Thursday, December 05, 2013

Here's your all-new CCNA and CCNP Training Post for Thursday, December 5!

Let's get to work!

1.  By default, how many secure addresses per port does a Cisco switch allow when port security has been enabled?

2.  What is the default security mode for port security?

3.  Port security has just closed a port on your switch due to a security violation.  What exact logical state will the interface be placed into?

4.   A Cisco switch port has port security enabled.  No secure addresses have been configured.  As a result, what secure address will be used?

A.  None, since a static address must be configured for port security to function.

B.  The next dynamically learned source MAC address.

C.  The next dynamically learned destination MAC address.

D.  One of the MAC addresses that were statically assigned to the CPU at the factory (a good reason to configure a different one!)

Answers right after this brief, important break!

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And now -- the answers!

1, 2, 3:  By default, Cisco port security will assign one secure MAC address for each port-security enabled port.  

The default security mode is shutdown, and when shutdown closes a port, the port will go into err-disabled state.  

That means that once you clear up the issue that caused the port to be closed down, you have to manually close and re-open the port.  You don't have to reload the switch, but the port won't reset on its own.

4.  "B".  If you enable port security on a port and don't assign a static secure MAC address, the next source MAC address that switch sees on an incoming frame will be the secure address.

See you Saturday with another all-new practice exam!

Chris B.

Thanks for making my CCNA ICND1 Study Guide an Amazon Bestseller!

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