Which three STP protection mechanisms are supported on MX Series, EX Series, and QFX Series devices? (Choose three.)
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A. B. C. D. E.BCE
Sure, here's a detailed explanation of the three STP protection mechanisms supported on MX Series, EX Series, and QFX Series devices:
BPDU Protection: This mechanism protects the Spanning Tree Protocol (STP) domain against malicious or accidental introduction of rogue switches by blocking unauthorized Bridge Protocol Data Units (BPDUs). BPDUs are messages exchanged between switches to negotiate the root bridge election, topology change notifications, and other STP-related information. BPDU protection feature can be enabled on interfaces that connect to end-user devices or edge switches to prevent unauthorized switches from being connected to the network. If a port receives a BPDU message, it will be placed in a blocked state, preventing any traffic from flowing through it.
Loop Protection: This mechanism is designed to detect and mitigate loops in the network topology. When a loop occurs, it can cause broadcast storms, packet loss, and other network disruptions. Loop protection can detect such loops and take action to prevent them from causing network problems. When enabled on an interface, loop protection monitors the incoming and outgoing traffic on that port for signs of a loop. If a loop is detected, the interface will be placed in a blocked state to prevent any further traffic from entering the loop.
Root Protection: This mechanism prevents unauthorized switches from becoming the root bridge of the STP domain. The root bridge is the most important switch in the STP domain, as it determines the path that all traffic takes through the network. Root protection can be enabled on interfaces that connect to switches that are not supposed to become the root bridge. When enabled, root protection monitors the incoming BPDUs and compares them to the current root bridge. If a switch sends a BPDU claiming to be the root bridge, and it is not the current root bridge, the interface will be placed in a blocked state. This prevents the switch from becoming the root bridge and disrupting the network topology.
Access Protection: This mechanism is used to protect a switch's access ports from being used to carry traffic from other VLANs. Access protection is typically used in conjunction with Private VLANs (PVLANs) to provide an additional layer of security to the network. When enabled on an access port, access protection prevents any traffic that is not associated with the configured VLAN from entering or leaving the port. This helps to prevent any unauthorized access to the network.
In conclusion, the three STP protection mechanisms supported on MX Series, EX Series, and QFX Series devices are BPDU protection, loop protection, and root protection. These features help to ensure the stability, security, and reliability of the network by preventing loops, unauthorized switches, and improper VLAN configurations from causing network problems.