单选题Which of the following is a characteristic of a data center core？（）AServer-to-server traffic always remains in the core layer.BThe recommended practice is for the core infrastructure to be in Layer 3.CThe boundary between Layer 2 and Layer 3 should be

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单选题

Which of the following is a characteristic of a data center core？（）

Server-to-server traffic always remains in the core layer.

The recommended practice is for the core infrastructure to be in Layer 3.

The boundary between Layer 2 and Layer 3 should be implemented in the aggregation layer.

The Cisco Express Forwarding hashing algorithm is the default， based on the IP address andLayer 4 port.

Core layer should run BGP along with an IGP because iBGP has a lower administrativedistance than any IGP.

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第1题：

Which two design recommendations are most appropriate when EIGRP is the data center core routing protocol?()

A. Summarize data center subnets.

B. Use passive interfaces to ensure appropriate adjacencies.

C. Tune the EIGRP timers to enable EIGRP to achieve quicker convergence.

D. Adjust the default bandwidth value to ensure proper bandwidth on all links.

E. Advertise a default summary route into the data center core from the aggregation layer.

参考答案：A, E

第2题：

To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus?()

A. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 link

B. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 link

C. to two core switches from redundant distribution switches connected with a Layer 2 link

D. to two core switches from redundant distribution switches connected with a Layer 3 link

E. to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO

参考答案：D

第3题：

Cisco Express Forwarding (CEF) is mainly used to increase packet switching speed, reducing the overhead and delays introduced by other routing techniques, increasing overall performance.Which of the following concerning CEF is recommended by Cisco?（）

A. Use default Layer 4 hash in core.

B. Use default Layer 3 hash in distribution.

C. Use default Layer 4 hash in distribution.

D. Use default Layer 3 hash in core and Layer 3 + Layer 4 hash in distribution layer.

参考答案：D

第4题：

Which unique characteristics of the Data Center Aggregation layer must be considered by an Enterprise Campus designer？（）

A、 Layer 3 routing between the Access and Aggregation layers facilities the ability to span VLANsacross multiple access switches， which is a requirement for many server virtualization andclustering technologies.
B、 “East-west” server-to-server traffic can travel between aggregation modules by way of the core，but backup and replication traffic typically remains within an aggregation module.
C、 Load balancing， firewall service， and other network service are commonly integrated by the useof service modules that are inserted in the aggregation switched.
D、 Virtualization tools allow a cost effective approach for redundancy in the network design byusing two or four VDCs from the same physical switch.

正确答案:D

第5题：

Refer to the exhibit. Which recommended practice is applicable?()

A. If no core layer is deployed, the design will be easier to scale.

B. If no core layer is deployed, there will be fewer cabling requirements.

C. If no core layer is deployed, the distribution switches should not be fully meshed.

D. A dedicated campus core layer is not needed for connecting fewer than five buildings.

E. A dedicated campus core layer should be deployed for connecting three or more buildings.

参考答案：E

第6题：

Which of the following is a characteristic of a data center core?()

A. Server-to-server traffic always remains in the core layer.

B. The recommended practice is for the core infrastructure to be in Layer 3.

C. The boundary between Layer 2 and Layer 3 should be implemented in the aggregation layer.

D. The Cisco Express Forwarding hashing algorithm is the default, based on the IP address and Layer 4 port.

E. Core layer should run BGP along with an IGP becauseiBGP has a lower administrative distance than any IGP.

参考答案：B

第7题：

Which two practices will avoid Cisco Express Forwarding polarization?()

A. The core layer should use default Layer 3 hash information.

B. The core layer should use default Layer 4 hash information.

C. The distribution layer should use default Layer 3 hash information.

D. The distribution layer should use default Layer 4 hash information.

E. The core layer should use Layer 3 and Layer 4 information as input to the Cisco Expressing Forwarding hashing algorithm.

F. The distribution layer should use Layer 3 and Layer 4 information as input into the Cisco Expressing Forwarding hashing algorithm.

参考答案：A, F

第8题：

Which statement about data center access layer design modes is correct?()

A. The access layer is the first oversubscription point in a data center design.

B. When using a Layer 2 loop-free design, VLANs are extended into the aggregation layer.

C. When using a Layer 2 looped design, VLANs are not extended into the aggregation layer.

D. When using a Layer 3 design,stateful services requiring Layer 2 connectivity are provisioned from the aggregation layer.

E. The data center access layer provides the physical-level connections to the server resources and only operates at Layer 3.

参考答案：A

第9题：

Which two of these are correct regarding the recommended practice for distribution layer design based on the following configuration?()

A. use a Layer 2 link between distribution switches

B. use a Layer 3 link between distribution switches

C. use a redundant link to the core

D. use a Layer 3 link between distribution switches with route summarization

参考答案：C, D

第10题：

Which two design recommendations are most appropriate when EIGRP is the data center core routing protocol?（）

A、Summarize data center subnets.
B、Use passive interfaces to ensure appropriate adjacencies.
C、Tune the EIGRP timers to enable EIGRP to achieve quicker convergence.
D、Adjust the default bandwidth value to ensure proper bandwidth on all links.
E、Advertise a default summary route into the data center core from the aggregation layer.

正确答案:A,E

单选题Which of the following is a characteristic of a data center core？（）A Server-to-server traffic always remains in the core layer.B The recommended practice is for the core infrastructure to be in Layer 3.C The boundary between Layer 2 and Layer 3 shou

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