diff --git a/backend/src/api/analysis_api.py b/backend/src/api/analysis_api.py
index a99aa49..6adecf9 100644
--- a/backend/src/api/analysis_api.py
+++ b/backend/src/api/analysis_api.py
@@ -28,6 +28,23 @@ class ProtocolEvidence(BaseModel):
     drop_count: int = Field(0, description="Packets with verdict=drop for this protocol.")
     reject_count: int = Field(0, description="Packets with verdict=reject for this protocol.")
     unknown_count: int = Field(0, description="Packets with verdict pending/unknown or without a verdict.")
+    ethernet_protocol: Optional[str] = Field(None, description="Dominant Ethernet protocol associated with this protocol evidence.")
+    ip_protocol: Optional[str] = Field(None, description="Dominant IP protocol associated with this protocol evidence.")
+    layer_paths: List["ProtocolLayerPathEvidence"] = Field(
+        default_factory=list,
+        description="Optional Ethernet/IP breakdown contributing to this protocol evidence.",
+    )
+
+
+class ProtocolLayerPathEvidence(BaseModel):
+    ethernet_protocol: Optional[str] = Field(None, description="Ethernet protocol label for this path, if known.")
+    ip_protocol: Optional[str] = Field(None, description="IP protocol label for this path, if known.")
+    packet_count: int = Field(..., description="Packet observations supporting this path.")
+    last_seen: datetime = Field(..., description="Most recent packet timestamp supporting this path.")
+    accept_count: int = Field(0, description="Packets with verdict=accept for this path.")
+    drop_count: int = Field(0, description="Packets with verdict=drop for this path.")
+    reject_count: int = Field(0, description="Packets with verdict=reject for this path.")
+    unknown_count: int = Field(0, description="Packets with verdict pending/unknown or without a verdict.")
 
 
 class InterfaceHostProtocolEvidence(InterfaceHostEvidence):