Ericsson Technical Certification Program (ETCP) — Questions and Answers

Question 1: What is the primary advantage of a hybrid microwave solution that combines fiber and wireless links?

Eliminates all fiber infrastructure costs
Simplifies frequency coordination requirements
Reduces end-to-end latency below that of pure fiber
Provides path diversity for increased resilience and aggregate capacity (Correct answer)

Correct answer: Provides path diversity for increased resilience and aggregate capacity

Hybrid microwave bonds a fiber path and a wireless path, so if one path degrades the other compensates, improving both availability and total capacity.

Question 2: What is Ericsson's AMOS (Advanced MOS) used for in network management?

Providing a command-line scripting interface to manage Ericsson nodes directly (Correct answer)
Generating capacity planning reports
Managing DNS zones for operator domains
Automating customer onboarding

Correct answer: Providing a command-line scripting interface to manage Ericsson nodes directly

AMOS is Ericsson's proprietary MML-based CLI used to perform operations, maintenance, and configuration tasks directly on Ericsson network nodes.

Question 3: What is the function of RSVP-TE in Ericsson MPLS networks?

Provides dynamic host configuration
Manages subscriber authentication
Signals and reserves resources for traffic-engineered LSPs (Correct answer)
Monitors link utilization

Correct answer: Signals and reserves resources for traffic-engineered LSPs

RSVP-TE (Resource Reservation Protocol - Traffic Engineering) signals LSP setup and reserves bandwidth resources along the path.

Question 4: In Ericsson's 5G, what is the LADN (Local Area Data Network) feature?

A link aggregation feature for the N3 interface
A PDU session type that gives UEs access to a local data network only when within a specific geographic area (Correct answer)
A private network slice for enterprise customers
A low-power access technology for IoT devices

Correct answer: A PDU session type that gives UEs access to a local data network only when within a specific geographic area

LADN allows UEs to connect to local data networks (e.g., factory systems) only when physically within the LADN service area, supporting MEC and Industry 4.0 use cases.

Question 5: What is the role of the CHF (Charging Function) in Ericsson's 5G core?

Providing secure boot for cloud-native NFs
Managing CPU resource allocation for NF containers
Collecting online/offline charging data from SMF/PCF and interfacing with the billing system (Correct answer)
Charging the hardware components with firmware updates

Correct answer: Collecting online/offline charging data from SMF/PCF and interfacing with the billing system

The CHF (Charging Function) is the 5GC network function that processes charging triggers from the SMF and PCF, converging online (real-time credit control) and offline (CDR-based) charging.

Question 6: On the mobile, this is easily confused with the power button, which is simply regular. __ button with a _on it.

Black and circle (Correct answer)
Black and box
Black and x

Correct answer: Black and circle

On the mobile radio, the emergency button can be easily confused with the power button, which is simply a regular black button with a circle on it. This distinct marking helps differentiate the power function from the critical emergency activation button, preventing accidental activation during routine operations.

Question 7: Which of the following does not constitute ‘sensitive data’? Data consisting of information about....

...an individual's political opinions
...an individual's criminal convictions
...an individual's religious beliefs
...an individual's home address (Correct answer)

Correct answer: ...an individual's home address

Under data protection laws like GDPR, 'sensitive data' refers to specific categories requiring extra protection, such as information about an individual's religious beliefs, political opinions, or criminal convictions. An individual's home address, while considered 'personal data' because it can identify a person, does not fall into these special categories of 'sensitive data'. Sensitive data typically carries a higher risk of discrimination or harm if misused.

Question 8: In ENM, what does the 'CM' (Configuration Management) function allow operators to do?

Manage firewall rule sets
Monitor real-time call quality
Read and modify network element configurations programmatically (Correct answer)
Generate subscriber billing records

Correct answer: Read and modify network element configurations programmatically

Configuration Management in ENM allows operators to read, modify, and audit the parameters of network elements (NEs) from a central interface.

Question 9: What is the primary role of Ericsson's Network Manager (ENM)?

