A default CA certificate for TLS is provided to verify the certificate that the Extreme 9920 device issues. All gNMI requests to the device are over a secure channel. The Extreme 9920 uses the default HTTPS server certificate if you do not import an HTTPS server certificate.
-----BEGIN CERTIFICATE----- MIIGPjCCBCagAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwgbMxCzAJBgNVBAYTAlVT MQswCQYDVQQIDAJDQTELMAkGA1UEBwwCU0oxGTAXBgNVBAoMEEV4dHJlbWUgTmV0 d29ya3MxHzAdBgNVBAsMFkV4dHJlbWUgTmV0d29ya3MgTkdOUEIxIjAgBgNVBAMM GW5nbnBiLmV4dHJlbWVuZXR3b3Jrcy5jb20xKjAoBgkqhkiG9w0BCQEWG3N1cHBv cnRAZXh0cmVtZW5ldHdvcmtzLmNvbTAeFw0yMDA3MDcyMTEzNDNaFw0zMDA3MDUy MTEzNDNaMIGnMQswCQYDVQQGEwJVUzELMAkGA1UECAwCQ0ExGTAXBgNVBAoMEEV4 dHJlbWUgTmV0d29ya3MxJDAiBgNVBAsMG0V4dHJlbWUgTmV0d29ya3MgTmV4dEdl bk5QQjEeMBwGA1UEAwwVTkdOUEIgSW50ZXJtZWRpYXRlIENBMSowKAYJKoZIhvcN AQkBFhtzdXBwb3J0QGV4dHJlbWVuZXR3b3Jrcy5jb20wggIiMA0GCSqGSIb3DQEB AQUAA4ICDwAwggIKAoICAQC64lUkRcEvz+jWfm9V9+g/AgZFpDOKL5oR4c3IHdwM vAA6Rt+Os+6wvOpLysDvzggeVh4L6BWULgFw5SyRhjKJbyz7PaMBg/id5XPqWntU 3MoPOdewdVozyZZf3MRDVqgw8f7nT4Ex55fSnfyYLOx5g2++rUUK3jpQo74vRI/W SUZdOAvs9hkERcMJIm4DDcj86Z4HuYaB/iBBSqPDhRoErpaX36TOWY+2wCNomkK1 zzCO9PW3HhfZk+GWF10U/7ZkNOBMnd5nVIalf+VsSpaPzQxAJtIKS1xYqmoACW6s S/myGEPuDqmYhilwSgP+lyRmpkGZEfPbwxZyrhxUAnwQ0+r8HUSvBRavK+utt+JQ SeFiPPVeo6OoGgwRJ1t9KVid+Sp56+gwMj27Kf26cWYUJsjjHxyJgFFCforcn40M Kox5idbZkQjdo7ciofK7Twz8U+ip/lyhbycUcz7cG7vimRvu+BpyJ29zL7It/PZX U8fP3r0ssudasfwZGxl3AO58szhopE0m4eaIQzhotqwqXt6s8Vh/+qj6JMudMxa6 5HVeBVX6BEvLG8TwKaaQiJ4edwI/QY0WZ0wxfeDn05haSiyOhRkmA/F9cqv3h8qM B5+IZ+nYNpjASyxc1QTtW9Xhn37vp61+7JddU9zxeSVkB43YGOK9Uq1+DXDawlzA 5wIDAQABo2YwZDAdBgNVHQ4EFgQU2Sn6JG7Jo3QzMRBsLHhQkVW8uzQwHwYDVR0j BBgwFoAUuwS1PNyE3M192izM7zaoJm1vhTQwEgYDVR0TAQH/BAgwBgEB/wIBADAO BgNVHQ8BAf8EBAMCAYYwDQYJKoZIhvcNAQELBQADggIBAKRIQfsZiiIVZC3jCmBt cwf3LRN2ESOy8bj4AV0LxgchjMtw/y/Dp7ST5FkUEIAya8HEmL1tjZhHFh0uNfBx 7UcRV2R7ZhGu08TujFbo9sVy2GHd+w1/L6VDauEjV6eUd4oI6kylcDK/OA3UoYwF vbiiLlDYEFaP3/3MFaqk9osfmkxcmhu3qxOt3QxqevXPiXtXlNxT4w/LrQFXKMcJ 40zjFjgnNsdYlr92c2kwWDE/44xnOWEH7Ar2PuqvqHJi1GFv1lV/Ys+0wkqCyy/K eAdde8d8ZWcXroSHzlGI34Tql2U9+bZjxNgU9Nc8VJGq+K9LBDTQqFfGg0n9qHYE eCGGzw5eT+lJMSVompRPEHt44qCk5eKRmEWsMbgeD8d6cisPE4PffIynSV/evjsY k9gaE0d86uhN5EuNQsqtLn5vsdWN8nBBP+umPLtHpppHATAGSWgW8WGgSLs8gBwS IABCVCpV7oePXN0LCfzRTd2JwCmUpqxreGw3cuePDMNimOQvwnaAvLfNxFYSoRtp wU8VGdAUQJxqkeS4xlkpKbOYGGHlntlskSP7VuygLn2ISa3v6xTRLlaTDcLuiu+K vNGwM33rgKUiPtDFM9oK0CtiydM1TqfQZB3/B1a3RzqX2OmBvR6qB9M5jeNQXd+T wa/daP9p2G6/lcNRE+AiCpul -----END CERTIFICATE-----