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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 47

Question 460

An enterprise network designer recommends: Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU. Which situation most clearly calls for this action?

  1. A transported Ethernet service works for small frames but drops large packets when stacked VLAN tags increase frame length.
  2. Frames in an Ethernet transport service have a customer VLAN tag and require a separate provider tag for network segmentation.
  3. A service provider must transport a customer's existing 802.1Q VLAN tags over a shared metro Ethernet backbone.
  4. A customer uses VLAN 37 and needs that original VLAN identifier to survive passage through a Q-in-Q transport network.

Explanation

Correct Answer

A:

This case requires the Q-in-Q overhead MTU action. The provider path can accommodate the larger encapsulated Ethernet frames.

Incorrect Answers

B:

This other case would be better matched to Add an appropriate outer service tag while retaining the inner customer tag. The provider network can distinguish services without rewriting each customer's local VLAN number.

C:

This other case would be better matched to Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

D:

This other case would be better matched to Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel. The far-end customer can continue to classify traffic by its original VLAN 37 tag.

Question 461

Two customer organizations both use internal VLAN 10 yet must remain isolated over a shared L2 provider core. Which Junos networking action or protocol decision best addresses this requirement?

  1. Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel.
  2. Use supported Layer 2 protocol tunneling for the intended control-frame type.
  3. Add an appropriate outer service tag while retaining the inner customer tag.
  4. Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit.

Explanation

Correct Answer

D:

This action addresses Q-in-Q service separation. Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.

Incorrect Answers

A:

That action targets Inner customer tag: The far-end customer can continue to classify traffic by its original VLAN 37 tag. It does not directly resolve the stated Q-in-Q service separation requirement.

B:

That action targets Layer 2 BPDU tunnel: Selected customer control packets can traverse the provider transport as tunneled traffic. It does not directly resolve the stated Q-in-Q service separation requirement.

C:

That action targets Outer service tag: The provider network can distinguish services without rewriting each customer's local VLAN number. It does not directly resolve the stated Q-in-Q service separation requirement.

Question 462

A Junos network engineer takes this step: Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit. Which outcome most directly follows?

  1. Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.
  2. The far-end customer can continue to classify traffic by its original VLAN 37 tag.
  3. Selected customer control packets can traverse the provider transport as tunneled traffic.
  4. The provider network can distinguish services without rewriting each customer's local VLAN number.

Explanation

Correct Answer

A:

This is the direct result of the Q-in-Q service separation decision: Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.

Incorrect Answers

B:

This outcome is associated with Inner customer tag (Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel.), not the specified action.

C:

This outcome is associated with Layer 2 BPDU tunnel (Use supported Layer 2 protocol tunneling for the intended control-frame type.), not the specified action.

D:

This outcome is associated with Outer service tag (Add an appropriate outer service tag while retaining the inner customer tag.), not the specified action.

Question 463

Two customer organizations both use internal VLAN 10 yet must remain isolated over a shared L2 provider core. A colleague instead suggests: Add an appropriate outer service tag while retaining the inner customer tag. Which corrective approach most directly addresses the original issue?

  1. Add an appropriate outer service tag while retaining the inner customer tag.
  2. Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit.
  3. Use supported Layer 2 protocol tunneling for the intended control-frame type.
  4. Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel.

Explanation

Correct Answer

B:

This corrective choice addresses Q-in-Q service separation. Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.

Incorrect Answers

A:

That alternative applies to Outer service tag instead. The provider network can distinguish services without rewriting each customer's local VLAN number.

C:

That alternative applies to Layer 2 BPDU tunnel instead. Selected customer control packets can traverse the provider transport as tunneled traffic.

D:

That alternative applies to Inner customer tag instead. The far-end customer can continue to classify traffic by its original VLAN 37 tag.

Question 464

An enterprise network designer recommends: Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit. Which situation most clearly calls for this action?

  1. A customer uses VLAN 37 and needs that original VLAN identifier to survive passage through a Q-in-Q transport network.
  2. Frames in an Ethernet transport service have a customer VLAN tag and require a separate provider tag for network segmentation.
  3. Two customer organizations both use internal VLAN 10 yet must remain isolated over a shared L2 provider core.
  4. Two campus segments require selected Layer 2 protocol control frames to traverse a provider bridging service without terminating locally at the provider edge.

Explanation

Correct Answer

C:

This case requires the Q-in-Q service separation action. Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.

Incorrect Answers

A:

This other case would be better matched to Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel. The far-end customer can continue to classify traffic by its original VLAN 37 tag.

B:

This other case would be better matched to Add an appropriate outer service tag while retaining the inner customer tag. The provider network can distinguish services without rewriting each customer's local VLAN number.

D:

This other case would be better matched to Use supported Layer 2 protocol tunneling for the intended control-frame type. Selected customer control packets can traverse the provider transport as tunneled traffic.

Question 465

Three switches are intended to form one MSTP region but one switch uses a different region revision and behaves as a boundary. Which Junos networking action or protocol decision best addresses this requirement?

  1. Map the VLANs to appropriate separate MST instances in the common region configuration.
  2. Align the MST region name, revision and VLAN-to-instance mapping across the members.
  3. Tune the appropriate MSTP port cost to represent the desired physical path preference.
  4. Inspect MSTP instance root, interface roles, path costs and port states.

Explanation

Correct Answer

B:

This action addresses MSTP region consistency. The devices can recognize matching MSTP configuration identifiers and join the same region.

Incorrect Answers

A:

That action targets MSTP instance VLAN map: Different VLAN groups can follow independently optimized instance trees. It does not directly resolve the stated MSTP region consistency requirement.