To centralize FCAPS network management for Ericsson network elements (Correct answer)
To provide customer-facing billing portals
To manage IT server infrastructure
To generate marketing analytics from network data

Correct answer: To centralize FCAPS network management for Ericsson network elements

Ericsson Network Manager (ENM) provides Fault, Configuration, Accounting, Performance, and Security (FCAPS) management for Ericsson RAN, transport, and core nodes.

Question 10: Cloud Security refers to

A broad set of policies
Deployment Controls
All of the above (Correct answer)
Technologies

Correct answer: All of the above

Cloud security is a comprehensive discipline that encompasses various elements to protect cloud environments. It includes strategic frameworks like policies, the technical safeguards provided by technologies, and the operational procedures known as deployment controls. Therefore, a holistic approach to cloud security integrates all these aspects to ensure robust protection for data and applications.

Question 11: In Ericsson EPC, what does the HSS store?

Cell-level radio measurements
Network topology and routing tables
Real-time call detail records
Subscriber identity, authentication keys, and service profiles (Correct answer)

Correct answer: Subscriber identity, authentication keys, and service profiles

The HSS (Home Subscriber Server) is the master database storing subscriber identities (IMSI/MSISDN), authentication credentials, and service subscription data.

Question 12: Which Ericsson product family is the primary platform for microwave backhaul?

Ericsson SGSN-MME
MINI-LINK (Correct answer)
Ericsson MSC-S
Ericsson RBS 6000

Correct answer: MINI-LINK

Ericsson's MINI-LINK product family is specifically designed and marketed for microwave backhaul applications.

Question 13: What is the primary purpose of MPLS Traffic Engineering (TE) in Ericsson transport networks?

Optimizing bandwidth utilization across network paths (Correct answer)
Encrypting data in transit
Managing VLAN segmentation
Providing IP address assignment

Correct answer: Optimizing bandwidth utilization across network paths

MPLS-TE allows operators to optimize bandwidth by directing traffic along specific paths rather than relying solely on shortest-path routing.

Question 14: In Ericsson's IP/MPLS transport, what does LSP stand for?

Logical Service Plane
Label Switched Path (Correct answer)
Link State Protocol
Layer Switching Point

Correct answer: Label Switched Path

LSP stands for Label Switched Path, the end-to-end path established through an MPLS network for forwarding labeled packets.

Question 15: What is the primary advantage of using SR-MPLS over traditional LDP in Ericsson transport networks?

Native support for IPv6 only
Lower physical layer bandwidth consumption
Higher encryption strength
Simplified control plane with source-based routing and no per-path state in transit nodes (Correct answer)

Correct answer: Simplified control plane with source-based routing and no per-path state in transit nodes

SR-MPLS eliminates the need for LDP or RSVP-TE signaling state in transit nodes, reducing control plane complexity while enabling traffic engineering.

Question 16: What is the main difference between NSA (Non-Standalone) and SA (Standalone) 5G deployment modes?

SA does not support voice services
NSA uses only mmWave spectrum; SA uses sub-6 GHz only
NSA requires more base stations per km²
NSA relies on 4G LTE as the anchor for control plane; SA uses a native 5G core for all functions (Correct answer)

Correct answer: NSA relies on 4G LTE as the anchor for control plane; SA uses a native 5G core for all functions

In NSA mode, the 5G NR radio is added while the 4G EPC handles control signaling; in SA mode, the full 5G core (AMF, SMF, UPF, etc.) handles all functions independently.

Question 17: Cloud providers ensure that _________via the cloud are secure by implementing testing and acceptance procedures for outsourced or packaged application code.

None of these
Applications available as a service (Correct answer)
Infrastructure as a service
Platform as a service

Correct answer: Applications available as a service

Cloud providers offering 'Applications available as a service' (SaaS) are directly responsible for the security of those applications. This means they must implement rigorous testing and acceptance procedures for all application code, whether developed internally or outsourced, to identify and mitigate vulnerabilities. This ensures that the software provided to customers is secure and reliable.

Question 18: What is the function of the SMSF (Short Message Service Function) in Ericsson's 5G core?

