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What is the main purpose of private VLANs (PVLANs) in networking?
a. To provide layer 3 routing between VLANs
b. To provide layer 2 security and isolation within a VLAN
c. To increase broadcast domains across a switch
d. To allow multicast transmission between VLANs
Answer: bgeeksforgeeks+2
Which of the following best defines a primary VLAN in the context of PVLANs?
a. VLAN that segments layer 3 traffic
b. Main VLAN associated with one or more secondary VLANs
c. VLAN used exclusively for management interfaces
d. VLAN that provides internet access
Answer: bwikipedia+2
What is an isolated VLAN in PVLANs?
a. Allows communication between all ports in the VLAN
b. Prevents any communication between ports except with promiscuous ports
c. Allows only multicast traffic
d. Segregates only management traffic
Answer: bnotes.networklessons+2
Which port type in PVLANs can communicate with all other ports?
a. Community port
b. Isolated port
c. Promiscuous port
d. Trunk port
Answer: cgeeksforgeeks+2
In a community VLAN, hosts can communicate with:
a. Only isolated VLANs
b. Community VLAN members and promiscuous ports
c. Isolated VLANs and all other VLANs
d. Only the router
Answer: bwikipedia+2
What is the primary benefit of using PVLANs in data centers?
a. Increased internet speed
b. Enhanced host isolation within the same subnet
c. Automatic switching
d. Wireless networking
Answer: bnetseccloud+2
Which configuration allows limited access between devices in the same broadcast domain?
a. Regular VLAN
b. Private VLAN
c. Trunk VLAN
d. Guest VLAN
Answer: bnetseccloud+2
Which type of VLAN under PVLANs is designed to restrict hosts from talking to each other?
a. Promiscuous VLAN
b. Isolated VLAN
c. Community VLAN
d. Secondary VLAN
Answer: bnotes.networklessons+2
What type of port is assigned to the gateway of PVLANs?
a. Access port
b. Community port
c. Promiscuous port
d. Isolated port
Answer: cgeeksforgeeks+2
Which statement is true about community VLANs?
a. Community VLANs can communicate with all other secondary VLANs
b. Community VLANs only allow communication with members of the same community VLAN and promiscuous ports
c. Community VLANs provide unrestricted access
d. Community VLANs cannot share broadcast domains
Answer: bwikipedia+2
Which type of port can only send traffic to promiscuous ports in a PVLAN setup?
a. Access port
b. Trunk port
c. Isolated port
d. Community port
Answer: cnotes.networklessons+2
PVLANs split a traditional broadcast domain into:
a. Only isolated domains
b. Multiple smaller broadcast subdomains
c. Layer 3 routing subnets
d. Trunk link domains
Answer: bwikipedia+1
What is required for hosts in different community VLANs to communicate?
a. Promiscuous port connecting gateways
b. Trunk port configuration
c. Direct L2 communication
d. None, they can communicate by default
Answer: anetseccloud+2
Which is a use case for PVLANs in hotel networks?
a. Allowing each room to be in a separate IP subnet
b. Allowing per-room network access without separate IP subnets
c. Creating wireless mesh networks
d. Enabling guest VLAN
Answer: bjuniper+2
Which statement is incorrect about isolated VLANs?
a. Devices can only communicate with promiscuous ports
b. Devices can communicate with each other
c. Isolation happens at Layer 2
d. Used to separate clients in hosting environments
Answer: bgeeksforgeeks+2
In a PVLAN, which type of VLAN passes frames to all secondary VLANs?
a. Community VLAN
b. Isolated VLAN
c. Primary VLAN
d. Promiscuous VLAN
Answer: cnotes.networklessons+2
Which action cannot be performed by isolated ports?
a. Send data to promiscuous port
b. Communicate with devices in the same isolated VLAN
c. Transmit unicast traffic
d. Receive traffic from primary VLAN
Answer: bwikipedia+1
What must be disabled for PVLANs to work correctly in Cisco switches?
a. Spanning Tree Protocol
b. VLAN Trunking Protocol (VTP)
c. Quality of Service (QoS)
d. Access Control Lists
Answer: bbrainscape
Which port type can be assigned to a firewall or router in PVLANs?
a. Access port
b. Promiscuous port
c. Community port
d. Isolated port
Answer: bgeeksforgeeks+2
Secondary VLANs in PVLAN can be of which type(s)?
a. Community VLAN only
b. Isolated VLAN only
c. Both Isolated and Community VLANs
d. Trunk VLANs
Answer: cnotes.networklessons+2
Which is not an advantage of PVLANs?
a. More granular segmentation
b. Reduced VLAN count
c. Loss of isolation
d. Enhanced security
Answer: cnetseccloud+2
The term “promiscuous port” in PVLANs refers to a port that:
a. Is isolated from all traffic
b. Can communicate with all ports in the PVLAN
c. Only receives broadcast packets
d. Supports only trunking
Answer: bgeeksforgeeks+2
Which requirement is essential for implementing PVLANs?
a. Switches must support PVLAN feature
b. All devices must be in the same IP subnet
c. Routing must be enabled on all ports
d. All traffic must be encrypted
Answer: anetworklessons+1
Which command (conceptual) adds a port as promiscuous in Cisco IOS?
a. switchport mode access
b. switchport mode private-vlan promiscuous
c. vlan database
d. interface trunk
Answer: bipcisco+1
What issue does a PVLAN primarily address in large networks?
