Which three statements about VSTP are correct? (Choose three.)

VLAN Spanning Tree Protocol (VSTP) is a Juniper Networks implementation that creates a separate Spanning Tree instance for each configured VLAN. This per-VLAN approach allows for different logical topologies and enables load balancing by assigning different root bridges for different VLANs. Each VSTP instance sends its own BPDUs, which are tagged with the corresponding VLAN ID, to maintain its unique topology. While the protocol can theoretically support more, on Juniper EX Series switches, VSTP is limited to a maximum of 253 unique spanning tree topologies (instances).

B. VSTP is incompatible with RSTP.

This is incorrect. VSTP is based on the IEEE 802.1w standard, which defines Rapid Spanning Tree Protocol (RSTP), and is fully compatible with it.

C. VSTP is enabled by default on EX Series switches.

This is incorrect. Rapid Spanning Tree Protocol (RSTP) is the default STP protocol enabled on EX Series switches, not VSTP.

1. Juniper Networks TechLibrary, "Understanding VSTP": This document states, "VSTP keeps a separate spanning-tree instance running for each VLAN." (Confirms E). It also explains, "BPDUs for a given VSTP instance are sent to the MAC address 01:00:0c:cc:cc:cd with the corresponding VLAN tag." (Confirms A). The document further specifies, "the maximum number of supported VLANs on EX Series switches is 253 for VSTP." (Confirms D).

2. Juniper Networks TechLibrary, "Spanning-Tree Protocols User Guide for EX Series Switches": In the "Default STP Configuration on Switches" section, it is noted that "By default, the Rapid Spanning Tree Protocol (RSTP) is enabled on all interfaces on EX Series switches..." (Confirms C is incorrect).

3. Juniper Networks TechLibrary, "Example: Configuring VSTP on EX Series Switches": This guide mentions that VSTP is based on the IEEE 802.1w standard (RSTP), which implies compatibility. (Confirms B is incorrect).