diff --git a/test/discovery_and_monitoring/unified/backpressure-network-error-fail-replicaset.json b/test/discovery_and_monitoring/unified/backpressure-network-error-fail-replicaset.json
new file mode 100644
index 0000000000..ccaea8d135
--- /dev/null
+++ b/test/discovery_and_monitoring/unified/backpressure-network-error-fail-replicaset.json
@@ -0,0 +1,142 @@
+{
+  "description": "backpressure-network-error-fail-replicaset",
+  "schemaVersion": "1.17",
+  "runOnRequirements": [
+    {
+      "minServerVersion": "4.4",
+      "serverless": "forbid",
+      "topologies": [
+        "replicaset"
+      ]
+    }
+  ],
+  "createEntities": [
+    {
+      "client": {
+        "id": "setupClient",
+        "useMultipleMongoses": false
+      }
+    }
+  ],
+  "initialData": [
+    {
+      "collectionName": "backpressure-network-error-fail",
+      "databaseName": "sdam-tests",
+      "documents": [
+        {
+          "_id": 1
+        },
+        {
+          "_id": 2
+        }
+      ]
+    }
+  ],
+  "tests": [
+    {
+      "description": "apply backpressure on network connection errors during connection establishment",
+      "operations": [
+        {
+          "name": "createEntities",
+          "object": "testRunner",
+          "arguments": {
+            "entities": [
+              {
+                "client": {
+                  "id": "client",
+                  "useMultipleMongoses": false,
+                  "observeEvents": [
+                    "serverDescriptionChangedEvent",
+                    "poolClearedEvent"
+                  ],
+                  "uriOptions": {
+                    "retryWrites": false,
+                    "heartbeatFrequencyMS": 1000000,
+                    "serverMonitoringMode": "poll",
+                    "appname": "backpressureNetworkErrorFailTest"
+                  }
+                }
+              },
+              {
+                "database": {
+                  "id": "database",
+                  "client": "client",
+                  "databaseName": "sdam-tests"
+                }
+              },
+              {
+                "collection": {
+                  "id": "collection",
+                  "database": "database",
+                  "collectionName": "backpressure-network-error-fail"
+                }
+              }
+            ]
+          }
+        },
+        {
+          "name": "waitForEvent",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client",
+            "event": {
+              "serverDescriptionChangedEvent": {
+                "newDescription": {
+                  "type": "RSPrimary"
+                }
+              }
+            },
+            "count": 1
+          }
+        },
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "setupClient",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": "alwaysOn",
+              "data": {
+                "failCommands": [
+                  "isMaster",
+                  "hello"
+                ],
+                "appName": "backpressureNetworkErrorFailTest",
+                "closeConnection": true
+              }
+            }
+          }
+        },
+        {
+          "name": "insertMany",
+          "object": "collection",
+          "arguments": {
+            "documents": [
+              {
+                "_id": 3
+              },
+              {
+                "_id": 4
+              }
+            ]
+          },
+          "expectError": {
+            "isError": true,
+            "errorLabelsContain": [
+              "SystemOverloadedError",
+              "RetryableError"
+            ]
+          }
+        }
+      ],
+      "expectEvents": [
+        {
+          "client": "client",
+          "eventType": "cmap",
+          "events": []
+        }
+      ]
+    }
+  ]
+}
diff --git a/test/discovery_and_monitoring/unified/backpressure-network-error-fail.json b/test/discovery_and_monitoring/unified/backpressure-network-error-fail-single.json
similarity index 91%
rename from test/discovery_and_monitoring/unified/backpressure-network-error-fail.json
rename to test/discovery_and_monitoring/unified/backpressure-network-error-fail-single.json
index f41b76459c..c1ff67c732 100644
--- a/test/discovery_and_monitoring/unified/backpressure-network-error-fail.json
+++ b/test/discovery_and_monitoring/unified/backpressure-network-error-fail-single.json
@@ -1,14 +1,12 @@
 {
-  "description": "backpressure-network-error-fail",
+  "description": "backpressure-network-error-fail-single",
   "schemaVersion": "1.17",
   "runOnRequirements": [
     {
       "minServerVersion": "4.4",
       "serverless": "forbid",
       "topologies": [
-        "single",
-        "replicaset",
-        "sharded"
+        "single"
       ]
     }
   ],
@@ -48,7 +46,7 @@
                   "id": "client",
                   "useMultipleMongoses": false,
                   "observeEvents": [
-                    "serverHeartbeatSucceededEvent",
+                    "serverDescriptionChangedEvent",
                     "poolClearedEvent"
                   ],
                   "uriOptions": {
@@ -82,7 +80,11 @@
           "arguments": {
             "client": "client",
             "event": {
-              "serverHeartbeatSucceededEvent": {}
+              "serverDescriptionChangedEvent": {
+                "newDescription": {
+                  "type": "Standalone"
