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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 40

Question 390

A Junos network engineer takes this step: Add VLAN 40 to the eligible tagged membership on the inter-switch trunk. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the Trunk VLAN allowance decision: The uplink can carry tagged traffic for both required VLANs.

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 MAC learning verification (Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces.), not the specified action.

C:

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

Question 391

Two switches need to carry VLANs 30 and 40 between them but VLAN 40 is missing from the allowed trunk list. A colleague instead suggests: Place the hosts in an appropriate private VLAN community association. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses Trunk VLAN allowance. The uplink can carry tagged traffic for both required VLANs.

Incorrect Answers

B:

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

C:

That alternative applies to MAC learning verification instead. The operator can determine whether the peer MAC has been learned at the expected port.

D:

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

Question 392

An enterprise network designer recommends: Add VLAN 40 to the eligible tagged membership on the inter-switch trunk. 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. Two switches need to carry VLANs 30 and 40 between them but VLAN 40 is missing from the allowed trunk list.
  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. A cluster of related hosts should communicate with each other but remain segregated from hosts assigned to other private VLAN communities.

Explanation

Correct Answer

B:

This case requires the Trunk VLAN allowance action. The uplink can carry tagged traffic for both required VLANs.

Incorrect Answers

A:

This other case would be better matched to Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces. The operator can determine whether the peer MAC has been learned at the expected port.

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 Place the hosts in an appropriate private VLAN community association. Members of the same community can communicate without opening access to separate communities.

Question 393

Several untrusted guest appliances share the same primary VLAN but must not communicate directly with each other. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

C:

This action addresses Private VLAN isolation. Isolated hosts can reach permitted upstream services without communicating directly with each other.

Incorrect Answers

A:

That action targets Access port assignment: Untagged frames from the printer are associated with the intended access VLAN. It does not directly resolve the stated Private VLAN isolation requirement.

B:

That action targets Private VLAN promiscuous uplink: The gateway can serve isolated downstream hosts without making the hosts mutually reachable. It does not directly resolve the stated Private VLAN isolation requirement.

D:

That action targets IRB L3 gateway: The switch can route between the configured Layer 2 broadcast domains under security policy. It does not directly resolve the stated Private VLAN isolation requirement.

Question 394

A Junos network engineer takes this step: Use the supported private VLAN isolated-port behavior with a suitable promiscuous uplink. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the Private VLAN isolation decision: Isolated hosts can reach permitted upstream services without communicating directly with each other.

Incorrect Answers

A:

This outcome is associated with IRB L3 gateway (Configure routed IRB interfaces and associated VLAN gateway bindings.), not the specified action.

B:

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

C:

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.

Question 395

Several untrusted guest appliances share the same primary VLAN but must not communicate directly with each other. A colleague instead suggests: Connect the permitted gateway using the private VLAN promiscuous-port role. 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

A:

This corrective choice addresses Private VLAN isolation. Isolated hosts can reach permitted upstream services without communicating directly with each other.

Incorrect Answers

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.

D:

That alternative applies to IRB L3 gateway instead. The switch can route between the configured Layer 2 broadcast domains under security policy.

Question 396

An enterprise network designer recommends: Use the supported private VLAN isolated-port behavior with a suitable promiscuous uplink. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the Private VLAN isolation action. Isolated hosts can reach permitted upstream services without communicating directly with each other.

Incorrect Answers

A:

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.

C:

This other case would be better matched to Configure routed IRB interfaces and associated VLAN gateway bindings. The switch can route between the configured Layer 2 broadcast domains under security policy.

D:

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.

Question 397

A cluster of related hosts should communicate with each other but remain segregated from hosts assigned to other private VLAN communities. Which Junos networking action or protocol decision best addresses this requirement?

  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. Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces.
  4. Configure a supported filter-based VLAN assignment policy for the intended traffic classes.

Explanation

Correct Answer

A:

This action addresses Private VLAN community. Members of the same community can communicate without opening access to separate communities.

Incorrect Answers

B:

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

C:

That action targets MAC learning verification: The operator can determine whether the peer MAC has been learned at the expected port. It does not directly resolve the stated Private VLAN community 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 Private VLAN community requirement.

Question 398

A Junos network engineer takes this step: Place the hosts in an appropriate private VLAN community association. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the Private VLAN community decision: Members of the same community can communicate without opening access to separate communities.

Incorrect Answers

A:

This outcome is associated with MAC learning verification (Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces.), not the specified action.

C:

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

Question 399

A cluster of related hosts should communicate with each other but remain segregated from hosts assigned to other private VLAN communities. A colleague instead suggests: Configure a supported filter-based VLAN assignment policy for the intended traffic classes. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

This corrective choice addresses Private VLAN community. Members of the same community can communicate without opening access to separate communities.

Incorrect Answers

A:

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

B:

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

D:

That alternative applies to MAC learning verification instead. The operator can determine whether the peer MAC has been learned at the expected port.

Question 400

An enterprise network designer recommends: Place the hosts in an appropriate private VLAN community association. Which situation most clearly calls for this action?

  1. Two switches need to carry VLANs 30 and 40 between them but VLAN 40 is missing from the allowed trunk list.
  2. A host reaches its local VLAN but traffic for a peer is flooded, suggesting the destination MAC is not learned.
  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. A cluster of related hosts should communicate with each other but remain segregated from hosts assigned to other private VLAN communities.

Explanation

Correct Answer

D:

This case requires the Private VLAN community action. Members of the same community can communicate without opening access to separate communities.

Incorrect Answers

A:

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.

B:

This other case would be better matched to Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces. The operator can determine whether the peer MAC has been learned at the expected port.

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.

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