diff --git a/blog-training-data/blog-106-fiber-diagnostics-eye-diagrams.md b/blog-training-data/blog-106-fiber-diagnostics-eye-diagrams.md
index f6b7be0..cb9f0a3 100644
--- a/blog-training-data/blog-106-fiber-diagnostics-eye-diagrams.md
+++ b/blog-training-data/blog-106-fiber-diagnostics-eye-diagrams.md
@@ -209,7 +209,9 @@ Different failure modes leave distinct signatures in the eye diagram. Learn to s
 from arista.api import eapi
 
 def monitor_eye_diagram(switch_ip, port):
-    client = eapi.connect(host=switch_ip, username="<USER>", password="<PASSWORD>")
+    # Read credentials from environment (never hard-code)
+    creds = load_credentials_from_env("ARISTA")  # returns dict suitable for **kwargs
+    client = eapi.connect(host=switch_ip, **creds)
     result = client.runCmds(1, [f"show interfaces Ethernet {port} transceiver eye-diagram"], format="json")
     data = result['result'][0]
     return {
@@ -224,7 +226,8 @@ def monitor_eye_diagram(switch_ip, port):
 from ncclient import manager
 
 def monitor_eye_diagram_cisco(switch_ip, port):
-    m = manager.connect(host=switch_ip, username="<USER>", password="<PASSWORD>", hostkey_verify=False)
+    creds = load_credentials_from_env("CISCO")  # username + secret from env
+    m = manager.connect(host=switch_ip, **creds, hostkey_verify=False)
     filter_spec = f'<transceiver><port>{port}</port></transceiver>'
     result = m.get(filter=('xpath', filter_spec))
     # Parse result for eye diagram metrics