Provides inter-frequency handover for NR
Handles SMS delivery for 5G subscribers via the SBI (Correct answer)
Manages NAS (Non-Access Stratum) mobility procedures
Stores multimedia message content

Correct answer: Handles SMS delivery for 5G subscribers via the SBI

The SMSF integrates SMS services into the 5GC by interfacing with the AMF and SMS-SC to deliver text messages to 5G NR subscribers.

Question 19: What does ATPC stand for in Ericsson microwave transmission systems?

Automatic Traffic Priority Control
Adaptive Transmission Protocol Configuration
Advanced Topology Path Control
Automatic Transmit Power Control (Correct answer)

Correct answer: Automatic Transmit Power Control

ATPC (Automatic Transmit Power Control) reduces transmit power during clear conditions to minimize interference and save energy, increasing power only when the link fades.

Question 20: What does QoS DSCP marking do in an Ericsson IP transport network?

Assigns VLANs to traffic flows
Compresses packet payloads
Marks packets to indicate their priority for handling (Correct answer)
Encrypts headers for security

Correct answer: Marks packets to indicate their priority for handling

DSCP (Differentiated Services Code Point) marks packets in the IP header so network nodes can apply appropriate priority treatment.

Question 21: What protocol does Ericsson ENM use to communicate with YANG-based network elements for configuration?

NETCONF (Correct answer)
SNMP v2c
HTTP/1.1
TFTP

Correct answer: NETCONF

NETCONF (Network Configuration Protocol) combined with YANG data models is the modern standard for programmatic NE configuration used in ENM.

Question 22: In Ericsson's 5G NR RAN, what does 'gNB' stand for?

Gateway Node Base
Grid Node Broadband
Generalized Node B
Next-Generation Node B (Correct answer)

Correct answer: Next-Generation Node B

gNB (Next-Generation Node B) is the 5G NR base station, equivalent to the eNB in 4G LTE, that provides the radio access function in a 5G network.

Question 23: What is Massive MIMO in the context of Ericsson's 5G radio deployments?

A frequency aggregation method for carrier aggregation
A system with a large number of antenna elements enabling multi-user spatial multiplexing and beamforming (Correct answer)
A technique using a single large antenna element for wide coverage
A modulation scheme for millimeter-wave frequencies

Correct answer: A system with a large number of antenna elements enabling multi-user spatial multiplexing and beamforming

Massive MIMO uses dozens to hundreds of antenna elements to form precise beams toward multiple users simultaneously, dramatically increasing spectral efficiency.

Question 24: In Ericsson's 5G core (5GC), what function handles session management for user data bearers?

UPF
SMF (Correct answer)
NRF
AMF

Correct answer: SMF

The SMF (Session Management Function) establishes, modifies, and releases PDU sessions and assigns IP addresses to UEs in the 5G core.

Question 25: Which routing protocol is most commonly used for inter-domain routing in Ericsson transport network deployments?

OSPF
RIP
BGP (Correct answer)
IS-IS

Correct answer: BGP

BGP (Border Gateway Protocol) is the standard inter-domain routing protocol used between autonomous systems in transport networks.

Question 26: What frequency range defines the E-band used in high-capacity Ericsson MINI-LINK deployments?

38–42 GHz
6–11 GHz
18–23 GHz
71–86 GHz (Correct answer)

Correct answer: 71–86 GHz

E-band occupies 71–86 GHz, offering large channel bandwidths (up to 2 GHz) that enable multi-gigabit backhaul over short distances.

Question 27: Which Ericsson OSS component is responsible for collecting and presenting network performance KPIs?

Site Installation Manager
PM (Performance Management) service in ENM (Correct answer)
Radio Dot System manager
Ericsson Charging System

Correct answer: PM (Performance Management) service in ENM

The Performance Management service in ENM collects performance counters and KPIs from network elements and presents them in reports and dashboards.

Question 28: Problems with Charger radios. The whips are 48 inches. According to the cutting chart, they should be what length for proper range?

46.75 (Correct answer)
48.5
47
44.5

Correct answer: 46.75

According to the cutting chart for Charger radios, the whips, which are initially 48 inches, should be cut to a length of 46.75 inches for proper range. This precise length adjustment is crucial for optimizing the radio's antenna performance, ensuring maximum signal transmission and reception efficiency.

