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A network administrator would MOST likely use a port scanner to do which of the following?

A. Capture incoming network packets to port 80 on a workstation. B. Trace a physical network port through a building. C. Remotely test a firewall configuration on a server. D. Report the link speed and duplex of all ports on a switch

What login problems you may encounter while logging into SQL*Plus?

There are a couple of common login problems. If you enter an incorrect username or password, you will receive the following error message from Oracle server: