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全面的 CCDE 400-007 考试练习题与答案，适用于 CCDE 笔试考试 | 思博网络

通过思博网络提供的全面的考试练习题和答案，可以充分准备CCDE 400-007认证考试。这些练习题和答案都是专门为CCDE笔试而设计的。这项考试，即CCDE v3.0笔试考试（题目编号：400-007），旨在评估考生以下方面的能力：能否准确理解并明确网络功能需求；能否根据功能要求来设计网络架构；能否制定实施计划；能否清晰地表达设计决策及其背后的理由。此外，该考试还考查考生在业务策略设计、控制机制、数据管理、网络设计、服务设计以及安全设计等方面的专业知识水平。您可以获取我们提供的高质量考试资料，包括历年试题、样题以及模拟考试系统。这些资料将有助于您更好地进行考前练习，确保您在CCDE笔试中取得好成绩。

问题 #1

According to this figure, it can be known that in VLAN300, 0 MAC drift occurred by 00e0-fc3d-3bdb from 17:22:38 to 17:22.44 on 2020-06-04.

A. 5

B. 65535

C. 300

D. 1

正确答案：A

问题 #2

On the same switch interface, the administrator can only configure traffic suppression for one of the following: broadcast, unknown multicast, unknown unicast, known multicast, and known unicast packets.

A. True

B. Falsecorrect

正确答案：B

问题 #3

The detection mechanism of BFD is that two systems establish a BFD session and periodically send BFD control messages along the path between them. If one party does not receive the BFD control message within a specified time, it is considered that a fault has occurred on the path. Which of the following reasons will not cause the BFD session to go Down?

A. The remote identifier and local identifier of the BFD session do not match

B. The message with UDP port number 4784 is rejected

C. The session-name of the BFD session is inconsistentcorrect

D. The outbound interface bound to the single-hop BFD session is physically faulty.

正确答案：C

问题 #4

Network maintenance can be divided into two categories: daily maintenance and troubleshooting. If the maintenance personnel have a high level of technical skills, they can maintain the network based on experience without following operating specifications.

A. True

B. Falsecorrect

正确答案：B

问题 #5

The networks of large and medium-sized enterprises can be divided into access layer, aggregation layer and core layer. Network engineers need to formulate cutover plans for any operations performed at any layer that affect the existing network services.

A. Truecorrect

B. False

正确答案：A

问题 #6

In the OSPFv3 network shown in the figure, the IPv6 address of R3 Loopback0 interface is 2000::3/128, and OSPFv3 is enabled. Which of the following descriptions are correct? (Multiple choice)

A. R2 will definitely generate a Link-LSAcorrect

B. R1 will definitely generate a Network-LSA

C. R3 will definitely generate an Intra-Area-Prefix-LSAcorrect

D. The Link-LSA generated by R2 will not appear in R1's LSDBcorrect

正确答案：ACD

问题 #7

In order to protect the BGP protocol from attacks, Keychain authentication can be used between BGP neighbors to reduce the possibility of attacks. The keychain has a set of passwords that can be automatically switched according to the configuration, which is suitable for networks with high security requirements.

A. Truecorrect

B. False

正确答案：A

问题 #8

In order to speed up the perception of link failures in the IS-IS network, IS-IS can be linked with BFD.

A. TRUE

B. FALSE

正确答案：A

问题 #9

In the OSPF network shown in the figure, the area numbers are marked in the figure, where area 1 is the Stub area, area 2 is the Totally Stub area, and area 3 is the NSSA area. By default, which of the following routers does not have a default route in its routing table?

A. R3correct

B. R5

C. R4

D. R6

正确答案：A

问题 #10

In the IS-IS network shown in the figure, R1 introduces the default route through the "default-route-advertise always level-1" command. Which of the following descriptions is wrong?

A. Ping any non-existent IP address on R1, such as 10.0.4.4. The data packet will not be sent from R1.correct

B. 10.0.1.1 can ping 10.0.3.3

C. 10.0.1.1 can ping 10.0.2.2

D. 10.0.2.2 can ping 10.0.3.3

正确答案：A

问题 #11

Which of the following information can the DHCP binding table contain?

