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Exam Code: JN0-650

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

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

Questions & Answers

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Juniper JN0-650 Practice Test 45

Question 440

An enterprise network designer recommends: Verify end-to-end MVRP participation and VLAN registration behavior on the intermediate switch. Which situation most clearly calls for this action?

  1. An operator wants dynamic VLAN advertisements to remain limited to a specific subset of participating switching links.
  2. Two trunks form an intermediate switching path but dynamically learned VLANs are available only on the first link.
  3. A VLAN never appears dynamically on a neighboring switch because one end has no MVRP support or participation.
  4. A previously available dynamic VLAN disappears after an uplink topology change and administrators must check its source.

Explanation

Correct Answer

B:

This case requires the MVRP propagation troubleshooting action. The operator can locate where the dynamic VLAN registration stops propagating.

Incorrect Answers

A:

This other case would be better matched to Enable MVRP only on intended eligible trunks and bound the propagation design. Dynamic VLAN registration does not need to extend across every physical link.

C:

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.

D:

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.

Question 441

A service provider must transport a customer's existing 802.1Q VLAN tags over a shared metro Ethernet backbone. Which Junos networking action or protocol decision best addresses this requirement?

  1. Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.
  2. Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge.
  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 action addresses Provider VLAN stacking. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

Incorrect Answers

A:

That action targets Q-in-Q overhead MTU: The provider path can accommodate the larger encapsulated Ethernet frames. It does not directly resolve the stated Provider VLAN stacking requirement.

C:

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 Provider VLAN stacking requirement.

D:

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 Provider VLAN stacking requirement.

Question 442

A Junos network engineer takes this step: Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge. Which outcome most directly follows?

  1. The provider path can accommodate the larger encapsulated Ethernet frames.
  2. The far-end customer can continue to classify traffic by its original VLAN 37 tag.
  3. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.
  4. Selected customer control packets can traverse the provider transport as tunneled traffic.

Explanation

Correct Answer

C:

This is the direct result of the Provider VLAN stacking decision: Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

Incorrect Answers

A:

This outcome is associated with Q-in-Q overhead MTU (Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.), not the specified action.

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.

D:

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.

Question 443

A service provider must transport a customer's existing 802.1Q VLAN tags over a shared metro Ethernet backbone. A colleague instead suggests: Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel. Which corrective approach most directly addresses the original issue?

  1. Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.
  2. Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel.
  3. Use supported Layer 2 protocol tunneling for the intended control-frame type.
  4. Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge.

Explanation

Correct Answer

D:

This corrective choice addresses Provider VLAN stacking. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

Incorrect Answers

A:

That alternative applies to Q-in-Q overhead MTU instead. The provider path can accommodate the larger encapsulated Ethernet frames.

B:

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

C:

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

Question 444

An enterprise network designer recommends: Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge. Which situation most clearly calls for this action?

  1. A service provider must transport a customer's existing 802.1Q VLAN tags over a shared metro Ethernet backbone.
  2. Two campus segments require selected Layer 2 protocol control frames to traverse a provider bridging service without terminating locally at the provider edge.
  3. A transported Ethernet service works for small frames but drops large packets when stacked VLAN tags increase frame length.
  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 Provider VLAN stacking action. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

Incorrect Answers

B:

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.

C:

This other case would be better matched to Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU. The provider path can accommodate the larger encapsulated Ethernet frames.

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 445

Frames in an Ethernet transport service have a customer VLAN tag and require a separate provider tag for network segmentation. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use supported Layer 2 protocol tunneling for the intended control-frame type.
  2. Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.
  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

C:

This action addresses Outer service tag. The provider network can distinguish services without rewriting each customer's local VLAN number.

Incorrect Answers

A:

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 Outer service tag requirement.

B:

That action targets Q-in-Q overhead MTU: The provider path can accommodate the larger encapsulated Ethernet frames. It does not directly resolve the stated Outer service tag requirement.

D:

That action targets Q-in-Q service separation: Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic. It does not directly resolve the stated Outer service tag requirement.

Question 446

A Junos network engineer takes this step: Add an appropriate outer service tag while retaining the inner customer tag. Which outcome most directly follows?

  1. The provider path can accommodate the larger encapsulated Ethernet frames.
  2. Selected customer control packets can traverse the provider transport as tunneled traffic.
  3. Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.
  4. The provider network can distinguish services without rewriting each customer's local VLAN number.

Explanation

Correct Answer

D:

This is the direct result of the Outer service tag decision: The provider network can distinguish services without rewriting each customer's local VLAN number.

Incorrect Answers

A:

This outcome is associated with Q-in-Q overhead MTU (Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.), not the specified action.

B:

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.

C:

This outcome is associated with Q-in-Q service separation (Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit.), not the specified action.

Question 447

Frames in an Ethernet transport service have a customer VLAN tag and require a separate provider tag for network segmentation. A colleague instead suggests: Use supported Layer 2 protocol tunneling for the intended control-frame type. Which corrective approach most directly addresses the original issue?

  1. Add an appropriate outer service tag while retaining the inner customer tag.
  2. Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.
  3. Use supported Layer 2 protocol tunneling for the intended control-frame type.
  4. Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit.

Explanation

Correct Answer

A:

This corrective choice addresses Outer service tag. The provider network can distinguish services without rewriting each customer's local VLAN number.

Incorrect Answers

B:

That alternative applies to Q-in-Q overhead MTU instead. The provider path can accommodate the larger encapsulated Ethernet frames.

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

Question 448

An enterprise network designer recommends: Add an appropriate outer service tag while retaining the inner customer tag. 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. 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

B:

This case requires the Outer service tag action. The provider network can distinguish services without rewriting each customer's local VLAN number.

Incorrect Answers

A:

This other case would be better matched to Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU. The provider path can accommodate the larger encapsulated Ethernet frames.

C:

This other case would be better matched to Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit. Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.

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 449

A customer uses VLAN 37 and needs that original VLAN identifier to survive passage through a Q-in-Q transport network. Which Junos networking action or protocol decision best addresses this requirement?

  1. Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit.
  2. Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge.
  3. Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel.
  4. Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.

Explanation

Correct Answer

C:

This action addresses Inner customer tag. The far-end customer can continue to classify traffic by its original VLAN 37 tag.

Incorrect Answers

A:

That action targets Q-in-Q service separation: Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic. It does not directly resolve the stated Inner customer tag requirement.

B:

That action targets Provider VLAN stacking: Customer VLAN identifiers can be preserved inside a provider service VLAN tag. It does not directly resolve the stated Inner customer tag requirement.

D:

That action targets Q-in-Q overhead MTU: The provider path can accommodate the larger encapsulated Ethernet frames. It does not directly resolve the stated Inner customer tag requirement.

Question 450

A Junos network engineer takes this step: Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel. Which outcome most directly follows?

  1. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.
  2. The provider path can accommodate the larger encapsulated Ethernet frames.
  3. Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.
  4. The far-end customer can continue to classify traffic by its original VLAN 37 tag.

Explanation

Correct Answer

D:

This is the direct result of the Inner customer tag decision: The far-end customer can continue to classify traffic by its original VLAN 37 tag.

Incorrect Answers

A:

This outcome is associated with Provider VLAN stacking (Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge.), not the specified action.

B:

This outcome is associated with Q-in-Q overhead MTU (Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.), not the specified action.

C:

This outcome is associated with Q-in-Q service separation (Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit.), not the specified action.

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