Microsoft Azure Fundamentals — Question 263

At which OSI layer does ExpressRoute operate?

Answer options

• A. Layer 2
• B. Layer 3
• C. Layer 5
• D. Layer 7

Correct answer: B

Explanation

ExpressRoute functions at Layer 3 of the OSI model, which is responsible for routing and forwarding data packets. The other layers mentioned, such as Layer 2 (data link), Layer 5 (session), and Layer 7 (application), do not pertain to the primary operations of ExpressRoute.