Which of the following statements about switches and how they work is correct?

The network managed by the switch belongs to a broadcast domain

Learning based on the source MAC address and forwarding based on the destination MAC address

Use the address aging mechanism to maintain the MAC address table

The network managed by the switch belongs to a broadcast domain

Learning based on the source MAC address and forwarding based on the destination MAC address

Use the address aging mechanism to maintain the MAC address table

When the destination MAC in the received Ethernet frame is not in its own address table, broadcast the frame to all ports

Which of the following statements about the internal port attributes of an Ethernet board is incorrect?

For the ingress port of the Access attribute: if the input data does not have a VLAN ID, it will be transparently transmitted directly

For the ingress port of the Tag Aware attribute: if the input data has a VLAN ID, the received data will be transparently transmitted

For the ingress port of the Tag Aware attribute: if the input data does not have a VLAN ID, discard it

For the ingress port of the Access attribute: if the input data does not have a VLAN ID, it will be transparently transmitted directly

Ingress to the Access attribute: if the input data has a VLAN ID, discard the

Which of the following options is not the reason for the R-LOS alarm?

The laser at the transceiver end is damaged

Which of the following reasons may cause bit errors in the business?

The dispersion compensation is unreasonable, such as under-compensation or over-compensation

The optical power of the incoming fiber is too high or too low

The performance of the transmitting laser of the OTU board at the originating end deteriorates

The pigtail connector is seriously polluted

The dispersion compensation is unreasonable, such as under-compensation or over-compensation

The optical power of the incoming fiber is too high or too low

The performance of the transmitting laser of the OTU board at the originating end deteriorates

The pigtail connector is seriously polluted

Which of the following are the possible causes of PW failures in the network?

When using LDP to create a PW, if the LDP session fails, the PW creation fails

The Tunnel that hosts the PW itself has a communication problem

When using LDP to create a PW, if the LDP session fails, the PW creation fails

The Tunnel that hosts the PW itself has a communication problem

When a PW is created in static mode, the IS-IS exchange route fails, resulting in unsuccessful PW creation

Which of the following options is not the cause of the R-LOF alarm?

The received signal is attenuated too much

The signal sent by the peer station has no frame structure

The receiving direction of the board is faulty

Which of the following parameter settings will cause PW creation to fail?

In the Ethernet private line, the VLANs of the two PWs are inconsistent

The control words at both ends of the PW are inconsistent

In the CES leased line configuration, the number of time slots at both ends is inconsistent

Automatic assignment of PW ID values

Which of the following descriptions of the electrical layer multiplexing and mapping steps of ODU0 is wrong?

After mapping and multiplexing, 34 channels of ODU0 signals can be finally multiplexed into 1 channel of OTU3V signals

After mapping and multiplexing, the 2 ODU0 signals can be finally multiplexed into 1 OTU1IV signal

After mapping and multiplexing of 8 ODU0 signals, it can be finally used as 1 OTU2V signal

After mapping and multiplexing, 34 channels of ODU0 signals can be finally multiplexed into 1 channel of OTU3V signals

After mapping and multiplexing, 80 channels of ODU0 signals are finally multiplexed into 1 channel of OTU4V signals

Which of the following statements about EDFA is false?

1510nm optical monitoring channel can be effectively amplified by EDFA

The amplification of optical signal by EDFA is pure optical amplification, no need for photoelectric conversion

Noise figure, saturated output power, gain flatness, gain, etc. are all important parameters to characterize EDFA

1510nm optical monitoring channel can be effectively amplified by EDFA

When the output power of the EDFA reaches saturation, increase the input optical power, and the gain of the EDFA will decrease.

Which of the following statements about ESD protection measures is false?

Controlling humidity has little effect on reducing static electricity

All personnel entering the computer room should wear anti-static shoes, anti-static clothing, etc.

Use anti-static tools, such as: anti-static wrists, anti-static tweezers, pullers, etc.

Controlling humidity has little effect on reducing static electricity

All conductors in the computer room must be grounded reliably, including computer terminals and other equipment, and an anti-static workbench must be set up

Static sources such as non-anti-static plastic bags, non-anti-static bubble films, and rubber should be kept away from ESD sensitive devices and sensitive boards, at least 30cm away.

Which of the following statements about the FEU board is false?

Using ESC, OTM station needs a FIU

The FIU board does not process monitoring information

The FIU can complete the access and release of the OSC channel

Using ESC, OTM station needs a FIU

Using OSC, both OLA station and OADM station need two FIUs

Which of the following statements about the MPLS-TPOAM level is correct?

Section is the service layer of Tunnel, Tunnel is the service layer of PW, PW is the service layer of Service

Service is the service layer of PW, PW is the service layer of Tunnel, and Tunnel is the service layer of Section

Section is the service layer of PW, PW is the service layer of Tunnel, and Tunnel is the service layer of Service

Section is the service layer of Tunnel, Tunnel is the service layer of PW, PW is the service layer of Service

Tunnel is the service layer of PW, PW is the service layer of Service, Service is the service layer of Section

Which of the following statements about Uexpert is correct?

Uexpert can automate U2000 upgrades

Support U2000 remote graphical upgrade

Basic Ueasy inspection tool to reduce the risk of upgrade failure

Uexpert can automate U2000 upgrades

Support U2000 remote graphical upgrade

Currently does not support dual system upgrade

Basic Ueasy inspection tool to reduce the risk of upgrade failure

Which of the following descriptions about network protection switching test is wrong?

Before testing, you need to set the 1:1 linear multiplex section protection mode to single-ended switching.

During the protection switching of the linear multiplex section, the NE reports the APS_INDI and MS_APS_INDI_EX alarms

SNCP protection is configured. When the laser of the interface connected to the opposite end is turned off, observe the SDH analyzer of the local end.

There are two methods for testing the protection switching of the multiplex section: the singleended loopback test method and the double-ended hanging meter test method