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Which of the following signals is sent back to the sender by the receiver?

A.

AIS

B.

LCK

C.

IAE

D.

BDI

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

A.

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

B.

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

C.

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

D.

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

STM-N signal transmission on the line needs to be scrambled, mainly to facilitate collection and extraction of line timing signals. Will all bytes in the SDH frame structure be

scrambled?

A.

True

B.

False

L--16.1 indicates the type of optical interface. Which of the following descriptions is correct?

A.

Short distance communication, the signal level is STM-1 and the working window is 1310nm

B.

Long distance communication, the signal level is STM-1 and the working window is 1310nm

C.

Short distance communication, the signal level is STM-16 and the working window is 1550nm

D.

Short-distance week-to-week communication, the signal level is STM-16 and the working window is 1310nm

Of the following protections, which items are protected by the double transmission and reception of the electrical layer?

A.

Client side 1+1 protection

B.

ODUK SN

C.

ODUK Ring Protection

D.

SWSNCP Protection

Which of the following descriptions about optical line protection OLP are wrong?

A.

OLP can only be configured on the FIU line side of each site

B.

Single-ended switching optical line protection requires APS protocol

C.

Segmentation protects the combined optical signal, and separate routing is used between sites

D.

The OLP board is used to protect the line fiber

In the LTE service, X2 traffic forwarding between base stations needs to be enabled. Which of the following statements about the forwarding path in the x2 traffic flow is correct?

A.

X2 traffic forwarding on the same network segment does not require Layer 3 routes or interfaces

B.

For forwarding in the X2 flow between base stations on different network segments under the same L2L3 node, it is necessary to transfer between L3VE sub-interfaces

C.

Different L2L3 nodes must forward the X2 traffic with the base station to the base station, and it must be transited by the L3 node.

D.

X2 traffic forwarding between different cities requires SGW participation