Computer Networking
A network administrator wants to upgrade the IOS of a router without removing the image currently installed. What command will display the amount of memory consumed by the current IOS image and indicate whether there is enough room available to hold both the current and new images?

show version
show flash
show buffers
show memory

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Computer Networking
Ethernet networks can be cabled in a number of topologies, depending on what works best in each environment. As more nodes are added, the efficiency of Ethernet decreases. Select the best answer as to why Ethernet becomes less efficient as size increases.

Network collisions occur
"Line echo" occurs due to the impedance of the cable
Cable terminators do not reflect the signal properly
Repeaters cannot increase the signal strength sufficiently
Cable terminators do not absorb the signal properly

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