a. Layer 3 congestion
b. Layer 2 host isolation
c. Wireless multicast flooding
d. Spanning Tree loops
Answer: bwikipedia+2
In a hosting provider, why would PVLANs be used?
a. To allow hosts to reach each other directly
b. To isolate customers’ servers without large numbers of VLANs
c. To enforce RADIUS authentication
d. To limit bandwidth usage
Answer: bnetseccloud+1
Which configuration allows a backup network to leverage PVLANs securely?
a. Put all backup clients in isolated VLAN; servers in promiscuous port
b. Put clients and servers in the same primary VLAN
c. Enable trunking between all devices
d. Use community VLAN for all hosts
Answer: awikipedia
What does the primary VLAN do with untagged downstream frames?
a. Discards them
b. Broadcasts to all secondary VLANs
c. Forwards directly to router
d. Assigns to management VLAN
Answer: bnotes.networklessons+1
Which is a real-world benefit of PVLANs in a service provider environment?
a. Isolating each customer’s traffic even in a shared IP subnet
b. Enabling unrestricted broadcast
c. Reducing requirements for spanning tree
d. Increasing trunk bandwidth
Answer: ajuniper+2
What feature is crucial in switches when configuring PVLAN across multiple switches?
a. VTP server mode
b. PVLAN trunk support
c. Layer 3 routing
d. Loopback detection
Answer: bnotes.networklessons+1
How do PVLANs help limit broadcast storms?
a. By filtering all unicast packets
b. By splitting the broadcast domain into isolated subdomains
c. By encrypting all broadcast traffic
d. By using trunk ports only
Answer: bwikipedia+1
In Cisco’s PVLAN implementation, which term refers to hosts isolated from each other yet sharing the same subnet?
a. Isolated VLAN
b. Management VLAN
c. Trunk VLAN
d. Router VLAN
Answer: awikipedia
Which operation does not occur in a PVLAN setup?
a. Inter-VLAN routing directly on secondary VLANs
b. Communication between community ports
c. Promiscuous port acting as gateway
d. Isolation of hosts at Layer 2
Answer: anotes.networklessons+1
A port that can only talk with other hosts in its community and the promiscuous port is called:
a. Access port
b. Community port
c. Trunk port
d. Isolated port
Answer: bnotes.networklessons+1
What happens if two hosts are in different community VLANs?
a. They can exchange broadcast frames
b. They need routing via the promiscuous port to communicate
c. They can communicate directly
d. They form a trunk
Answer: bwikipedia+1
PVLANs enable what with respect to IP addressing?
a. Automatic DHCP failover
b. Use of same IP subnet for isolated hosts
c. Segregation of multicast addresses only
d. Split tunneling
Answer: bextnoc+1
Which of the following is not a valid PVLAN port type?
a. Promiscuous
b. Isolated
c. Community
d. Express
Answer: dnotes.networklessons+1
What must be enabled on a switch to use PVLANs?
a. PVLAN feature
b. Spanning Tree Root Guard
c. DHCP snooping
d. IGMP proxy
Answer: anetworklessons+1
In VLAN configuration, which is the difference between protected ports and PVLANs?
a. PVLANs operate only on management traffic
b. Protected ports are limited to one switch; PVLANs can span multiple switches
c. Protected ports use Layer 3
d. There is no difference
Answer: bnotes.networklessons
What is a key security benefit of PVLANs in a virtualized data center?
a. Allowing all VMs to share the same subnet without direct Layer 2 communication
b. Increasing SNMP traffic
c. Automatically merging VLANs
d. Allowing layer 3 routing on all ports
Answer: awikipedia+1
If a switch port is configured as “private-vlan host”, what type of port is this?
a. Promiscuous
b. Isolated or community (depending on association)
c. Trunk
d. Management
Answer: bipcisco+1
When configuring PVLANs, which type of VLAN contains all the community and isolated VLANs?
a. Primary VLAN
b. Trunk VLAN
c. Root VLAN
d. Access VLAN
Answer: ageeksforgeeks+2
On which OSI layer do PVLANs operate?
a. Layer 1
b. Layer 2
c. Layer 3
d. Layer 4
Answer: bgeeksforgeeks+2
Which statement best describes the function of isolated VLANs?
a. All hosts can communicate freely
b. Hosts are isolated from each other and only connect to the gateway
c. Promiscuous and community ports are allowed
d. All ports can trunk
Answer: bwikipedia+1
In a PVLAN, which port must be configured for the router or firewall?
a. Isolated port
b. Community port
c. Promiscuous port
d. Access port
Answer: cjuniper+2
By design, PVLANs are most effective in which environments?
a. Small home networks only
b. Large enterprise or provider environments
c. Only in wireless LANs
d. Routing backbones
Answer: buninets+2
To allow selective communication between services in a shared subnet, the preferred technology is:
a. Protected ports
b. PVLANs
c. OSPF
d. MST
Answer: bnetworklessons+1
What defines the extent of a PVLAN segment in a switched network?
a. Trunk port connection
b. Spanning Tree root
c. Broadcast domain split by the primary VLAN
d. IP address range
Answer: cnotes.networklessons+1
If all PVLANs are deleted from the configuration, what happens?
a. All ports revert to normal VLAN mode
b. Switch stops functioning
c. Trunking breaks
d. Internet access fails
Answer: awikipedia+1
Is it possible to have multiple isolated VLANs associated with one primary VLAN in PVLANs?
a. Yes
b. No
c. Only on access switches
d. Only for IPv6
Answer: aknowledge.broadcom+1

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