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Network+ Guide to Networks
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Chapter 11 / Exercise 15
Network+ Guide to Networks
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82/ 114Reference: gurationGuide/PrivateVLANs.html 126.Which private VLAN can have only one VLAN and be a secondary VLAN that carries unidirectional traffic upstream from the hosts toward the promiscuous ports and the gateway? A. isolated VLAN B. primary VLAN C. community VLAN D. promiscuous VLAN Answer:A Explanation: Understanding Primary, Isolated, and Community Private VLANs Primary VLANs and the two types of secondary VLANs (isolated and community) have these characteristics: • Primary VLAN— The primary VLAN carries traffic from the promiscuous ports to the host ports, both isolated and community, and to other promiscuous ports. • Isolated VLAN —An isolated VLAN is a secondary VLAN that carries unidirectional traffic upstream from the hosts toward the promiscuous ports. You can configure multiple isolated VLANs in a private VLAN domain; all the traffic remains isolated within each one. Each isolated VLAN can have several isolated ports, and the traffic from each isolated port also remains completely separate. • Community VLAN—A community VLAN is a secondary VLAN that carries upstream traffic from the community ports to the promiscuous port and to other host ports in the same community. You can configure multiple community VLANs in a private VLAN domain. The ports within one community can communicate, but these ports cannot communicate with ports in any other community or isolated VLAN in the private VLAN. Reference: gurationGuide/PrivateVLANs.html 127.Which database is used to determine the validity of an ARP packet based on a valid IP-to-MAC address binding? A. DHCP snooping database B. dynamic ARP database C. dynamic routing database D. static ARP database Answer:A Explanation: Information About Dynamic ARP Inspection DAI is used to validate ARP requests and responses as follows: • Intercepts all ARP requests and responses on untrusted ports. • Verifies that a packet has a valid IP-to-MAC address binding before updating the ARP cache or forwarding the packet. • Drops invalid ARP packets.
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Chapter 11 / Exercise 15
Network+ Guide to Networks
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The safer , easier way to help you pass any IT exams.83/ 114DAI can determine the validity of an ARP packet based on valid IP-to-MAC address bindings stored in a DHCP snooping binding database. This database is built by DHCP snooping when it is enabled on the VLANs and on the device. It may also contain static entries that you have created. Reference: bleshooting/configuration/guide/n1000v_troubleshooting/n1000v_trouble_19dhcp.html

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