單項選擇題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.


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1.單項選擇題When designing the Network Admission Control （NAC） Appliance for the Enterprise Campus Network， which of the following requirements would help the designer to narrow down the NAC choices， from Virtual Gateway to Real IP Gateway， or from In-band to Out-band？（）

A. QoS ToS/DSCP values are required to be forwarded transparently
B. Device redundancy is required
C. Per-user ACL support is required
D. Multicast service support is required

2.多項選擇題What are two characteristics of Server Load Balancing router mode？（）

A. The design supports multiple server subnets Cisco 642-874： Practice Exam
B. An end-user sees the IP address of the real server
C. SLB routes between the outside and inside subnets
D. The source or destination MAC address is rewritten， but the IP addresses left alone
E. SLB acts as a "bump in the wire" between servers and upstream firewall or Layer 3 devices

3.多項選擇題Which two statements about SCSI are true？ （）

A. The bus is limited to 32 devices
B. It is a full duplex serial standard
C. It is a half-duplex serial standard
D. It allows up to 320 MB/s of shared channel bandwidth

4.多項選擇題Which two statements about layer 3 access designs are correct？（）

A. IP address space is difficult to manage.
B. Broadcast and fault domains arc increased
C. Convergence time is fractionally slower than STP
D. Limits on clustering and NIC teaming are removed
E. Fast uplink convergence is supported tor failover and fallback

5.單項選擇題When is a first-hop redundancy protocol needed in the distribution layer？（）

A. when the design implements Layer 2 between the access arid distribution blocks
B. when multiple vendor devices need to be supported
C. when preempt tuning of the default gateway is needed
D. when a robust method of backing up the default gateway is needed
E. when the design implements Layer 2 between the access switch and the distribution blocks
F. when the design implements Layer 2 between the access and distribution blocks