How a service mesh enables automatic mTLS
WHAT IT TESTS: identity and the data-plane handshake. OUTLINE: the control plane issues short-lived workload certificates, sidecars present them, both sides verify identity and encrypt the channel.
WHAT IT TESTS: how meshes provide encryption plus mutual authentication transparently. ANSWER OUTLINE: the control plane acts as a certificate authority and provisions each workload a short-lived identity certificate tied to its service account. When service A calls B, A's sidecar opens a TLS connection to B's sidecar; each presents its cert, both verify against the mesh CA and check the peer's identity, then traffic flows encrypted.
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