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Cisco Certified Network Associate (CCNA) · Cisco
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Answer B
Answer is B DETAILED STEPS Command or Action Purpose Step 1 switch# configure terminal Enters configuration mode. 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 switch(config)# mac-address-table aging-time seconds [vlan vlan_id] Step 2 seconds. Entering the value 0 disables the MAC aging. If a VLAN is not specified, the aging specification applies to all VLANs. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/layer2/503_n2_1/b_Cisco_n5k_layer2_config_gd_rel_503_N2_1/b_Cisco_n5k_layer2_config_gd_rel_503_N2_1_chapter_01111.pdf
300 secondes is correct