An EX Series switch running RSTP receives BPDUs with superior path cost information from an unauthorized access switch. Which feature should you enable on access-facing ports to prevent these unauthorized BPDUs from altering the spanning tree topology?
You are troubleshooting a suboptimal spanning tree topology where an EX4300 switch is chosen as the STP Root Bridge despite having a high bridge priority. What command helps verify the current bridge priority and local bridge identifier parameters?
An administrator has deployed a new EX Series switch running RSTP and notices that access ports connected to end-user workstations take up to 30 seconds to transition to the forwarding state. Which configuration command should be applied to immediately resolve this delay for access ports?
You suspect that a network loop has formed due to a misconfigured RSTP topology on your EX Series switches. Which command shows real-time topology change notifications and counts on the switch?
Which command is used to display comprehensive spanning tree status, including port roles, states, and priorities across all interfaces on an EX Series switch?
You are troubleshooting an RSTP topology where a port remains in the discarding state. You suspect a proposal-agreement handshake is failing. Which mechanism is responsible for accelerating this handshake in RSTP?
You notice that an EX Series switch is experiencing frequent topology changes, causing intermittent packet drops across VLANs. Which command helps identify which specific interface is generating the topology changes?
You need to verify the regional configuration name and revision number currently active on an EX Series switch running MSTP. Which operational command should you use?
An administrator needs to configure a Juniper EX Series switch to participate in an existing Spanning Tree topology without risking the switch becoming the root bridge. Which command should be used to achieve this?
While troubleshooting an RSTP topology on EX Series switches, you notice that a designated port has stopped receiving BPDUs from its upstream neighbor due to a unidirectional link failure. Which feature should you enable to prevent this port from transitioning to a Designated Forwarding state and causing a loop?
When verifying RSTP operation on a Junos switch, which operational command should you use to view the bridge identifier, root bridge identifier, and local port states?
An administrator is configuring MSTP on a Junos device and needs to map VLANs 10 through 20 to MST instance 2. Which configuration hierarchy is required to achieve this?
In an RSTP-enabled network, which port role immediately transitions to the forwarding state upon failure of the designated port on the segment, bypassing the traditional listening and learning states?
Which TWO actions occur when you configure an interface as an edge port using 'set protocols rstp interface ge-0/0/10.0 edge' on a Juniper switch? (Choose two.)
When configuring and verifying MSTP on Junos devices, which THREE statements are correct regarding regional boundaries and communication? (Choose three.)
You administer an EX Series switch running RSTP. Interface ge-0/0/12 is connected to a downstream switch that is the designated bridge for that segment. However, you notice that ge-0/0/12 is in a discarding state and not forwarding traffic. You want to verify the port's RSTP role and state. Which command displays the RSTP role and state for ge-0/0/12?
You manage a network of EX Series switches running RSTP. Users report intermittent connectivity issues. You suspect a unidirectional link failure on a point-to-point link between two switches. Which RSTP mechanism is designed to detect and mitigate this type of failure?
You are configuring RSTP on a Juniper EX Series switch. You want to ensure that the switch becomes the root bridge for a specific VLAN. Which two parameters can you adjust to influence the root bridge election? (Choose two.)
You are configuring RSTP on a Juniper EX Series switch. You want to ensure that the switch does not participate in the spanning-tree topology for a specific VLAN, but still passes traffic for that VLAN. Which two statements are correct about disabling RSTP on a per-VLAN basis? (Choose two.)
You are troubleshooting an RSTP network on EX Series switches. You need to identify which port on a non-root switch is the Root Port. Which command displays the Root Port for a given VLAN?
You are deploying RSTP in a network with EX Series switches. You want to ensure that a specific switch is always the root bridge for a particular VLAN. Which configuration would you apply?
An administrator needs to configure MSTP on a group of EX Series switches. Which three parameters must be identical across all switches in the same MST region?
You need to ensure that a core switch retains its position as the root bridge even if a new switch with a manually lowered bridge priority is added to the network. Which feature should you configure on the core switch's ports facing the downstream switches?
While examining an RSTP topology, you notice that a designated port has suddenly stopped receiving BPDUs from its upstream neighbor, causing the port to transition into a discarding state to prevent potential loops. Which feature is actively providing this protection?
An operator configures RSTP across multiple EX Series switches. A rogue switch running legacy STP is connected to an RSTP switch. How does the RSTP switch handle interaction with the legacy STP switch?
You need to modify the bridge priority of an EX Series switch running RSTP to ensure it becomes the root bridge. Which configuration command correctly sets the bridge priority to 4096?
An administrator configures link aggregation (ae0) using LACP between two EX Series switches running RSTP. How does RSTP treat the aggregated interface ae0?
An organization runs MSTP with multiple instances. A packet belonging to a VLAN that is not explicitly mapped to any MST instance is processed in which manner?
An EX Series switch running MSTP receives a BPDU from an upstream switch in a different MST region. How does the receiving switch identify the boundary between the two regions?
You want to disable spanning tree protocol entirely on a specific access interface (ge-0/0/10.0) of an EX Series switch while keeping RSTP active globally. Which configuration command achieves this?
An administrator configures root protection on a designated port. If that port subsequently receives a superior BPDU from another switch, what exact state does the port transition into?
You notice that an access switch running RSTP is continually dropping user traffic because a connected end-user device is sending inferior BPDUs that trigger topology changes. Which Juniper feature should you configure on the access ports to protect against this behavior?
You are configuring Multiple Spanning Tree Protocol (MSTP) across multiple EX Series switches in your enterprise network. Which three parameters must be identical across all switches to ensure they belong to the same MST region?
You have an EX Series switch running RSTP. You notice that a port connected to a server is flapping between forwarding and discarding states. The server NIC is configured for teaming but is not sending BPDUs. You have configured the port as an edge port using 'set protocols rstp interface ge-0/0/5 edge'. However, the port still flaps. What is the most likely cause?
You are troubleshooting an RSTP network. You notice that a port on an EX Series switch is flapping between Discarding and Forwarding states. You suspect a BPDU inconsistency. Which command would you use to check for BPDU inconsistencies on the switch?
You have an EX Series switch running RSTP. You want to configure a port connected to a printer to immediately transition to forwarding without going through the learning state. Which configuration statement should you use?