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Question 28 - JN0-683 discussion

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You are deploying an IP fabric with an oversubscription ratio of 3:1.

In this scenario, which two statements are correct? (Choose two.)

A.
The oversubscription ratio decreases when you add leaf devices.
Answers
A.
The oversubscription ratio decreases when you add leaf devices.
B.
The oversubscription ratio remains the same when you remove leaf devices.
Answers
B.
The oversubscription ratio remains the same when you remove leaf devices.
C.
The oversubscription ratio increases when you remove leaf devices.
Answers
C.
The oversubscription ratio increases when you remove leaf devices.
D.
The oversubscription ratio remains the same when you add leaf devices.
Answers
D.
The oversubscription ratio remains the same when you add leaf devices.
Suggested answer: C, D

Explanation:

Understanding Oversubscription Ratio in IP Fabrics:

The oversubscription ratio in an IP fabric typically refers to the ratio of the available bandwidth at the edge of the network (leaves) to the available bandwidth at the core or spine. A 3:1 oversubscription ratio means that for every 3 units of bandwidth at the leaves, there is 1 unit of bandwidth at the spine.

Impact of Adding or Removing Leaf Devices:

Removing Leaf Devices: When you remove leaf devices, the amount of total edge bandwidth decreases while the bandwidth in the spine remains constant. This causes the oversubscription ratio to increase because there is now less total bandwidth to distribute across the same amount of spine bandwidth.

Adding Leaf Devices: Conversely, when you add leaf devices, the total edge bandwidth increases. Since the spine bandwidth remains the same, the oversubscription ratio would remain the same if the additional leaves consume their share of the available bandwidth proportionally.

Conclusion:

Option C: Correct---Removing leaf devices increases the oversubscription ratio.

Option D: Correct---Adding leaf devices typically maintains the oversubscription ratio assuming uniform bandwidth distribution.

asked 18/09/2024
Babatunde Ipaye
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