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IEEE 802.1Q defines the structure of VLAN tags, including TPID, PRI, CR, and VLAN ID. Which of the following is used to classify service

priorities?

A.

VLAN ID

B.

CR

C.

PRI

D.

TPID

When PTN carries LTE services, it forwards packets based on MPLS label switching. In the MPLS label, which identification field can be used as a PTN to distinguish the label

at the bottom of the stack?

A.

Label ID

B.

BS

C.

EXP

D.

TTL

In the following label operation modes, which options does the PTN device support?

A.

PUSH

B.

SWAP

C.

POP

D.

PHP

Whether it is the OSI reference model or the TCP/IP protocol, the existence of the data link layer is mainly to realize which of the following functions?

A.

Bitstreaming

B.

Addressing and Routing

C.

Provide media access

D.

Establish a host end-to-end connection

OSN6800 equipment, ND2, TQX report the BUS_ERROR alarm after configuring the power cross-connect, what are the possible reasons?

A.

The crossover board, TQX board or ND2 board is faulty

B.

The TQX client side business type is set incorrectly

C.

Subrack Hardware Limitations

D.

Cross bus capacity is limited

When the scheduling granularity of the N302 board is ODUflex, what are the supported protection types?

A.

ODUk SNCP Protection

B.

Tributary SNCP Protection

C.

In-board 1+1 protection

D.

Client side 1+1 protection

100mw is roughly equal to how many dBm?

A.

13dBm

B.

15dBm

C.

20dBm

D.

10dBm

When the NE reports the TUNNEL_APS_OUTAGE alarm, what does it mean?

A.

Tunnel protection group is degraded and the availability of the protection group is reduced

B.

The tunnel protection group is interrupted, and the bearer services are interrupted

C.

The tunnel protection group is switched, and the working channel is unavailable

D.

The tunnel protection group is switched and the protection channel is

unavailable

What are the items of routing protocols based on link state algorithm?

A.

OSPF

B.

BGP

C.

ISIS

D.

RIP

Which of the following combinations of dynamic optical add/drop multiplexing boards does not hold?

A.

WSD9+WSM9

B.

RDU9+RMU9

C.

WSD9+RMU9

D.

RDU9+WSM9