Question 29: In Ericsson's 5G NR, what is the 'UE Inactive state' introduced to improve network efficiency?

A state used only during emergency calls
An intermediate state between Connected and Idle that preserves UE context in the RAN to enable fast re-activation without a full RRC connection setup (Correct answer)
A low-power state used only for IoT devices in mMTC deployments
A state where the UE is powered off but retains its IP address

Correct answer: An intermediate state between Connected and Idle that preserves UE context in the RAN to enable fast re-activation without a full RRC connection setup

The RRC Inactive state (introduced in 5G NR) stores UE context in the last-serving gNB, enabling the UE to resume data activity with minimal signaling overhead compared to a full re-establishment.

Question 30: Narrow banding & Charger / Taurus radio range problems If an officer turns on the radio and Ch 2 says it needs to be programmed before_?

Point to point, January 1
Mutual aid, December 31
Mutual aid, January 1 (Correct answer)

Correct answer: Mutual aid, January 1

For Charger/Taurus radios experiencing narrow banding and range problems, if an officer turns on the radio and Channel 2 displays "Mutual aid," it indicates that the radio needs to be reprogrammed before January 1. This specific message and deadline are critical for ensuring the radio's compliance with narrow banding regulations and maintaining proper functionality.

Question 31: What is Ericsson's 'Spectrum Sharing' capability between 4G and 5G called when used on the same physical antenna?

Antenna-Integrated Radio (AIR) with DSS software (Correct answer)
Licensed Assisted Access (LAA)
Multi-band MIMO
Carrier Aggregation (CA)

Correct answer: Antenna-Integrated Radio (AIR) with DSS software

Ericsson's AIR radios with DSS software support running LTE and 5G NR simultaneously on the same antenna and spectrum, maximizing hardware reuse during 5G rollout.

Question 32: In Ericsson's Segment Routing (SR) deployment, what replaces traditional RSVP-TE signaling?

Static MPLS labels
OSPF extensions only
Source-based path encoding using segments (Correct answer)
LDP

Correct answer: Source-based path encoding using segments

Segment Routing encodes the forwarding path directly in the packet header using ordered segments, eliminating the need for per-flow RSVP-TE state in the network.

Question 33: In Ericsson's 5G standalone (SA) architecture, how does the gNB connect to the 5GC?

Via the Iub interface to the RNC
Via the S1-U interface to the SGW
Via the X2 interface to the MME
Via the N2 (control) and N3 (user plane) interfaces to AMF and UPF respectively (Correct answer)

Correct answer: Via the N2 (control) and N3 (user plane) interfaces to AMF and UPF respectively

In 5G SA, the gNB uses N2 for control plane signaling to the AMF and N3 for user plane data to the UPF, replacing the 4G S1-MME/S1-U interfaces.

Question 34: What is Ericsson's 'Integrated Access and Backhaul (IAB)' technology?

An indoor antenna system for enterprise deployments
A fiber backhaul product for dense urban areas
A solution that allows a gNB node to simultaneously serve UEs and wirelessly relay backhaul traffic for other nodes (Correct answer)
A joint product with a third-party ISP for backhaul provisioning

Correct answer: A solution that allows a gNB node to simultaneously serve UEs and wirelessly relay backhaul traffic for other nodes

IAB nodes use 5G NR air interface for both access (serving UEs) and backhaul (relaying traffic to the network), enabling rapid dense deployment without fiber to every site.

Question 35: Which protocol provides link-level failure detection in milliseconds in Ericsson IP transport, often used alongside OSPF or BGP?

LLDP
STP
LACP
BFD (Bidirectional Forwarding Detection) (Correct answer)

Correct answer: BFD (Bidirectional Forwarding Detection)

BFD provides rapid sub-second failure detection between directly connected or remote routing peers, enabling faster protocol convergence.

Question 36: In Ericsson's 5G RAN, what is the purpose of the F1 interface?

Provides timing reference to the RU
Connects the CU to the DU within a disaggregated gNB (Correct answer)
Links two gNBs for X2-equivalent communication
Connects the gNB to the 5GC AMF

Correct answer: Connects the CU to the DU within a disaggregated gNB

The F1 interface (F1-C for control, F1-U for user plane) is the 3GPP-defined interface between the gNB-CU and gNB-DU in a split RAN architecture.