A. port andUDPport

B. MA, Caddress

C. IPaddress

D. lease time

正确答案：BCD

问题 #12

In the OSPF network shown in the figure, the cost value of the link is marked in the figure. R1 has enabled OSPP IP FR and configured the "maximum load-balancing 8" command in the OSPF process. Which of the following is the cost value of reaching 10.0.35.0/24 in R1's routing table?

A. 10

B. 30correct

C. 20

D. 40

正确答案：B

问题 #13

As shown in the figure, all routers run OSPF. Which of the following statements is correct?

A. R2 generates Router LSA in both area 1 and area 0

B. R2 forwards the Router LSA generated by R3 to R1

C. R2 forwards the Router LSA generated by R1 to R3

D. R2 only generates Router LSA in area 0

正确答案：A

问题 #14

If the migration preparation is insufficient, which of the following problems may occur? Options (Multiple Choice):

A. When an interface cannot go up but no network cable tester is available, it is difficult to determine whether the interface hardware or cable is faulty.

B. The migration fails, and the configuration file is not backed up. As a result, the service rollback fails.

C. A hardware fault occurs on a board, but no spare board is available.

D. Engineers cannot arrive at the migration site at the scheduled time.

正确答案：ABCD

问题 #15

As shown in the figure, a certain park has deployed IPv6 for service testing, and there are 4 routers in the network. Run OSPFv3 to realize network interconnection. Regarding the LSA generated by the OSPFv3 network, which of the following statements is wrong?

A. R1 itself will generate Router-LSA to describe device interface information, and will receive Router-LSA generated by R2 and R3 at the same time

B. There is a Network LSA generated by R3 in the LSDB of R1, indicating that R3 may be the DR of this link

C. R1 will receive the two Link-LSAs generated by R2, describing the two links information connected to The safer, easier way to help you pass any IT exams. 4 / 86 R2 respectively

D. As an ABR, R2 will generate Inter-Area-Prefix-LSA describing the IPv6 address prefix of Area 1, and advertise it to R1 and R3

正确答案：C

问题 #16

The Router ID of R4 is 10.0.4.4. In the LSDB of R4, the LSA shown in the figure is seen. The network engineer makes the following inferences based on the LSA. Which one is wrong?

A. This LSA is generated by R4

B. R4 has two OSPFv3 neighbors

C. R4 is the DR on both links

D. R4 does not support importing external routes into OSPFv3correct

正确答案：D

问题 #17

A. Truecorrect

B. False

正确答案：A

问题 #18

The Link-LSA generated by an OSPFv3 router is shown in the figure. Which of the following is the number of global unicast addresses configured on the interface?

A. 4

B. 3correct

C. 1

D. 2

正确答案：B

问题 #19

The OSPF protocol requires routers in the same area to save the same link state database LSDB. As the number of routes on the network continues to increase, some routers cannot carry so much routing information due to limited system resources. This state is called database overload. If all routers in an OSPE network are configured with "Isdb-overf1low-limit number 7", which of the following scenarios may cause the router to enter the Overflow state? (Multiple choice)

A. The number of Type 5 LSAs exceeds 7correct

B. The number of Type 3 LSAs exceeds 7

C. The number of Type 4 LSAs exceeds 7

D. The number of Type 7 LSAs exceeds 7correct

正确答案：AD

问题 #20

In a BGP/MPLS IP VPN network, VPNv4 routing transfers carry Export RT values. Which of the following path attributes does MP-BGP use to carry Export RT?

A. Extended Communitycorrect

B. AS Path

C. Local Preference

D. MP_REACH_NLRI

正确答案：A

问题 #21

Which of the following operations does a network engineer not need to perform when processing a single-hop BFD session Dom?

A. Repeat the display bfd statistics session all command to view the statistics of the BFD session sent and received packets.

B. If a static route is bound to a BFD session, run the display ip routing-tab1e command to check whether the static route exists in the routing table.

C. Run the display current-configuration configuration bfd command to check whether the local discriminator and remote discriminator at both ends of the BFD session match.correct

D. Ping the link between the BFD sessions to check whether forwarding is normal.

正确答案：C

问题 #22

Which is wrong with this configuration description?

