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2026年CCNP 350-401考试备考：模拟试题与学习资料，思科企业网络核心考试 | 思博网络

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问题 #1

The physical layer of LAN is often used for the interconnection of routers and switches. Although it is called a local area network, if a 10GBase-LR or -ER optical module is used, the transmission distance can reach 80 kilometers.

A. Truecorrect

B. False

正确答案：A

问题 #2

Which of the following descriptions are correct? (Multiple choice)

A. The difference between a 1+1 linear multiplex section and a 1:1 linear multiplex section is whether APS is required.correct

B. The 1:1 linear multiplex section can be equipped with additional services, and its switching mode is only double-ended recovery switching.correct

C. Whether it is a two-fiber bidirectional MSP ring protection ring or a four-fiber bidirectional MSP ring, there are requirements for the nodes in the ring. The main reason is that it is determined by the K1 and K2 bytes in the APS protocol.correct

D. The APS protocol of the four-fiber bidirectional multiplex section protection ring is carried by the protection optical fiber.correct

E. The protection mode of SNCP protection is " double transmission, selective reception", which is especially suitable for decentralized services.

正确答案：ABCD

问题 #3

Which of the following are the electrical-layer overheads of OTN? (Multiple Choice)

A. OPUkcorrect

B. ODUkcorrect

C. OCh

D. OTUkcorrect

正确答案：ABD

问题 #4

Which of the following statements is incorrect.

A. In the connection model of MPLS VPN, the network is composed of the backbone network of the operator and each site of the user. The so-called VPN is the division of a site set, and a VPN corresponds to a set composed of several sites.correct

B. The network construction of MPLS VPN is completed by the service provider. In this network structure, the service provider provides VPN services to users, and users do not feel the existence of a public network, as if they have independent network resources.

C. For the backbone routers inside the backbone network of the service provider, that is, the routers that are not directly connected to the edge routers, they do not know the existence of the VPN, and are only responsible for data transmission within the backbone network.

D. All VPN construction, connection and management work is carried out on the backbone router.correct

正确答案：AD

问题 #5

If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex to full-duplex may occur.

A. Truecorrect

B. False

正确答案：A

问题 #6

How many 2M business work boards does OSN 7500 support at most? Which of the following is correct?

A. 1

B. 2

C. 3

D. 4correct

正确答案：D

问题 #7

The dual fiber ring topology consisting of three network elements is arranged in counterclockwise order as the service between A, B and C A and C occupies the first VC-48 on the short path VC-12 time slots, B and C of the same service also occupy the 48th of the first VC-4 on the short path VC-12 time slots

A. AUnidirectional path protection ring

B. BSNCP ring

C. CBidirectional MSP ring

D. DAll of the above

正确答案：C

问题 #8

The half-duplex mode must have a collision detection and avoidance mechanism to avoid the situation where multiple devices seize the line at the same time. This mechanism is the so-called CSMA/CD, and the Chinese name is carrier sense multiple access/collision detection .

A. Truecorrect

B. False

正确答案：A

问题 #9

The SDH frame structure is a rectangular block frame based on which of the following options?

A. Bytescorrect

B. Bit

C. Block D frame

正确答案：A

问题 #10

Which of the following statements is wrong?

A. In the MPLS VPNE connection model, the network consists of the operator's backbone network and the user's various sites. The so-called VPN is the division of a set of sites. One VPN corresponds to a set of several sites.

B. The network construction of MPLS VPN is completed by the service provider. In this network construction, the service provider provides VPN services to users, and users do not feel the existence of the public network, as if they have independent network resources.

C. The backbone routers within the service provider's backbone network, that is, the routers that are not directly connected to the edge routers, are unaware of the existence of the VPN and are only responsible for data transmission within the backbone network.

D. All VPN construction, connection and management are performed on backbone routers.correct

正确答案：D

问题 #11

Which of the following is not included in the basic architecture of MPLS L2VPN?

A. ACcorrect

B. VC

C. Tunnel

D. S-VLANcorrect

正确答案：AD

问题 #12

Compared with a dense wavelength division multiplexing (DWDM) system, a coarse wavelength division multiplexing (CWDM) system provides a certain number of wavelengths and a transmission distance within ( ) km, which greatly reduces system cost and has strong flexibility.

A. 50

B. 100correct

C. 200

D. 20

正确答案：B

问题 #13

QinQ technology can be interpreted as 802.1Q in 802.1Q, in other words, a layer of 802.1Q label is added on top of the 802.1Q label , the outer layer is C-VLAN and the inner layer is S-VLAN , two bytes more than a normal 802.1Q frame .