C:

That action targets MSTP path cost: Spanning-tree can favor the intended lower-cost root path. It does not directly resolve the stated MSTP region consistency requirement.

D:

That action targets MSTP monitoring: The engineer can determine which port is root, designated, or alternate for the instance. It does not directly resolve the stated MSTP region consistency requirement.

Question 466

A Junos network engineer takes this step: Align the MST region name, revision and VLAN-to-instance mapping across the members. Which outcome most directly follows?

  1. Spanning-tree can favor the intended lower-cost root path.
  2. Different VLAN groups can follow independently optimized instance trees.
  3. The devices can recognize matching MSTP configuration identifiers and join the same region.
  4. The engineer can determine which port is root, designated, or alternate for the instance.

Explanation

Correct Answer

C:

This is the direct result of the MSTP region consistency decision: The devices can recognize matching MSTP configuration identifiers and join the same region.

Incorrect Answers

A:

This outcome is associated with MSTP path cost (Tune the appropriate MSTP port cost to represent the desired physical path preference.), not the specified action.

B:

This outcome is associated with MSTP instance VLAN map (Map the VLANs to appropriate separate MST instances in the common region configuration.), not the specified action.

D:

This outcome is associated with MSTP monitoring (Inspect MSTP instance root, interface roles, path costs and port states.), not the specified action.

Question 467

Three switches are intended to form one MSTP region but one switch uses a different region revision and behaves as a boundary. A colleague instead suggests: Tune the appropriate MSTP port cost to represent the desired physical path preference. Which corrective approach most directly addresses the original issue?

  1. Inspect MSTP instance root, interface roles, path costs and port states.
  2. Tune the appropriate MSTP port cost to represent the desired physical path preference.
  3. Map the VLANs to appropriate separate MST instances in the common region configuration.
  4. Align the MST region name, revision and VLAN-to-instance mapping across the members.

Explanation

Correct Answer

D:

This corrective choice addresses MSTP region consistency. The devices can recognize matching MSTP configuration identifiers and join the same region.

Incorrect Answers

A:

That alternative applies to MSTP monitoring instead. The engineer can determine which port is root, designated, or alternate for the instance.

B:

That alternative applies to MSTP path cost instead. Spanning-tree can favor the intended lower-cost root path.

C:

That alternative applies to MSTP instance VLAN map instead. Different VLAN groups can follow independently optimized instance trees.

Question 468

An enterprise network designer recommends: Align the MST region name, revision and VLAN-to-instance mapping across the members. Which situation most clearly calls for this action?

  1. Three switches are intended to form one MSTP region but one switch uses a different region revision and behaves as a boundary.
  2. A redundant uplink is discarding frames and network operations must know whether the state is normal spanning-tree behavior.
  3. A blocked redundant path is unexpectedly chosen as the preferred forwarding link because its spanning-tree cost is too low.
  4. VLAN 100 should use a different spanning-tree forwarding topology than VLAN 200, but both map to one MST instance.

Explanation

Correct Answer

A:

This case requires the MSTP region consistency action. The devices can recognize matching MSTP configuration identifiers and join the same region.

Incorrect Answers

B:

This other case would be better matched to Inspect MSTP instance root, interface roles, path costs and port states. The engineer can determine which port is root, designated, or alternate for the instance.

C:

This other case would be better matched to Tune the appropriate MSTP port cost to represent the desired physical path preference. Spanning-tree can favor the intended lower-cost root path.

D:

This other case would be better matched to Map the VLANs to appropriate separate MST instances in the common region configuration. Different VLAN groups can follow independently optimized instance trees.

Question 469

The wrong distribution switch becomes the spanning-tree root for a critical MST instance after a topology expansion. Which Junos networking action or protocol decision best addresses this requirement?

  1. Allow MSTP reconvergence to transition the eligible alternate path according to its state machine.
  2. Compare the VLAN-to-instance map and region attributes for exact consistency.
  3. Assign an appropriate lower bridge priority to the intended root for that instance.
  4. Rely on MSTP alternate or discarding port roles to block the redundant active path.

Explanation

Correct Answer

C:

This action addresses MSTP root election. MSTP root bridge election can select the designated distribution switch.

Incorrect Answers

A:

That action targets MSTP topology change: The switched network can restore Layer 2 connectivity on a loop-free replacement path. It does not directly resolve the stated MSTP root election requirement.

B:

That action targets MSTP boundary mismatch: The inconsistent device can be identified and corrected rather than treated as an internal peer. It does not directly resolve the stated MSTP root election requirement.

D:

That action targets MSTP alternate port: The network retains redundancy while avoiding a persistent Layer 2 loop. It does not directly resolve the stated MSTP root election requirement.

Question 470

A Junos network engineer takes this step: Assign an appropriate lower bridge priority to the intended root for that instance. Which outcome most directly follows?

  1. The inconsistent device can be identified and corrected rather than treated as an internal peer.
  2. The switched network can restore Layer 2 connectivity on a loop-free replacement path.
  3. The network retains redundancy while avoiding a persistent Layer 2 loop.
  4. MSTP root bridge election can select the designated distribution switch.

Explanation

Correct Answer

D:

This is the direct result of the MSTP root election decision: MSTP root bridge election can select the designated distribution switch.

Incorrect Answers

A:

This outcome is associated with MSTP boundary mismatch (Compare the VLAN-to-instance map and region attributes for exact consistency.), not the specified action.

B:

This outcome is associated with MSTP topology change (Allow MSTP reconvergence to transition the eligible alternate path according to its state machine.), not the specified action.

C:

This outcome is associated with MSTP alternate port (Rely on MSTP alternate or discarding port roles to block the redundant active path.), not the specified action.

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