4G/5G Test

Focuses on LTE system design, spanning E-UTRAN and EPC architecture, role of core entities (MME, SGW, PGW, HSS, PCRF), and the layered LTE protocol stack (PHY, MAC, RLC, PDCP, RRC, NAS). Includes attach, bearer setup, handover signaling, and evolution to LTE-Advanced features such as Carrier Aggregation, CoMP, and advanced MIMO. This area validates solid understanding of 4G baseline networks and their enhancement path.

Tests knowledge of 5G NR radio interface innovations, including scalable numerologies, slot/frame structure, massive MIMO, beamforming, and spectrum operation across sub-6 GHz and mmWave. Covers Dynamic Spectrum Sharing (DSS), spectrum efficiency, and the performance trade-offs in 5G air interface design. Ensures candidates can apply NR concepts to practical deployment and coverage scenarios.

Assesses comprehension of both legacy EPC and cloud-native 5GC. Includes entity functions (MME/SGW/PGW vs AMF/SMF/UPF/PCF/NRF), control vs. user plane separation, session management, and signaling flows. Emphasis on Service-Based Architecture (SBA), microservice principles, and network exposure functions. Tests the ability to design and troubleshoot core-level connectivity in both NSA and SA deployments.

Evaluates multimedia service delivery: IMS integration, VoLTE call setup, VoNR/Vo5G flows, SRVCC handovers, and QoS Class Identifiers (QCI/5QI). Also covers bearer management, packet prioritization, and support for critical services such as mission-critical voice. Demonstrates mastery in ensuring high-quality, reliable voice and data experiences across evolving networks.

Tests the candidate’s ability to design and manage virtualized logical networks (slices) for different use cases (eMBB, URLLC, mMTC). Includes MEC for ultra-low latency service delivery and IoT integration via LTE-M, NB-IoT, and RedCap. Validates understanding of how 5G supports diverse verticals like autonomous vehicles, healthcare, and industrial IoT by combining slicing, edge compute, and device ecosystem knowledge.

Assesses telecom-specific security frameworks: LTE authentication (EPS-AKA), 5G authentication (5G-AKA/EAP-AKA’), key derivation, and subscriber privacy (SUPI/SUCI). Covers threats such as signaling storms, rogue base stations, DDoS, and jamming, alongside mitigation strategies. Ensures candidates can design and enforce robust, standards-compliant security for both RAN and core networks.

Focuses on practical deployment choices and optimization techniques. Includes NSA vs SA rollout strategies, spectrum refarming, coverage/capacity balancing, mobility management, interference mitigation, SON (Self-Organizing Networks), and AI/ML-based assurance. Demonstrates readiness to implement, tune, and optimize networks for real-world traffic patterns and enterprise demands.

Evaluates knowledge of vertical and enterprise deployments such as private 5G networks, Industry 4.0 automation, smart cities, AR/VR, remote healthcare, and automotive V2X. Covers monetization strategies (slice-as-a-service, enterprise SLAs, B2B2X models). Ensures candidates understand how to translate 4G/5G technologies into revenue streams and business value.

Tests awareness of 3GPP release roadmap (R15–R18), O-RAN Alliance initiatives, ETSI MANO orchestration, ONAP frameworks, and multi-vendor interoperability challenges. Includes forward-looking aspects of 5G Advanced and early 6G research directions. Validates strategic understanding of ecosystem evolution and the ability to align deployments with global standards and vendor ecosystems.