Home » Cisco » 350-080 » Which three statements about the DHCP snooping feature on Cisco Nexus switches are true?
Which three statements about the DHCP snooping feature on Cisco Nexus switches are true? (Choose three.)
A. DHCP snooping commands are not available until the feature is enabled with the feature dhcp-snooping command.
B. When you enable the DHCP snooping feature, the switch begins building and maintaining the DHCP snooping binding database.
C. The switch will not validate DHCP messages received or use the DHCP snooping binding database to validate subsequent requests from untrusted hosts until DHCP snooping is enabled globally and for each specific VLAN.
D. Globally disabling DHCP snooping removes all DHCP snooping configuration on the switch.
E. Globally disabling DHCP snooping does not remove any DHCP snooping configuration or the configuration of other features that are dependent upon the DHCP snooping feature.
Correct Answer: BCE
Explanation/Reference:
Explanation:
The DHCP snooping feature is disabled by default. When the DHCP snooping feature is disabled, you cannot configure it or any of the featuresthat depend on DHCPsnooping. The commandsto configure DHCPsnooping and its dependent features are unavailable when DHCP snooping is disabled.
When you enable the DHCPsnooping feature, the switch begins building and maintaining the DHCPsnooping binding database. Features dependent on the DHCP snooping binding database can now make use of it and can therefore also be configured.
Enabling the DHCPsnooping feature does not globally enable it. You must separately enable DHCPsnooping globally.
Disabling the DHCP snooping feature removes all DHCP snooping configuration from the switch. If you want to disable DHCP snooping and preserve the configuration, globally disable DHCP snooping but do not disable the DHCP snooping feature.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3000/sw/security/503_u3_1/b_Cisco_n3k_Security_Config_503_u3_1/b_Cisco_n3k_security_cg_503_u2_2_chapter_01010.pdf (feature enablement)