Consul 1.15 Service Mesh With Consul Connect Practice Question
Which protocol is used for the control plane communication between the Consul agent and the sidecar proxy?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
gRPC
The Consul agent communicates with the sidecar proxy (Envoy) using the Envoy xDS API.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Consul RPC
Why it's wrong here
Consul RPC is internal to Consul, not used for proxy config.
- ✗
REST
Why it's wrong here
REST is not the primary mechanism for xDS.
- ✓
gRPC
Why this is correct
Consul uses the gRPC-based xDS API to push configuration to Envoy.
- ✗
HTTP/1.1
Why it's wrong here
xDS is gRPC-based.
About these practice questions
Courseiva writes every Consul 1.15 question from scratch — 194 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official HashiCorp exam blueprint
This Consul 1.15 practice question is part of Courseiva's free HashiCorp certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the Consul 1.15 exam.