Cisco 300-115 Exam Question Answer

300-115 Question 19


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.


Correct Answer: A
Explanation/Reference:
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 Enters configuration mode.
terminal
Step 2 switch(config)# mac- Specifies the time before an entry ages out address-table aging- and is discarded from the MAC addr
ess table. time seconds [vlan
The range is from 0 to 1000000; the default is vlan_id] 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
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/CLIConfigurationGuide/MACAddress.html#wp1126206