What are two differences between RSTP and VSTP? (Choose two.)
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A. B. C. D.AB
RSTP (Rapid Spanning Tree Protocol) and VSTP (Virtual Switching Instance Protocol) are two different protocols used for creating a loop-free topology within a network. They have some similarities, but there are also differences between them.
The two differences between RSTP and VSTP are:
A. Using VSTP, the BPDU destination address is always 01:00:0C:CC:CC:CD. B. Using VSTP, the BPDU frame carries an 802.1Q tag.
Explanation:
A. BPDU (Bridge Protocol Data Unit) is a message exchanged between switches to elect a root bridge and build a loop-free topology. In VSTP, the BPDU destination address is always 01:00:0C:CC:CC:CD, which is a multicast MAC address used for VSTP BPDUs. On the other hand, in RSTP, the BPDU destination address is always 01:80:C2:00:00:00, which is a multicast MAC address used for RSTP BPDUs.
B. The 802.1Q tag is a standard for VLAN tagging in Ethernet networks. In VSTP, the BPDU frame carries an 802.1Q tag, which allows the protocol to distinguish between multiple instances of the spanning tree running on the same physical links. This enables VSTP to support multiple VLANs, each with its own instance of the spanning tree. On the other hand, in RSTP, the BPDU frame does not carry an 802.1Q tag.
In summary, VSTP is an extension of RSTP that supports multiple VLANs by using an 802.1Q tag in its BPDU frames and a specific multicast MAC address for BPDUs. RSTP, on the other hand, does not support multiple VLANs and uses a different multicast MAC address for its BPDUs.