Ethernet Switching And Spanning Tree

When configuring advanced VLAN mapping on a Juniper MX Series router using flexible VLAN tagging, which term describes the action of replacing an incoming inner VLAN tag with a new tag before forwarding into the provider core?

You need to design a scalable Layer 2 architecture across multiple data center buildings using Juniper switches, avoiding single points of failure while preventing bridging loops. Which scaling mechanism allows Active-Active multihoming without running Spanning Tree Protocol across the core?

An administrator implements MSTP (Multiple Spanning Tree Protocol) in a large data center using Juniper switches. Region boundaries must be maintained strictly. Which three parameters must match identically across all switches for them to be considered part of the same MST region?

You are configuring Q-in-Q tunneling on an MX Series router where customer frames arrive with VLAN tag 100, and you need to encapsulate them with a service provider outer VLAN tag 3000 using 'vlan-map'. Where is the VLAN map applied?

You are configuring private VLANs (PVLANs) on a Juniper EX switch to isolate customer ports from one another while sharing a common gateway. Which VLAN type is configured to allow communication only with promiscuous ports?

You are configuring MAC limiting on an EX Series switch interface to restrict the maximum number of learned MAC addresses to 10. What happens when the 11th unique MAC address attempts to communicate through the interface?

In a Juniper Virtual Chassis scaling deployment comprising 10 EX4600 switches, how are control and management planes structured across member switches to maintain high availability and failover resilience?

An engineer is troubleshooting a large-scale enterprise network with multiple MSTP regions connected by a legacy RSTP region. How do boundary switches running MSTP interact with RSTP switches on shared segments?

You want to configure voice VLAN functionality on a Juniper EX switch so that IP phones automatically place voice traffic into VLAN 50 while passing PC data through unchanged. Which feature should you configure?

An enterprise network engineer is designing a redundant Layer 2 topology with MSTP across Juniper EX switches. Two switches have identical bridge priorities and MAC addresses that result in a tie for regional root. How does MSTP deterministically break the tie to select the regional root bridge?

You are configuring Ethernet switching on an EX4300 switch and need to implement storm control to prevent broadcast, multicast, and unknown unicast traffic from overwhelming access links. Where is storm-control applied in the Junos configuration hierarchy?

An enterprise network uses Q-in-Q tunneling over an MX Series provider network. Customer BPDUs must pass transparently across the provider core without being processed by the provider's own VSTP/MSTP instances. Which feature must be enabled on the provider switch access ports to achieve this?

Which TWO operational commands are valid for troubleshooting VSTP on Juniper EX switches? (Choose two)

You are configuring MACsec (Media Access Control Security) on an EX Series switch interface to secure Layer 2 links between two enterprise buildings. Which requirement is mandatory for MACsec to establish a secure session successfully between the two switches?

Which THREE features or protocols are used in Juniper enterprise switching environments to prevent Layer 2 bridging loops while avoiding traditional Spanning Tree blocking ports? (Choose three)

Which TWO actions can be triggered when a MAC address limit is exceeded on a Juniper switch interface configured with MAC limiting? (Choose two)

When configuring advanced Q-in-Q tunneling on Juniper MX Series routers, which THREE encapsulation or tagging parameters must be correctly aligned between the customer edge and provider edge interfaces? (Choose three)

Which TWO parameters are part of the standard MSTP configuration digest computed across switches in an MST region? (Choose two)

Which TWO security features can be configured on Juniper EX switches to prevent DHCP spoofing and ARP poisoning attacks on Layer 2 access ports? (Choose two)

Which TWO statements describe the behavior of VSTP (VLAN Spanning Tree Protocol) on Juniper EX Series switches? (Choose two)

You are designing an enterprise network running Multiple Spanning Tree Protocol (MSTP) across multiple data center switches. To ensure that switches belong to the same MST region, which three parameters must match identically across all switches in that region?

An engineer is configuring a QinQ tunnel where the service provider bridge needs to transparently carry customer control traffic (like STP BPDUs) through the core without processing them. What feature must be enabled on the provider edge access ports?

When designing advanced enterprise campus VLAN architectures with Juniper EX Series switches, which TWO considerations are critical for large-scale Layer 2 domains? (Choose two)

When configuring advanced Layer 2 tunneling (Q-in-Q) on Juniper EX Series switches, which THREE statements are correct regarding VLAN stacking behavior and limitations? (Choose three)

You are troubleshooting a Juniper EX Series switch running RSTP. The network experiences intermittent loops. You suspect that BPDU guard is not functioning as expected on an edge port. Which statement is correct about BPDU guard behavior on EX Series switches?

You are configuring a Juniper EX Series switch to support a VoIP deployment. You want to ensure that voice traffic from IP phones is placed in VLAN 100 and data traffic in VLAN 200, with the phone tagging voice packets with 802.1p priority 5. Which feature should you configure?

You are deploying a Juniper EX Series switch as an access layer device in a campus network. The uplink port ge-0/0/1 connects to a distribution switch and is expected to carry traffic for VLANs 10, 20, and 30. You want to prevent the access switch from becoming the root bridge for any of these VLANs and ensure that the uplink is preferred for forwarding. Which configuration should you apply on the access switch?

An engineer is deploying VSTP (VLAN Spanning Tree Protocol) on a Juniper EX Series switch in a network that also includes RSTP bridges. The engineer wants to ensure that VSTP BPDUs are properly handled and that the network converges quickly. Which statement about VSTP operation is correct?

You are configuring a Juniper EX Series switch to prevent loops in a VSTP environment. An access port connected to an end-user device is receiving BPDUs from an unauthorized switch. You want to automatically disable the port if BPDUs are received. Which feature should you enable on the access port?

You are configuring RSTP on a Juniper EX Series switch. You need to ensure that the switch can quickly converge in case of a link failure. Which two statements are correct about RSTP edge ports and their configuration? (Choose two.)

You are configuring a Juniper EX Series switch to support a Layer 2 network with multiple VLANs. You want to use RSTP for faster convergence but need to ensure that each VLAN has its own spanning-tree instance. Which feature should you enable?

You are implementing MSTP on a network of Juniper EX Series switches. You need to ensure that the MSTP region is correctly configured and that VLANs are mapped to the appropriate MSTIs. Which two statements are correct about MSTP configuration on Juniper EX switches? (Choose two.)