Question 37: In Ericsson transport, what is the role of a Route Reflector in BGP?

To balance load between WAN links
To reduce the number of BGP sessions required in an AS (Correct answer)
To translate between IPv4 and IPv6
To assign MPLS labels to packets

Correct answer: To reduce the number of BGP sessions required in an AS

A Route Reflector allows BGP route propagation within an AS without requiring a full mesh of iBGP sessions between all routers.

Question 38: What is Ericsson's 'Subscriber Data Management (SDM)' solution used for?

Generating subscriber usage analytics for marketing
Centralizing subscriber profile storage and providing unified access for HSS, HLR, and AAA functions across network generations (Correct answer)
Managing network topology data for OSS
Managing physical SIM card inventory

Correct answer: Centralizing subscriber profile storage and providing unified access for HSS, HLR, and AAA functions across network generations

Ericsson's SDM consolidates subscriber identity and profile data across 2G/3G/4G/5G, acting as a unified backend for HLR, HSS, UDM, and AAA nodes.

Question 39: In Ericsson IP transport, what is a VRF used for?

Creating separate virtual routing tables for different customers or services (Correct answer)
Encrypting inter-node traffic
Managing physical port configurations
Measuring packet loss on a link

Correct answer: Creating separate virtual routing tables for different customers or services

A VRF (Virtual Routing and Forwarding) instance creates an isolated routing table, allowing multiple customers or services to share the same physical infrastructure.

Question 40: Which encapsulation is used in Ericsson's Carrier Ethernet services to transport Layer 2 frames over an MPLS core?

Pseudowire (PWE3) (Correct answer)
GRE
IPsec tunnel
VXLAN

Correct answer: Pseudowire (PWE3)

Pseudowire (PWE3) encapsulates Layer 2 frames inside MPLS labels to transport Ethernet, ATM, or TDM services over an IP/MPLS backbone.

Question 41: Which Ericsson feature allows a single physical interface to carry multiple logical connections with separate SLAs in transport networks?

Link Aggregation (LAG)
Jumbo Frames
Hierarchical QoS (H-QoS) (Correct answer)
Port Mirroring

Correct answer: Hierarchical QoS (H-QoS)

Hierarchical QoS (H-QoS) applies multi-level scheduling policies so different services on the same interface receive their guaranteed bandwidth and latency treatment.

Question 42: In 5G NR, what does 'SSB (Synchronization Signal Block)' enable a UE to do?

Establish a data bearer with the UPF
Perform RF power calibration
Perform call setup signaling with the AMF
Detect the cell, acquire time/frequency synchronization, and decode the master information block (MIB) (Correct answer)

Correct answer: Detect the cell, acquire time/frequency synchronization, and decode the master information block (MIB)

The SSB contains the PSS, SSS, and PBCH, allowing a UE to detect a 5G cell, synchronize its timing and frequency, and read basic system information.

Question 43: In Ericsson's OSS, what is the purpose of 'Bulk CM' functionality?

Backing up packet core subscriber sessions
Streaming live call statistics to dashboards
Managing mass subscriber activations in BSS
Exporting and importing bulk configuration changes to/from multiple NEs simultaneously (Correct answer)

Correct answer: Exporting and importing bulk configuration changes to/from multiple NEs simultaneously

Bulk CM allows operators to export NE configurations to files, edit them offline, and re-import changes to hundreds of NEs in a single operation.

Question 44: What is the primary purpose of Adaptive Coding and Modulation (ACM) in a microwave link?

To replace frequency planning entirely
To adjust modulation order and coding rate based on current link conditions (Correct answer)
To manage IP routing table updates
To increase physical antenna aperture

Correct answer: To adjust modulation order and coding rate based on current link conditions

ACM dynamically lowers the modulation order during signal degradation (e.g., rain fade) to maintain link availability at the cost of reduced throughput.

Question 45: What is the difference between TDD and FDD in Ericsson 5G NR spectrum usage?