+                }
+              }
             },
             "count": 1
           }
diff --git a/test/discovery_and_monitoring/unified/backpressure-network-timeout-fail-replicaset.json b/test/discovery_and_monitoring/unified/backpressure-network-timeout-fail-replicaset.json
new file mode 100644
index 0000000000..35b088f422
--- /dev/null
+++ b/test/discovery_and_monitoring/unified/backpressure-network-timeout-fail-replicaset.json
@@ -0,0 +1,145 @@
+{
+  "description": "backpressure-network-timeout-error-replicaset",
+  "schemaVersion": "1.17",
+  "runOnRequirements": [
+    {
+      "minServerVersion": "4.4",
+      "serverless": "forbid",
+      "topologies": [
+        "replicaset"
+      ]
+    }
+  ],
+  "createEntities": [
+    {
+      "client": {
+        "id": "setupClient",
+        "useMultipleMongoses": false
+      }
+    }
+  ],
+  "initialData": [
+    {
+      "collectionName": "backpressure-network-timeout-error",
+      "databaseName": "sdam-tests",
+      "documents": [
+        {
+          "_id": 1
+        },
+        {
+          "_id": 2
+        }
+      ]
+    }
+  ],
+  "tests": [
+    {
+      "description": "apply backpressure on network timeout error during connection establishment",
+      "operations": [
+        {
+          "name": "createEntities",
+          "object": "testRunner",
+          "arguments": {
+            "entities": [
+              {
+                "client": {
+                  "id": "client",
+                  "useMultipleMongoses": false,
+                  "observeEvents": [
+                    "serverDescriptionChangedEvent",
+                    "poolClearedEvent"
+                  ],
+                  "uriOptions": {
+                    "retryWrites": false,
+                    "heartbeatFrequencyMS": 1000000,
+                    "appname": "backpressureNetworkTimeoutErrorTest",
+                    "serverMonitoringMode": "poll",
+                    "connectTimeoutMS": 250,
+                    "socketTimeoutMS": 250
+                  }
+                }
+              },
+              {
+                "database": {
+                  "id": "database",
+                  "client": "client",
+                  "databaseName": "sdam-tests"
+                }
+              },
+              {
+                "collection": {
+                  "id": "collection",
+                  "database": "database",
+                  "collectionName": "backpressure-network-timeout-error"
+                }
+              }
+            ]
+          }
+        },
+        {
+          "name": "waitForEvent",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client",
+            "event": {
+              "serverDescriptionChangedEvent": {
+                "newDescription": {
+                  "type": "RSPrimary"
+                }
+              }
+            },
+            "count": 1
+          }
+        },
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "setupClient",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": "alwaysOn",
+              "data": {
+                "failCommands": [
+                  "isMaster",
+                  "hello"
+                ],
+                "blockConnection": true,
+                "blockTimeMS": 500,
+                "appName": "backpressureNetworkTimeoutErrorTest"
+              }
+            }
+          }
+        },
+        {
+          "name": "insertMany",
+          "object": "collection",
+          "arguments": {
+            "documents": [
+              {
+                "_id": 3
+              },
+              {
+                "_id": 4
+              }
+            ]
+          },
+          "expectError": {
+            "isError": true,
+            "errorLabelsContain": [
+              "SystemOverloadedError",
+              "RetryableError"
+            ]
+          }
+        }
+      ],
+      "expectEvents": [
+        {
+          "client": "client",
+          "eventType": "cmap",
+          "events": []
+        }
+      ]
+    }
+  ]
+}
diff --git a/test/discovery_and_monitoring/unified/backpressure-network-timeout-fail.json b/test/discovery_and_monitoring/unified/backpressure-network-timeout-fail-single.json
similarity index 93%
rename from test/discovery_and_monitoring/unified/backpressure-network-timeout-fail.json
rename to test/discovery_and_monitoring/unified/backpressure-network-timeout-fail-single.json
index a97c7a329f..54b11d4d5b 100644
--- a/test/discovery_and_monitoring/unified/backpressure-network-timeout-fail.json
+++ b/test/discovery_and_monitoring/unified/backpressure-network-timeout-fail-single.json
@@ -1,14 +1,12 @@
 {
-  "description": "backpressure-network-timeout-error",
+  "description": "backpressure-network-timeout-error-single",
   "schemaVersion": "1.17",
   "runOnRequirements": [
     {
       "minServerVersion": "4.4",
       "serverless": "forbid",
       "topologies": [
-        "single",
-        "replicaset",
-        "sharded"
+        "single"
       ]
     }
   ],
@@ -84,7 +82,11 @@
           "arguments": {
             "client": "client",
             "event": {
-              "serverDescriptionChangedEvent": {}
+              "serverDescriptionChangedEvent": {
+                "newDescription": {
+                  "type": "Standalone"
+                }
+              }
             },
             "count": 1
           }