A. True

B. Falsecorrect

正确答案：B

问题 #14

For an OSN 3500, which of the following boards provides the centralized backup function for the +3.3 V power supply of each board in the subrack?

A. AUX

B. COA

C. SCC

D. PIU

正确答案：A

问题 #15

R-LOS, R-LOF, AU-AIS, TU-AIS alarms are all generated and reported on the circuit board.

A. True

B. Falsecorrect

正确答案：B

问题 #16

Which of the following descriptions about multiplexing is correct? During byte interleaving multiplexing, the information payload and pointer bytes of each frame are interleaved and multiplexed according to the original values, and the segment overhead is also multiplexed accordingly.

A. STM-4 has 4 times the overhead of STM-1

B. The overhead in STM4 is newly integrated into only one set of overheadcorrect

C. The overhead number in STM-4 is the same as that in STM-1

D. Random generation of overhead in STM-4

正确答案：B

问题 #17

If SNCP services with the same source, sink or route are grouped, the SNCP switching speed can be improved.

A. Truecorrect

B. False

正确答案：A

问题 #18

OSN 3500 branch line business has strong up and down capabilities, with 16 branch line outlet slots, 504 2M, 32 E4, 117 E3/DS3, 132 STM-1e up and down subracks, providing STM-1/4/ 16/64 group rate.

A. Truecorrect

B. False

正确答案：A

问题 #19

FAS is the frame alignment overhead with a length of 6 bytes. The 1st to 3rd bytes are 3 OA1 bytes, each OA1 is always "1111 0110"; the 1st to 6th bytes are 3 OA2 bytes, each OA2 is always "0010 1000". OA1 and OA2 are the frame alignment bytes of this frame signal, which are equivalent to A1 A2 in the SDH frame structure.

A. Truecorrect

B. False

正确答案：A

问题 #20

Which of the following are VLAN classification methods? (Multiple Choice)

A. By protocol

B. By subnet

C. By port

D. By MAC address

正确答案：ABCD

问题 #21

The STAT indicator of the SDH board flashes red, lights up for 100ms, and turns off for 100ms. Which of the following means the state of the metric?

A. AHardware mismatch

B. BHardware failure

C. CNormal operation

D. DThere is no power input

正确答案：A

问题 #22

When the bridge uses IVL learning mode, an entry in the MAC address table is created based on the original MAC address and original port of the data frame. This entry applies to all VLANs

A. True

B. Falsecorrect

正确答案：B

问题 #23

Which of the following is the maximum number of OSN 3500 subracks that can be installed in a 2.2 m cabinet?

A. 1

B. 3

C. 2

D. 4

正确答案：C

问题 #24

OChr means using electrical monitoring technology

A. Truecorrect

B. False

正确答案：A

问题 #25

The Ethernet board has an external port (Port) and an internal port (VCTRUNK). The external port can set the Tag attribute, but the internal port cannot set the Tag attribute.

A. True

B. Falsecorrect

正确答案：B

问题 #26

Which of the following boards supports the QinQ function?

A. EFT8

B. EGT2

C. EMS4correct

D. EMR2

正确答案：C

问题 #27

Which of the following statements about the optical-layer interfaces OTM-n.m and OTM-nr.m of OTN is incorrect?

A. n indicates the number of wavelengths carried by the maximum capacity,

B. m indicates the rate. The value can be 1, 2, or 3.correct

C. r indicates OTM without the OSC function..

D. OTM-nr.m with OSC signals is OTM-n.m.

正确答案：B

问题 #28

The SDH network is composed of multiple network nodes (network elements) connected to each other through optical fibers; network topology generally refers to the shape of the network, that is, the geometric arrangement of network nodes and transmission lines, which reflects the logical connection of the network.

A. True

B. Falsecorrect

正确答案：B

问题 #29

In Ethernet, the frame length has a lower limit, which is mainly due to which of the following considerations?

A. Carrier Sense

B. Multi-point access

C. Conflict detectioncorrect

D. Improve network bandwidth utilization

正确答案：C

问题 #30

The working mode of a port determines the flow control mode of the port. When the working mode is 100 Mbit/s full duplex, which of the following flow control modes can be used?

A. Auto-negotiation flow control mode

B. Non-auto-negotiation flow control modecorrect

C. Both of the above

D. None of the above

正确答案：B

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