IBM Interview Questions and Answers

Transport protocol in CAN J1939 is used for transmitting large data packets over the network.

• Transport protocol breaks down large data packets into smaller segments for transmission.

• It uses a flow control mechanism to ensure all segments are received and reassembled in the correct order.

• Examples of transport protocols in J1939 include BAM (Broadcast Announce Message) and RTS/CTS (Request To Send/Clear To Send).

Read DTCs service in UDS is used to retrieve diagnostic trouble codes from a vehicle's electronic control unit.

• DTCs are codes that indicate a problem with a vehicle's systems or components

• The read DTCs service allows technicians to identify and diagnose issues with a vehicle

• The service is part of the Unified Diagnostic Services (UDS) protocol used in automotive diagnostics

• Examples of DTCs include P0300 (random/multiple cylinder misfire detected) and U0100 (lost communication ...read more

CAN bus off is a state where communication between nodes on a CAN bus is lost. It can be recovered by resetting the bus or fixing the underlying issue.

• CAN bus off occurs when a node on the bus detects an error and goes into a fault state.

• This can happen due to issues like a short circuit, open circuit, or excessive noise on the bus.

• To recover from CAN bus off, the bus needs to be reset or the underlying issue needs to be fixed.

• Resetting the bus involves sending a sequence of ...read more

Security Access Service in UDS is responsible for managing access control and authentication for various UDS services.

• Security Access Service provides secure authentication and authorization for UDS services.

• It manages access control policies and enforces them across UDS services.

• It supports various authentication mechanisms such as username/password, certificates, and tokens.

• Examples of UDS services that use Security Access Service include User Management Service and Device ...read more

Successfully completing a project involves thorough planning, effective communication, strong leadership, and attention to detail.

• Thoroughly plan the project scope, timeline, and resources needed

• Communicate effectively with team members, stakeholders, and clients

• Demonstrate strong leadership skills to motivate and guide the team

• Pay attention to detail to ensure quality and accuracy in project execution