Missing Support for Integrity Check

When a protocol doesn't include integrity checks like checksums, there's no reliable way for the receiving end to know if the data arrived exactly as it was sent. Corruption from network errors, hardware faults, or even malicious tampering can go undetected. This missing layer of validation means corrupted data is passed directly to the application, which must then bear the full responsibility for detecting these errors—if it can at all. The principle of end-to-end integrity argues that verification should happen at the lowest protocol layer where it can be fully implemented. A protocol-level checksum is the most effective guard because it validates an entire message or session, not just individual network packets. While applications should still perform their own input validation, relying solely on that is riskier and less efficient than having the underlying communication channel guarantee data integrity from the start.