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 should be implemented in the aggregation layer.D The Cisco Express Forwarding hashing algorithm is the default， based on the IP address andLayer 4 port.E Core layer should run BGP along with an IGP because iBGP has a lower administrativedistance than any IGP.
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 should be implemented in the aggregation layer.
D
The Cisco Express Forwarding hashing algorithm is the default， based on the IP address andLayer 4 port.
E
Core layer should run BGP along with an IGP because iBGP has a lower administrativedistance than any IGP.
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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.
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.
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.
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.
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 linkB. to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 linkC. to two core switches from redundant distribution switches connected with a Layer 2 linkD. to two core switches from redundant distribution switches connected with a Layer 3 linkE. to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO
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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.
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 switchesB. use a Layer 3 link between distribution switchesC. use a redundant link to the coreD. use a Layer 3 link between distribution switches with route summarization
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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.
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 andLayer 4 port.E、 Core layer should run BGP along with an IGP because iBGP has a lower administrativedistance than any IGP.
Which of these recommendations is most appropriate for the core layer in the Cisco Campus Architecture？（）A、 Utilize Layer 3 switchingB、 Utilize software accelerated servicesC、 Aggregate end users and support a feature-rich environmentD、 Perform packet manipulation and filtering at the core layerE、 Use redundant point to-point Layer 2 interconnections when where is a link or node failure.
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 linkB、 to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 linkC、 to two core switches from redundant distribution switches connected with Layer 2 linkD、 to two core switches from redundant distribution switches connected with Layer 3 linkE、 to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO
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.
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单选题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.
单选题To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus?（）Ato a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 linkBto a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 linkCto two core switches from redundant distribution switches connected with a Layer 2 linkDto two core switches from redundant distribution switches connected with a Layer 3 linkEto two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO
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单选题What is the most common cause of network congestion？（）Aaggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core-layer switchesBspeed mismatches when moving from a low-speed LAN environment to a higher speed WAN environmentCflapping Ethernet interfaces caused by misconfigured LAN interfacesDflapping serial interfaces caused by misconfigured WAN interfacesEspeed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment
单选题Company uses layer 3 switches in the Core of their network. Which method of Layer 3 switching uses a forwarding information base （FIB）？（）ATopology-based switchingBDemand-based switchingCRoute cachingDFlow-based switchingENone of the other alternatives apply
单选题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 provisionedfrom the aggregation layer.E The data center access layer provides the physical-level connections to the server resourcesand only operates at Layer 3.
单选题Which of these recommendations is most appropriate for the core layer in the Cisco Campus Architecture？（）A Utilize Layer 3 switchingB Utilize software accelerated servicesC Aggregate end users and support a feature-rich environmentD Perform packet manipulation and filtering at the core layerE Use redundant point to-point Layer 2 interconnections when where is a link or node failure.