Which of the following private VLAN port types communicate only with promiscuous ports? (Select the best
answer.)
A.
community ports
B.
isolated ports
C.
SPAN ports
D.
promiscuous ports
Explanation:
Isolated private virtual LAN (VLAN) ports can communicate only with promiscuous ports. Private VLANs can be
configured on a switch to help isolate traffic within a VLAN. Private VLANs can provide Layer 2 separation
between ports that belong to the same VLAN. Because the separation exists at Layer 2, the hosts can exist on
the same IP subnet. The VLAN to which the hosts belong is called the primary VLAN. To create a private
VLAN, you must create secondary VLANs and associate them with the primary VLAN.
Community private VLAN ports can communicate with promiscuous ports and with other ports that belong to
the same community. However, they cannot communicate with isolated ports or with ports that belong to other
communities. Promiscuous ports can communicate with all other private VLAN port types.
Switch Port Analyzer (SPAN) ports are not a private VLAN port type. SPAN is a means of monitoring traffic on a
switch by copying packets from a source port to a monitored port or mirrored port.Cisco: Configuring Isolated Private VLANs on Catalyst Switches: Background Theory