Quantum networking functions through quantum mechanical principles of superposition and entanglement to establish ultra-secure communications by means of secure data transmission. Secure transmission between devices takes place on quantum network infrastructure through QKD protocols including BB84 and E91 to stop encryption keys from being intercepted. This paper examines quantum network architectural elements while studying its security protocols for communication and explains quantum advantages over standard encryption systems. Analysis of vital performance data provides evaluation on the implementation potential of long-term quantum-secured communication using measurements of key generation frequencies and quantum bit error rates (QBER) and entanglement fidelity metrics and network transmission times. The increased security from QKD faces scalability challenges because decoherence and noise influence longer distances. The deployment of quantum repeaters extends transmission effectiveness so entanglement distribution improves and system errors decrease. Research indicates that quantum communication delivers better security than conventional methods which makes it suitable for protecting financial operations and defense as well as healthcare sector protection tasks. Engineering teams face various technical barriers in developing quantum networking because they need to improve quantum hardware simultaneously with robust error correction systems that interact with classical network systems. Modern cryptography utilizes quantum and classical models combined with post-quantum security methods to repair present risks in information security systems. The development of quantum systems results in quantum Internet development that creates absolute cybersecurity via attack protection.