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Exam Code: JN0-650

Exam Name: Enterprise Routing and Switching, Professional (JNCIP-ENT)

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

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Juniper JN0-650 Practice Test 42

Question 410

A Junos network engineer takes this step: Configure routed IRB interfaces and associated VLAN gateway bindings. Which outcome most directly follows?

  1. Isolated hosts can reach permitted upstream services without communicating directly with each other.
  2. Untagged frames from the printer are associated with the intended access VLAN.
  3. The switch can route between the configured Layer 2 broadcast domains under security policy.
  4. The gateway can serve isolated downstream hosts without making the hosts mutually reachable.

Explanation

Correct Answer

C:

This is the direct result of the IRB L3 gateway decision: The switch can route between the configured Layer 2 broadcast domains under security policy.

Incorrect Answers

A:

This outcome is associated with Private VLAN isolation (Use the supported private VLAN isolated-port behavior with a suitable promiscuous uplink.), not the specified action.

B:

This outcome is associated with Access port assignment (Configure the endpoint-facing interface as an appropriate untagged access member of VLAN 120.), not the specified action.

D:

This outcome is associated with Private VLAN promiscuous uplink (Connect the permitted gateway using the private VLAN promiscuous-port role.), not the specified action.

Question 411

Hosts in two separate VLANs require routed IP communication through a Junos switch instead of only Layer 2 bridging. A colleague instead suggests: Configure the endpoint-facing interface as an appropriate untagged access member of VLAN 120. Which corrective approach most directly addresses the original issue?

  1. Use the supported private VLAN isolated-port behavior with a suitable promiscuous uplink.
  2. Configure the endpoint-facing interface as an appropriate untagged access member of VLAN 120.
  3. Connect the permitted gateway using the private VLAN promiscuous-port role.
  4. Configure routed IRB interfaces and associated VLAN gateway bindings.

Explanation

Correct Answer

D:

This corrective choice addresses IRB L3 gateway. The switch can route between the configured Layer 2 broadcast domains under security policy.

Incorrect Answers

A:

That alternative applies to Private VLAN isolation instead. Isolated hosts can reach permitted upstream services without communicating directly with each other.

B:

That alternative applies to Access port assignment instead. Untagged frames from the printer are associated with the intended access VLAN.

C:

That alternative applies to Private VLAN promiscuous uplink instead. The gateway can serve isolated downstream hosts without making the hosts mutually reachable.

Question 412

An enterprise network designer recommends: Configure routed IRB interfaces and associated VLAN gateway bindings. Which situation most clearly calls for this action?

  1. Hosts in two separate VLANs require routed IP communication through a Junos switch instead of only Layer 2 bridging.
  2. Several untrusted guest appliances share the same primary VLAN but must not communicate directly with each other.
  3. Multiple isolated ports need a shared gateway for routing while remaining blocked from lateral peer communication.
  4. A printer attached to a switch must communicate on VLAN 120 without inserting 802.1Q tags itself.

Explanation

Correct Answer

A:

This case requires the IRB L3 gateway action. The switch can route between the configured Layer 2 broadcast domains under security policy.

Incorrect Answers

B:

This other case would be better matched to Use the supported private VLAN isolated-port behavior with a suitable promiscuous uplink. Isolated hosts can reach permitted upstream services without communicating directly with each other.

C:

This other case would be better matched to Connect the permitted gateway using the private VLAN promiscuous-port role. The gateway can serve isolated downstream hosts without making the hosts mutually reachable.

D:

This other case would be better matched to Configure the endpoint-facing interface as an appropriate untagged access member of VLAN 120. Untagged frames from the printer are associated with the intended access VLAN.

Question 413

A host reaches its local VLAN but traffic for a peer is flooded, suggesting the destination MAC is not learned. Which Junos networking action or protocol decision best addresses this requirement?

  1. Place the hosts in an appropriate private VLAN community association.
  2. Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces.
  3. Add VLAN 40 to the eligible tagged membership on the inter-switch trunk.
  4. Configure a supported filter-based VLAN assignment policy for the intended traffic classes.

Explanation

Correct Answer

B:

This action addresses MAC learning verification. The operator can determine whether the peer MAC has been learned at the expected port.

