are called before an exception is thrown from that block.
What will be an ideal response?
You can determine whether an object has the property,prop, using thehasOwnProperty(prop)method.
Answer the following statement true (T) or false (F)
58. A system has a memory access time of 50 ns and a cache access time of 2 ns. The instruction time is 4 ns (not counting memory access) and the average instruction requires 0.25 memory accesses. If the hit ratio is 0.90, what is the average instruction time?
What will be an ideal response?