FDD requires Massive MIMO; TDD does not
FDD uses separate paired spectrum for UL/DL simultaneously; TDD uses the same frequency alternating UL/DL over time (Correct answer)
TDD uses separate frequencies for uplink and downlink; FDD uses the same frequency with time slots
TDD supports only voice; FDD supports only data

Correct answer: FDD uses separate paired spectrum for UL/DL simultaneously; TDD uses the same frequency alternating UL/DL over time

FDD uses paired spectrum bands (separate UL and DL frequencies) operating simultaneously, while TDD uses a single band and switches between UL and DL in time.

Question 46: What does XPIC stand for in Ericsson MINI-LINK microwave systems?

Cross-Polarization Interference Cancellation (Correct answer)
Cross-Path Isolation Circuit
Cross-Path Interference Control
Cross-Polarization Interference Correction

Correct answer: Cross-Polarization Interference Cancellation

XPIC stands for Cross-Polarization Interference Cancellation, enabling both polarizations on the same frequency to double spectral efficiency.

Question 47: Which Ericsson router platform is designed for high-capacity IP/MPLS core network deployments?

Ericsson Router 6000 (Correct answer)
SEIL X4
Smart Edge 6000
SSR 8000

Correct answer: Ericsson Router 6000

The Ericsson Router 6000 series is purpose-built for high-capacity core and edge IP/MPLS deployments.

Question 48: Which technology does Ericsson use for network synchronization in transport networks to support LTE/5G timing requirements?

SNTP
PTP (IEEE 1588) (Correct answer)
NTP
TRILL

Correct answer: PTP (IEEE 1588)

PTP (Precision Time Protocol, IEEE 1588) provides the sub-microsecond synchronization accuracy required by LTE and 5G base stations.

Question 49: What do we charge a customer that wants us to send them any data that we hold about them?

£10 (Correct answer)
£20
£5
£5 per item of data

Correct answer: £10

This question refers to the fee charged for a Subject Access Request (SAR) under specific data protection legislation, likely the Data Protection Act 1998 (DPA 1998) in the UK before GDPR. Under the DPA 1998, organizations were permitted to charge a statutory fee, typically £10, for processing a SAR. While GDPR generally removed this fee, the context suggests this specific fee was applicable.

Question 50: In ENM, what is the 'FMX' (Fault Management eXtension) framework used for?

Managing FTP media exchanges between network nodes
Providing field measurement tools for RF engineers
Extending ENM's alarm handling with custom correlation rules and automated remediation scripts (Correct answer)
Configuring firewall extensions on core nodes

Correct answer: Extending ENM's alarm handling with custom correlation rules and automated remediation scripts

FMX allows operators to create custom alarm correlation rules and automate responses to specific fault patterns within ENM's Fault Management service.

Question 51: Cloud providers have _ and __plans in place to ensure that service can be maintained in case of a disaster or an emergency and that any data lost will be recovered.

Business continuity and project management
None of these
Business continuity and data recovery (Correct answer)
Business continuity and risk management

Correct answer: Business continuity and data recovery

Cloud providers must have robust strategies in place to ensure continuous service availability and data integrity. Business continuity plans outline procedures to maintain essential functions during disruptions, while data recovery plans detail how lost data can be restored after an incident. These two plans are crucial for minimizing downtime and preventing permanent data loss, assuring customers of service resilience and data safety.

Question 52: In Ericsson's EPC, what does the SGW (Serving Gateway) do?

Authenticates subscribers using AKA procedures
Provides IP address allocation to UEs
Manages inter-PLMN roaming policy
Acts as the mobility anchor for user plane data during intra-LTE handovers and idle-mode paging (Correct answer)

Correct answer: Acts as the mobility anchor for user plane data during intra-LTE handovers and idle-mode paging

The SGW anchors the user plane bearers during handovers between eNBs, buffers downlink data during UE paging, and routes packets between the eNB and PGW.

Question 53: Which synchronization standard provides phase and time synchronization required by LTE and 5G in Ericsson microwave backhaul?

