Which of the following layers define the protocols that control the network layer? The protocol for this layer applies to logical links, i.e. end-to-end connectivity between two devices.

When the ACT indicator of the SDH board is off, it means that the board has a hardware failure and cannot be used.

Automatic Laser Shutdown (ALS): When no optical signal is received, the ALS function automatically turns off the corresponding optical module. This feature protects field maintenance personnel.

In a WDM system, when the number of wavelengths is greater than ( ), the arrayed waveguide grating (AWG) is recommended.

When you configure services on a per-NE basis, which of the following protection scenarios does not require subnet configuration before subsequent protection operations?

According to the formula " ODUk rate = 239/(239k) x STM-N frame rate " , ODU4 The rate is equal to the 239/235xSTM-N Pa rate.

Establish Ethernet leased line service between HI (HQ) and H2 (branch) of enterprise H, and bind 5 in the corresponding VCTRUNK VC-12. When a VC-12 fails, the Ethernet dedicated line between H1 and H2 is interrupted. So, which of the following statements is true?

Which of the following are the service board types for MSTP devices? (Multiple choice).

By default, B2-EXC alerts are reported when the number of B2 bit Falses exceeds the () threshold.

RSOH, MSOH, HPOH and LPOH implement the monitoring function in descending order of the monitoring fan country.