[Solved] Why does Docker Swarm use VXLAN encapsulation in overlay networks? — Ans: To encapsulate Layer 2 Ethernet frames inside Layer 3 UDP packets for... | Docker

Docker - Swarm

Why does Docker Swarm use VXLAN encapsulation in overlay networks?

ATo encapsulate Layer 2 Ethernet frames inside Layer 3 UDP packets for cross-host communication.

BTo encrypt all network traffic by default.

CTo assign static IP addresses to containers.

DTo limit network traffic to a single host.

Step-by-Step Solution

Solution:

Step 1: Understand VXLAN purpose in overlay networks
VXLAN encapsulates Layer 2 frames inside UDP packets to allow Layer 2 networks over Layer 3 infrastructure.
Step 2: Analyze options
To encapsulate Layer 2 Ethernet frames inside Layer 3 UDP packets for cross-host communication. correctly describes VXLAN encapsulation. To encrypt all network traffic by default. is incorrect; VXLAN itself does not encrypt. To assign static IP addresses to containers. is unrelated. To limit network traffic to a single host. is false.
Final Answer:
To encapsulate Layer 2 Ethernet frames inside Layer 3 UDP packets for cross-host communication. -> Option A
Quick Check:
VXLAN = Layer 2 over Layer 3 encapsulation [OK]

Quick Trick: VXLAN encapsulates Layer 2 frames in UDP for cross-host networking [OK]

Common Mistakes:

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