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

DeviceNet supports a maximum of 64 nodes (MAC IDs 0–63) on a single network segment.

Question 2

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

Accepted Answer

Network (Layer 3)

Answer

Routers operate at OSI Layer 3 (Network layer), using IP addresses to determine the best path for forwarding packets between networks.

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

Determinism in industrial networks means that message delivery times are bounded and predictable, which is critical for real-time control applications.

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

AS-Interface is a low-cost, simple two-wire fieldbus specifically designed to connect binary (on/off) sensors and actuators at the field level.

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

WirelessHART is built on the IEEE 802.15.4 physical and data link layer standard, which provides low-power, low-data-rate mesh networking in the 2.4 GHz band.

(CAS) Certified Automation Specialist Practice Test

(CAS) Certified Automation Specialist Practice Test

CAS CAS Automation Specialist Network Communications & Protocols 2