Incorrect Answers

A:

That action targets Private VLAN community: Members of the same community can communicate without opening access to separate communities. It does not directly resolve the stated MAC learning verification requirement.

C:

That action targets Trunk VLAN allowance: The uplink can carry tagged traffic for both required VLANs. It does not directly resolve the stated MAC learning verification requirement.

D:

That action targets Filter-based VLAN selection: Matching traffic can be associated with the VLAN selected by the filter criteria. It does not directly resolve the stated MAC learning verification requirement.

Question 414

A Junos network engineer takes this step: Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces. Which outcome most directly follows?

  1. Matching traffic can be associated with the VLAN selected by the filter criteria.
  2. The uplink can carry tagged traffic for both required VLANs.
  3. The operator can determine whether the peer MAC has been learned at the expected port.
  4. Members of the same community can communicate without opening access to separate communities.

Explanation

Correct Answer

C:

This is the direct result of the MAC learning verification decision: The operator can determine whether the peer MAC has been learned at the expected port.

Incorrect Answers

A:

This outcome is associated with Filter-based VLAN selection (Configure a supported filter-based VLAN assignment policy for the intended traffic classes.), not the specified action.

B:

This outcome is associated with Trunk VLAN allowance (Add VLAN 40 to the eligible tagged membership on the inter-switch trunk.), not the specified action.

D:

This outcome is associated with Private VLAN community (Place the hosts in an appropriate private VLAN community association.), not the specified action.

Question 415

A host reaches its local VLAN but traffic for a peer is flooded, suggesting the destination MAC is not learned. A colleague instead suggests: Add VLAN 40 to the eligible tagged membership on the inter-switch trunk. Which corrective approach most directly addresses the original issue?

  1. Place the hosts in an appropriate private VLAN community association.
  2. Add VLAN 40 to the eligible tagged membership on the inter-switch trunk.
  3. Configure a supported filter-based VLAN assignment policy for the intended traffic classes.
  4. Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces.

Explanation

Correct Answer

D:

This corrective choice addresses MAC learning verification. The operator can determine whether the peer MAC has been learned at the expected port.

Incorrect Answers

A:

That alternative applies to Private VLAN community instead. Members of the same community can communicate without opening access to separate communities.

B:

That alternative applies to Trunk VLAN allowance instead. The uplink can carry tagged traffic for both required VLANs.

C:

That alternative applies to Filter-based VLAN selection instead. Matching traffic can be associated with the VLAN selected by the filter criteria.

Question 416

An enterprise network designer recommends: Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces. Which situation most clearly calls for this action?

  1. A host reaches its local VLAN but traffic for a peer is flooded, suggesting the destination MAC is not learned.
  2. A cluster of related hosts should communicate with each other but remain segregated from hosts assigned to other private VLAN communities.
  3. A switched access design requires ingress frames to be assigned to VLANs according to a supported classification filter rather than a static port-only choice.
  4. Two switches need to carry VLANs 30 and 40 between them but VLAN 40 is missing from the allowed trunk list.

Explanation

Correct Answer

A:

This case requires the MAC learning verification action. The operator can determine whether the peer MAC has been learned at the expected port.

Incorrect Answers

B:

This other case would be better matched to Place the hosts in an appropriate private VLAN community association. Members of the same community can communicate without opening access to separate communities.

C:

This other case would be better matched to Configure a supported filter-based VLAN assignment policy for the intended traffic classes. Matching traffic can be associated with the VLAN selected by the filter criteria.

D:

This other case would be better matched to Add VLAN 40 to the eligible tagged membership on the inter-switch trunk. The uplink can carry tagged traffic for both required VLANs.

Question 417

Adjacent switches must advertise dynamic VLAN membership on an inter-switch connection instead of manual provisioning of every allowed VLAN. Which Junos networking action or protocol decision best addresses this requirement?

  1. Configure the specified VLAN and trunk membership statically instead of adding MVRP complexity.
  2. Use Multiple VLAN Registration Protocol on supported participating interfaces.
  3. Inspect operational MVRP registration and learned VLAN status on affected interfaces.
  4. Verify MVRP capability and configuration on both ends of the trunk.

