单项选择题
How does the Ethernet Relay Service use the VLAN tag？（）
A. to provide service internetworking
B. to support transparency for Layer 2 frames
C. as a connection identifier to indicate destination
D. as a mapping to the DLCI in service internetworking
E. to provide a trunk by which all VLANs can navigate from one site to one or multiple sites
相关考题
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单项选择题
WhichuniquecharacteristicsoftheDataCenterAggregationlayermustbeconsideredbyan EnterpriseCampusdesigner？（）
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. -
单项选择题
WhendesigningtheNetworkAdmissionControl（NAC）AppliancefortheEnterpriseCampus Network，whichofthefollowingrequirementswouldhelpthedesignertonarrowdowntheNAC choices，fromVirtualGatewaytoRealIPGateway，orfromIn-bandtoOut-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 -
多项选择题
WhataretwocharacteristicsofServerLoadBalancingroutermode？（）
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
