多項選擇題DHCP snooping on Cisco Nexus 1000V Series Switches acts like a firewall between untrusted hosts and trusted DHCP servers by doing which of these？ （）

A. validates DHCP messages received from untrusted sources and filters out invalid response messages from DHCP servers
B. intercepts all ARP requests and responses on untrusted ports
C. builds and maintains the DHCP snooping binding database， which contains information about untrusted hosts with leased IP addresses
D. uses the DHCP snooping binding database to validate subsequent requests from untrusted hosts
E. limits IP traffic on an interface to only those sources that have an IP-MAC address binding table entry or static IP source entry


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2.多項選擇題What are the four vPath packet flow steps？ （）

A. perform flow lookups
B. intercept packets on service enabled ports
C. run packets through the vPath flow manager
D. classify the packets
E. flow manager emits an action for the packets
F. enforce the action determined by the flow manager

4.單項選擇題When using VSD， traffic flow goes from the virtual machine to which of these？（）

A. Upstream switch
B. Virtual Supervisor Module
C. VMware distributed switch
D. VMware vSwitch
E. Service virtual machine

5.單項選擇題he Cisco Nexus 1000V Series Switches are virtual machine access switches that are an intelligent software switch implementation for VMware vSphere environments running the Cisco NX-OS Software operating system. Together with the VMware ESX hypervisor， the Nexus 1000V supports Cisco VN-Link server virtualization technology， which provides mobile virtual machine security and network policy for VMware View components， including the DHCP snooping feature. DHCP snooping is disabled on the Nexus 1000V by default. When the DHCP snooping feature is enabled on the Nexus 1000V， what are the default trust settings for the vEthernet and uplink ports？（） 

A. All vEthernet ports are trusted， and all Ethernet ports such as uplinks and port channels are trusted.
B. All vEthernet ports are not trusted， and all Ethernet ports such as uplinks and port channels are not trusted.
C. All vEthernet ports are trusted and all Ethernet ports such as uplinks and port channels are not trusted.
D. All vEthernet ports are not trusted and all Ethernet ports such as uplinks and port channels are trusted.

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