Configure Interswitch VLAN Communication
Question
An engineer must configure interswitch VLAN communication between a Cisco switch and a third-party switch.
Which action should be taken?
Answers
Explanations
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A. B. C. D.B.
VLAN trunking offers two options, ISL and 802.1Q.ISL is Cisco proprietary while 802.1Q is standards based and supported by multiple vendors.
To enable VLAN communication between a Cisco switch and a third-party switch, the switches need to be configured with a VLAN trunking protocol that they both support. VLAN trunking protocols allow multiple VLANs to be carried over a single physical link between switches.
Out of the given options, the correct answer is B. configure IEEE 802.1q. IEEE 802.1q is a VLAN trunking protocol that is supported by almost all modern switches, including Cisco switches and third-party switches. It allows the switches to exchange VLAN information so that traffic can be correctly tagged and forwarded between VLANs.
Option A, configure DSCP, is not related to VLAN trunking. DSCP (Differentiated Services Code Point) is used to classify and prioritize network traffic based on its characteristics.
Option C, configure ISL, is also a VLAN trunking protocol, but it is a Cisco proprietary protocol and is not supported by third-party switches.
Option D, configure IEEE 802.1p, is a Quality of Service (QoS) protocol that is used to prioritize network traffic based on its class of service. It is not related to VLAN trunking.
In summary, to enable interswitch VLAN communication between a Cisco switch and a third-party switch, configure IEEE 802.1q on both switches.
