Title: Quiz 5 — AWS Bedrock, Google Vertex AI, and OpenRouter Routing
Course: AIINFRA 300: Agentic AI & the Model Context Protocol (MCP) > Section: Week 05 — AWS Bedrock, Google Vertex AI, and OpenRouter Routing

Q: What authentication mechanism does Amazon Bedrock use for API requests?
- A single OpenAI-style bearer token
- AWS SigV4 request signing via IAM
- A Google service-account credential
- No authentication is required within a VPC
A: AWS SigV4 request signing via IAM

Q: If a foundation model is available on Bedrock in one AWS region, it is automatically available in every other AWS region under the same account.
- True
- False
A: False

Q: Which AWS region currently has the broadest default model availability on Bedrock?
- us-east-1
- eu-west-1
- us-west-2
- ap-southeast-1
A: us-west-2

Q: Name two agent-loop frameworks (besides Google ADK) that can run inside a Bedrock AgentCore-scaffolded agent.
Feedback: Sample/expected answer: Any two of: Strands, LangGraph, OpenAI Agents (SDK)

Q: On OpenRouter, which routing suffix should you append to a model slug to prioritize the cheapest available endpoint?
- `:nitro`
- `:floor`
- `:exacto`
- `:secure`
A: `:floor`

Q: Specifying a base provider slug on OpenRouter (e.g., google-vertex) always routes your request to one specific, fixed endpoint and region.
- True
- False
A: False

Q: A developer's Bedrock InvokeModel call returns a 403 Forbidden error for a model they believe should exist. What is the most likely cause?
- The model does not exist anywhere on AWS
- The model has not been explicitly enabled for that account/region in Bedrock's Model Access settings
- Bedrock does not support 403 errors
- The request must be resent using an OpenAI-style bearer key instead
A: The model has not been explicitly enabled for that account/region in Bedrock's Model Access settings

Q: What class of tool (give one example product) sits in front of Bedrock, Vertex AI, and OpenRouter to add automatic retry/fallback, quota management, and audit logging across all three providers?
Feedback: Sample/expected answer: A multi-provider gateway, e.g., LiteLLM or Bifrost