H31-311 Online Practice Questions and Answers

Which of the following effects is used by the Raman amplifier?

A. Self-phase modulation (SPM)

B. Dispersion

C. Raman scattering

D. Four-wave mixing (FWM)

The pointer is used for alignment and indicates the start position of VC-n in the corresponding AU or TU frame. In this way, the receive end can correctly remove the corresponding VC from the STM-N, and then split the VC and C encapsulation to separate low-rate signals, such as PDH. That is, low-rate tributary signals can be directly dropped from the STM-N signal.

A. TRUE

B. FALSE

The Kl and K2 bytes can transmit APS switching signaling, and can also indicate that the multiplex section signal fails.

A. TRUE

B. FALSE

In the frame structure of SDH signals, there are abundant overhead bytes used for operation, administration, and maintenance (OAM). The overhead bytes account for ( ) of all bits in the entire frame and greatly enhance the monitoring functions of the network.

A. 1/10

B. 1/20

C. 1/30

D. 1/40

On a Layer 2 switching device, if the Ethernet port is an Access port, the port can receive only the Ethernet frames without VLAN tags or Ethernet frames with the same VLAN ID as the default VLAN ID of the port.

A. TRUE

B. FALSE

Which of the following working windows is indicated by "2" in the optical module parameter L-64.2"?

A. 880 nm

B. 1310 nm

C. 1550 nm

D. 1510 nm

The difference between a dispersion compensation fiber and a common fiber is that the dispersion compensation fiber has a negative dispersion coefficient at ( ).

A. 1310 nm

B. 1550 nm

C. 800 nm

D. 1650 nm

Which of the following layers defines the protocols that control the network layer? The protocols of the layer work on logical links, that is end-to-end connections between two devices.

A. Network layer

B. Data link layer

C. Transport layer

D. Application layer

When multiple users need to share the same VCTRUNK and use the same VLAN ID, the QinQ technology can be used.

A. TRUE

B. FALSE

A 1510 nm optical supervisory channel can be effectively amplified after it passes an EDFA.

A. TRUE

B. FALSE