JNCIE-SP: Juniper Networks Certified Expert – Service Provider (2021) — Question 2

Your data center uses a Virtual Chassis Fabric. The ToR switches have 48 ports and each rack supports 20 servers. Each server has two ports that are configured as a LAG.
You need to implement link level redundancy but you cannot use two ports on the same device for this redundancy.
Which type of connection should you use to complete this task?

Answer options

• A. MC-LAG
• B. RTG
• C. LAG
• D. ESI

Correct answer: C

Explanation

The correct answer is C, as a LAG (Link Aggregation Group) allows for link redundancy through the aggregation of multiple links into a single logical link, as long as they are not from the same device. Options A, B, and D do not provide the required redundancy within these constraints, as MC-LAG and ESI involve configurations that may include multiple ports from the same device, which is not permitted in this scenario.