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Exam 300-115 All Questions

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Exam 300-115 topic 2 question 22 discussion

Actual exam question from Cisco's 300-115
Question #: 22
Topic #: 2
[All 300-115 Questions]

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
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Suggested Answer: A 🗳️
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: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/CLIConfigurationGuide/PrivateVLANs.html

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Bastex
5 years, 7 months ago
More correct citation: "Isolated VLAN —A private VLAN has only one isolated VLAN. An isolated VLAN is a secondary VLAN that carries unidirectional traffic upstream from the hosts toward the promiscuous ports and the gateway." https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9500/software/release/16-6/configuration_guide/vlan/b_166_vlan_9500_cg/b_166_vlan_9500_cg_chapter_0100.pdf
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