SONET OC-3
NTP v4
SDH STM-1
IEEE 1588v2 (PTP) (Correct answer)

Correct answer: IEEE 1588v2 (PTP)

IEEE 1588v2 (Precision Time Protocol) delivers sub-microsecond phase/time accuracy needed for LTE TDD and 5G NR synchronization.

Question 54: What is the purpose of Ethernet OAM (802.3ah/802.1ag) in Ericsson Carrier Ethernet deployments?

To increase Ethernet frame throughput
To detect and locate faults in Ethernet links and services (Correct answer)
To assign IP addresses to Ethernet devices
To encrypt Ethernet frames end-to-end

Correct answer: To detect and locate faults in Ethernet links and services

Ethernet OAM protocols (802.3ah for link-level and 802.1ag for end-to-end service) enable fault detection, path discovery, and performance monitoring.

Question 55: Which Ericsson product line is used to provide microwave backhaul connectivity for mobile sites?

Ericsson RBS 6000
Ericsson MSC-S
Ericsson Smart Services Router
Ericsson MINI-LINK (Correct answer)

Correct answer: Ericsson MINI-LINK

Ericsson MINI-LINK is the portfolio of microwave backhaul solutions used to connect base stations to the core transport network.

Question 56: In Ericsson transport networks, what does OAM stand for?

Outbound Aggregation Mechanism
Operations, Administration, and Maintenance (Correct answer)
Open Access Management
Optical Amplifier Module

Correct answer: Operations, Administration, and Maintenance

OAM (Operations, Administration, and Maintenance) encompasses tools and protocols for monitoring, fault detection, and management of network services.

Question 57: What does the term 'Fast Reroute (FRR)' mean in Ericsson MPLS transport?

A technique for accelerating packet queuing
A protocol for rapid BGP convergence
A hardware mechanism for forwarding at line rate
A method to quickly switch to a pre-computed backup path when a failure is detected (Correct answer)

Correct answer: A method to quickly switch to a pre-computed backup path when a failure is detected

MPLS Fast Reroute provides sub-50ms failure recovery by switching to a pre-established backup LSP upon detecting a link or node failure.

Question 58: What does 'UE IP Address Preservation' during handover mean in Ericsson's packet core design?

The MME backs up UE IP addresses in the HSS
The UE stores its IP address in a local SIM file for recovery after power loss
The PGW reserves IP addresses for 24 hours after session teardown
The UE retains its IP address throughout mobility events so active sessions are not disrupted (Correct answer)

Correct answer: The UE retains its IP address throughout mobility events so active sessions are not disrupted

Because the PGW/UPF acts as the IP anchor, the UE keeps the same IP address as it moves between eNBs or gNBs, preserving TCP/UDP sessions during handover.

Question 59: What does 'CUPS' (Control and User Plane Separation) enable in Ericsson's evolved packet core?

Physically separating the MME from the HSS for redundancy
Isolating billing data from subscriber management data
Separating the RAN control plane from the transport layer
Separating SGW and PGW control plane functions from their user plane functions, allowing them to scale independently (Correct answer)

Correct answer: Separating SGW and PGW control plane functions from their user plane functions, allowing them to scale independently

CUPS decouples the control plane (SGW-C, PGW-C) from the user plane (SGW-U, PGW-U), enabling the user plane to be distributed closer to the network edge while control remains centralized.

Question 60: If, however, the emergency alarm is on a MO IO channel, or another statewide talk group, what must be done?

Every dispatch console in the state has to acknowledge the alarm. (Correct answer)
Every dispatch console in Troop A along with all MCD officers must acknowledge the alarm
Every dispatch console in Troop A must acknowledge the alarm

Correct answer: Every dispatch console in the state has to acknowledge the alarm.

If an emergency alarm is activated on a MO IO channel or another statewide talk group, it necessitates acknowledgment from every dispatch console across the entire state. This comprehensive acknowledgment ensures that all relevant personnel are aware of the critical situation, reflecting the widespread nature and importance of a statewide emergency.

Ericsson Technical Certification Program (ETCP)

The ETCP validates technical competence in Ericsson telecommunications technologies, covering microwave and transmission solutions, IP and transport networks, and packet core and service continuity for ICT engineers and solution architects.

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