Which unique characteristics of the Data Center Aggregation layer must be considered by an Enterprise Campus designer？（） 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.。 “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.。 Load balancing， firewall service， and other network service are commonly integrated by the useof service modules that are inserted in the aggregation switched.。 Virtualization tools allow a cost effective approach for redundancy in the network design byusing two or four VDCs from the same physical switch.。
非公有制经济是我国社会主义市场经济的（）。 主要组成部分。 基础。 重要组成部分。 可有可无部分。
大型群众性活动应当在活动前（）h内进行防火检查。 2。 4。 10。 12。
原杂基
企业到期的商业承兑汇票无法收回，则需将应收票据本息一起转作（）。 应收账款。 坏账损失。 财务费用。 其他应收款。
OSI模型的哪一层负责识别和丢弃损坏的帧？（）