A. If there is no SubOption information of Option82 in the DHCP request packet received by GigabitEthemnet0/0/1 interface, the device will generate Option82correct

B. Enabling DHCP Snooping configuration can be used to prevent DHCP Server bogus attacks

C. Configure the GigabitEthernet0/0/1 interface as a trusted interface

D. Enable DHCP Snooping configuration can be used to prevent ARP spoofing attacks

正确答案：A

问题 #23

When there are multiple redundant links in the IS-S network, multiple equal-cost routes may appear. Regarding equal-cost routes in an IS-IS network, which of the following descriptions is wrong?

A. When the number of equal-cost routes in the networking is greater than the number configured through commands, and the priorities of these routes are the same, the route with the higher System ID of the next hop device is preferred for load sharing.

B. If negative arbitration sharing is configured, the traffic will be evenly distributed to each link.

C. After the equal-cost routing priority is configured, when the IS-IS device forwards the traffic that reaches the destination network segment, it will not adopt the load sharing method, but will forward the traffic to the next-hop with the highest priority.

D. For each route in the equal-cost route, the priority can be specified, and the route with the higher priority will be preferred. The rest are used as backup routes.

正确答案：C

问题 #24

In the OSPF network shown in the figure, R1 and R2 achieve intercommunication through Loopback0 interface through OSPF. At the same time, R1 and R2 have enabled the MPLS LDP function, and the LDP transmission address is the IP address of the Loopback0 interface. The network engineer found that R1 and R2 could not establish an LDP session, so he first executed the command shown in the figure on R2. Based on this, which of the following reasons may cause the failure of establishing an LDP session between R1 a

A. R2 GE0/0/1 interface refuses to receive packets with a destination IP address of 224.0.0.2correct

B. R1 GE0/0/1 interface refuses to receive packets with a destination IP address of 224.0.0.5

C. R2 GE0/0/1 interface refuses to receive packets with source IP address 10.0.12.1

D. R1 GE0/0/1 interface refuses to receive packets with TCP destination port 646correct

正确答案：AD

问题 #25

As shown in the figure, RIR4 is one of the four routers in AS 123. They all run OSPE and realize the routing interconnection within the AS. Among them, the two network segments 10.1.1.0/24 and 10.4.4.0/24 are not published to OSPF. Now, R1 and R4 have established an IBGP peer relationship based on the Loopback0 interface, and published the network segments 10.1.1.0/24 and 10.4.4.0/24 to BGP respectively. Which of the following methods can enable PC1 and PC2 to communicate with each other? (Multiple choice)

A. Deploy policy routing on R1 and specify R2 as the next hop for traffic from PC1 to PC2.correct

B. Run BGP on R2 and R3 and establish IBGP full interconnection in AS123correct

C. On R1 and R4, import routes 10.1.1.0/24 and 10.4.4.0/24 into OSPF respectively.correct

D. Activate MPLS and LDP on R1~R4 and establish LSPs for routes 1.1.1.1/32 and 4.4.4.4/32.correct

正确答案：ABCD

问题 #26

When creating an IPv6 static route, for a point-to-point interface, the outbound interface must be specified. For a broadcast type interface, the next hop must be specified.

A. True

B. Falsecorrect

正确答案：B

问题 #27

According to this picture, we can judge:

A. The system ID of R1 is ee8c.a0c2.baf1correct

B. R1 has both level1-1 and level-1-2 dimension information

C. R1 only has link status information of level1-2

D. In the leve1-2 network, there are a total of 8 routers

正确答案：A

问题 #28

As shown in the figure:

A. There is Type 5 LSA flooding in Area2

B. There is no Type 3 LSA flooding in Area2

C. There is Type 5 LSA flooding in Area1

D. There is no Type3 LSA flooding in Area1

正确答案：D

问题 #29

If you want to check the files under Flash, which command should you use?

A. dir sdl

B. dir sd0

C. display patch-information

D. dir flashcorrect

正确答案：D

问题 #30

As shown in the figure:

A. The LSA in the figure is generated by this router

B. The destination network described by this LSA is 10.0.23.0/24

C. The type of the LSA is AS-exterma1-LSA

D. This device is ABR

正确答案：B

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