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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 46

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.

Question 451

A customer uses VLAN 37 and needs that original VLAN identifier to survive passage through a Q-in-Q transport network. A colleague instead suggests: Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

That alternative applies to Provider VLAN stacking instead. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

C:

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

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 452

An enterprise network designer recommends: Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel. Which situation most clearly calls for this action?

  1. Two customer organizations both use internal VLAN 10 yet must remain isolated over a shared L2 provider core.
  2. A customer uses VLAN 37 and needs that original VLAN identifier to survive passage through a Q-in-Q transport network.
  3. A transported Ethernet service works for small frames but drops large packets when stacked VLAN tags increase frame length.
  4. A service provider must transport a customer's existing 802.1Q VLAN tags over a shared metro Ethernet backbone.

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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.

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 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.

Question 453

Two campus segments require selected Layer 2 protocol control frames to traverse a provider bridging service without terminating locally at the provider edge. 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 Layer 2 protocol tunneling for the intended control-frame type.
  3. Add an appropriate outer service tag while retaining the inner customer tag.
  4. Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge.

Explanation

Correct Answer

B:

This action addresses Layer 2 BPDU tunnel. Selected customer control packets can traverse the provider transport as tunneled traffic.

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 Layer 2 BPDU tunnel 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 Layer 2 BPDU tunnel requirement.

D:

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 Layer 2 BPDU tunnel requirement.

Question 454

A Junos network engineer takes this step: Use supported Layer 2 protocol tunneling for the intended control-frame type. Which outcome most directly follows?

  1. Identical inner customer VLAN identifiers can be carried without mixing the two customers' traffic.
  2. Customer VLAN identifiers can be preserved inside a provider service VLAN 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

C:

This is the direct result of the Layer 2 BPDU tunnel decision: Selected customer control packets can traverse the provider transport as tunneled traffic.

Incorrect Answers

A:

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.

B:

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.

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 455

Two campus segments require selected Layer 2 protocol control frames to traverse a provider bridging service without terminating locally at the provider edge. A colleague instead suggests: Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit. Which corrective approach most directly addresses the original issue?

  1. Assign distinct outer service VLAN tags or equivalent service separation to each customer circuit.
  2. Add an appropriate outer service tag while retaining the inner customer tag.
  3. Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge.
  4. Use supported Layer 2 protocol tunneling for the intended control-frame type.

Explanation

Correct Answer

D:

This corrective choice addresses Layer 2 BPDU tunnel. Selected customer control packets can traverse the provider transport as tunneled traffic.

Incorrect Answers

A:

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

B:

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 Provider VLAN stacking instead. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

Question 456

An enterprise network designer recommends: Use supported Layer 2 protocol tunneling for the intended control-frame type. Which situation most clearly calls for this action?

  1. Two campus segments require selected Layer 2 protocol control frames to traverse a provider bridging service without terminating locally at the provider edge.
  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. A service provider must transport a customer's existing 802.1Q VLAN tags over a shared metro Ethernet backbone.

Explanation

Correct Answer

A:

This case requires the Layer 2 BPDU tunnel action. Selected customer control packets can traverse the provider transport as tunneled traffic.

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 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 IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

Question 457

A transported Ethernet service works for small frames but drops large packets when stacked VLAN tags increase frame length. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge.
  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. Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel.

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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 Q-in-Q overhead MTU 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 overhead MTU 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 Q-in-Q overhead MTU requirement.

Question 458

A Junos network engineer takes this step: Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU. Which outcome most directly follows?

  1. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.
  2. The provider network can distinguish services without rewriting each customer's local VLAN number.
  3. The provider path can accommodate the larger encapsulated Ethernet frames.
  4. The far-end customer can continue to classify traffic by its original VLAN 37 tag.

Explanation

Correct Answer

C:

This is the direct result of the Q-in-Q overhead MTU decision: The provider path can accommodate the larger encapsulated Ethernet frames.

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 Outer service tag (Add an appropriate outer service tag while retaining the inner customer tag.), not the specified action.

D:

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

Question 459

A transported Ethernet service works for small frames but drops large packets when stacked VLAN tags increase frame length. A colleague instead suggests: Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge. Which corrective approach most directly addresses the original issue?

  1. Preserve the customer-facing inner 802.1Q tag throughout the supported tunnel.
  2. Add an appropriate outer service tag while retaining the inner customer tag.
  3. Use supported IEEE 802.1ad Q-in-Q VLAN stacking at the provider edge.
  4. Account for added Q-in-Q tag overhead and configure an adequate supported interface MTU.

Explanation

Correct Answer

D:

This corrective choice addresses Q-in-Q overhead MTU. The provider path can accommodate the larger encapsulated Ethernet frames.

Incorrect Answers

A:

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

B:

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 Provider VLAN stacking instead. Customer VLAN identifiers can be preserved inside a provider service VLAN tag.

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.

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