What type of routing does ECS use for network separation?

Question

Options

• ASource-based
• BSource-based and target-based
• CTarget-based
• DProtocol-based

• A
  93% (26)
• B
  4% (1)
• D
  4% (1)

Explanation

ECS uses source-based routing to achieve network separation because it makes forwarding decisions based on the originating interface or source address of the traffic. This allows different logical networks to remain isolated from one another - traffic entering from one source (e.g., one segment or VRF) follows a distinct routing path and never bleeds into another segment's table.

Why the distractors are wrong:

• B (Source-based and target-based): Network separation in ECS relies solely on the source; adding destination-based logic into the mix would describe a policy-based routing hybrid, not ECS's specific mechanism.
• C (Target-based): Standard destination-based routing is the default for most IP networks, but it cannot enforce separation on its own - two segments could share routes to the same destination without isolation.
• D (Protocol-based): Routing by protocol (e.g., TCP vs. UDP) governs traffic type handling, not network segmentation; it doesn't create logically separate routing domains.

Memory tip: Think of source as "who you are" - ECS asks where you came from to decide which network you belong to, keeping different sources in their own lane. The phrase "Source = Separation" can help you lock this in on exam day.

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