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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 41

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.

Question 401

Multiple isolated ports need a shared gateway for routing while remaining blocked from lateral peer communication. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

B:

This action addresses Private VLAN promiscuous uplink. The gateway can serve isolated downstream hosts without making the hosts mutually reachable.

Incorrect Answers

A:

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 promiscuous uplink requirement.

C:

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 promiscuous uplink requirement.

D:

That action targets Private VLAN isolation: Isolated hosts can reach permitted upstream services without communicating directly with each other. It does not directly resolve the stated Private VLAN promiscuous uplink requirement.

Question 402

A Junos network engineer takes this step: Connect the permitted gateway using the private VLAN promiscuous-port role. Which outcome most directly follows?

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

Explanation

Correct Answer

C:

This is the direct result of the Private VLAN promiscuous uplink decision: The gateway can serve isolated downstream hosts without making the hosts mutually reachable.

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

D:

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 403

Multiple isolated ports need a shared gateway for routing while remaining blocked from lateral peer communication. A colleague instead suggests: Configure routed IRB interfaces and associated VLAN gateway bindings. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

D:

This corrective choice addresses Private VLAN promiscuous uplink. The gateway can serve isolated downstream hosts without making the hosts mutually reachable.

Incorrect Answers

A:

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

B:

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

C:

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

Question 404

An enterprise network designer recommends: Connect the permitted gateway using the private VLAN promiscuous-port role. Which situation most clearly calls for this action?

  1. Multiple isolated ports need a shared gateway for routing while remaining blocked from lateral peer communication.
  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. 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 Private VLAN promiscuous uplink action. The gateway can serve isolated downstream hosts without making the hosts mutually reachable.

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 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 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 405

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. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

C:

This action addresses Filter-based VLAN selection. Matching traffic can be associated with the VLAN selected by the filter criteria.

Incorrect Answers

A:

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

B:

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 Filter-based VLAN selection requirement.

D:

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 Filter-based VLAN selection requirement.

Question 406

A Junos network engineer takes this step: Configure a supported filter-based VLAN assignment policy for the intended traffic classes. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the Filter-based VLAN selection decision: Matching traffic can be associated with the VLAN selected by the filter criteria.

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.

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.

C:

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

Question 407

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. A colleague instead suggests: Inspect the Ethernet-switching MAC address table for the intended VLAN and interfaces. Which corrective approach most directly addresses the original issue?

  1. Configure a supported filter-based VLAN assignment policy for the intended traffic classes.
  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. Place the hosts in an appropriate private VLAN community association.

Explanation

Correct Answer

A:

This corrective choice addresses Filter-based VLAN selection. Matching traffic can be associated with the VLAN selected by the filter criteria.

Incorrect Answers

B:

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

C:

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

D:

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

Question 408

An enterprise network designer recommends: Configure a supported filter-based VLAN assignment policy for the intended traffic classes. 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 switched access design requires ingress frames to be assigned to VLANs according to a supported classification filter rather than a static port-only choice.
  3. A cluster of related hosts should communicate with each other but remain segregated from hosts assigned to other private VLAN communities.
  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

B:

This case requires the Filter-based VLAN selection action. Matching traffic can be associated with the VLAN selected by the filter criteria.

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

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 409

Hosts in two separate VLANs require routed IP communication through a Junos switch instead of only Layer 2 bridging. 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. Configure routed IRB interfaces and associated VLAN gateway bindings.
  3. Connect the permitted gateway using the private VLAN promiscuous-port role.
  4. Use the supported private VLAN isolated-port behavior with a suitable promiscuous uplink.

Explanation

Correct Answer

B:

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

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 IRB L3 gateway requirement.

C:

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 IRB L3 gateway requirement.

D:

That action targets Private VLAN isolation: Isolated hosts can reach permitted upstream services without communicating directly with each other. It does not directly resolve the stated IRB L3 gateway requirement.

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.

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