What effect does the mac address-table aging-time 180 command have on the MAC address- table?

A.
This is how long a dynamic MAC address will remain in the CAM table.

B.
The MAC address-table will be flushed every 3 minutes.

C.
The default timeout period will be 360 seconds.

D.
ARP requests will be processed less frequently by the switch.

E.
The MAC address-table will hold addresses 180 seconds longer than the default of 10 minutes.

Explanation:
You can configure the amount of time that an entry (the packet source MAC address and port that packet ingresses) remain in the MAC table.
To configure the aging time for all MAC addresses, perform this task:
Command
Purpose
Step 1
switch# configure terminal
Enters configuration mode.

Step 2
switch(config)# mac-address-table aging-time seconds [vlan vlan_id] Specifies the time before an entry ages out and is discarded from the MAC address table. The
range is from 0 to 1000000; the default is 300 seconds. Entering the value 0 disables the MAC aging. If a VLAN is not specified, the aging specification applies to all
VLANs.

This example shows how to set the aging time for entries in the MAC address table to 600 seconds (10 minutes):
switch# configure terminal
switch(config)# mac-address-table aging-time 600

http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/C LIConfigurationGuide/MACAddress.html#wp1126206