CAS CAS Automation Specialist Network Communications & Protocols 2

Question 1

In a DeviceNet network, what is the maximum number of nodes allowed on a single network segment?

Accepted Answer

64

Answer

32

Answer

128

Answer

256

Question 2

Which layer of the OSI model does an IP router primarily operate at?

Accepted Answer

Network (Layer 3)

Answer

Data Link (Layer 2)

Answer

Transport (Layer 4)

Answer

Physical (Layer 1)

Question 3

What does the term 'determinism' mean in the context of industrial communication protocols?

Accepted Answer

Data delivery occurs within a guaranteed, predictable time frame

Answer

Data is encrypted using a fixed algorithm

Answer

All nodes on the network have equal access priority

Answer

The network automatically reconfigures after a fault

Question 4

AS-Interface (AS-i) is primarily designed for connecting which type of devices at the lowest level of the automation hierarchy?

Accepted Answer

Binary sensors and actuators

Answer

High-speed servo drives

Answer

SCADA servers

Answer

Engineering workstations

Question 5

Which wireless protocol standard, operating in the 2.4 GHz ISM band, is most commonly used for industrial wireless sensor networks (WirelessHART)?

Accepted Answer

IEEE 802.15.4

Answer

IEEE 802.11n

Answer

IEEE 802.3

Answer

Bluetooth 5.0

Question 6

In Modbus TCP/IP, what is the default port number used for communication?

Accepted Answer

502

Answer

102

Answer

44818

Answer

2222

Question 7

What is the purpose of a 'terminating resistor' at each end of a PROFIBUS or RS-485 network?

Accepted Answer

To absorb signal reflections and prevent data corruption

Answer

To limit current and protect devices from overvoltage

Answer

To provide power to the bus devices

Answer

To convert RS-485 signals to RS-232