Explanation

Correct Answer

B:

This action addresses MVRP automatic VLAN exchange. Switches can exchange VLAN registration information dynamically over the connection.

Incorrect Answers

A:

That action targets Static VLAN alternative: The intended VLAN can operate without a dynamic registration dependency. It does not directly resolve the stated MVRP automatic VLAN exchange requirement.

C:

That action targets MVRP learned VLAN state: The team can identify which trunk advertised or withdrew VLAN membership. It does not directly resolve the stated MVRP automatic VLAN exchange requirement.

D:

That action targets MVRP neighbor support: Both switches can participate in supported VLAN registration exchanges. It does not directly resolve the stated MVRP automatic VLAN exchange requirement.

Question 418

A Junos network engineer takes this step: Use Multiple VLAN Registration Protocol on supported participating interfaces. Which outcome most directly follows?

  1. The team can identify which trunk advertised or withdrew VLAN membership.
  2. Both switches can participate in supported VLAN registration exchanges.
  3. Switches can exchange VLAN registration information dynamically over the connection.
  4. The intended VLAN can operate without a dynamic registration dependency.

Explanation

Correct Answer

C:

This is the direct result of the MVRP automatic VLAN exchange decision: Switches can exchange VLAN registration information dynamically over the connection.

Incorrect Answers

A:

This outcome is associated with MVRP learned VLAN state (Inspect operational MVRP registration and learned VLAN status on affected interfaces.), not the specified action.

B:

This outcome is associated with MVRP neighbor support (Verify MVRP capability and configuration on both ends of the trunk.), not the specified action.

D:

This outcome is associated with Static VLAN alternative (Configure the specified VLAN and trunk membership statically instead of adding MVRP complexity.), not the specified action.

Question 419

Adjacent switches must advertise dynamic VLAN membership on an inter-switch connection instead of manual provisioning of every allowed VLAN. A colleague instead suggests: Verify MVRP capability and configuration on both ends of the trunk. Which corrective approach most directly addresses the original issue?

  1. Verify MVRP capability and configuration on both ends of the trunk.
  2. Inspect operational MVRP registration and learned VLAN status on affected interfaces.
  3. Configure the specified VLAN and trunk membership statically instead of adding MVRP complexity.
  4. Use Multiple VLAN Registration Protocol on supported participating interfaces.

Explanation

Correct Answer

D:

This corrective choice addresses MVRP automatic VLAN exchange. Switches can exchange VLAN registration information dynamically over the connection.

Incorrect Answers

A:

That alternative applies to MVRP neighbor support instead. Both switches can participate in supported VLAN registration exchanges.

B:

That alternative applies to MVRP learned VLAN state instead. The team can identify which trunk advertised or withdrew VLAN membership.

C:

That alternative applies to Static VLAN alternative instead. The intended VLAN can operate without a dynamic registration dependency.

Question 420

An enterprise network designer recommends: Use Multiple VLAN Registration Protocol on supported participating interfaces. Which situation most clearly calls for this action?

  1. Adjacent switches must advertise dynamic VLAN membership on an inter-switch connection instead of manual provisioning of every allowed VLAN.
  2. A VLAN never appears dynamically on a neighboring switch because one end has no MVRP support or participation.
  3. A previously available dynamic VLAN disappears after an uplink topology change and administrators must check its source.
  4. An isolated switch requires a single fixed VLAN and there is no design requirement to discover it dynamically across trunks.

Explanation

Correct Answer

A:

This case requires the MVRP automatic VLAN exchange action. Switches can exchange VLAN registration information dynamically over the connection.

Incorrect Answers

B:

This other case would be better matched to Verify MVRP capability and configuration on both ends of the trunk. Both switches can participate in supported VLAN registration exchanges.

C:

This other case would be better matched to Inspect operational MVRP registration and learned VLAN status on affected interfaces. The team can identify which trunk advertised or withdrew VLAN membership.

D:

This other case would be better matched to Configure the specified VLAN and trunk membership statically instead of adding MVRP complexity. The intended VLAN can operate without a dynamic registration dependency.

Enterprise Routing and Switching, Professional (JNCIP-ENT) (JN0-650) Practice Tests