简述设计类型的划分及其原理
Before inserting a new switch in the network，the network administrator checks that the VTP domain name is correct，the VTP mode is set to server， and revision is lower than the switches in the network. The administrator then configures interfaces and trunks，erases existing VLANs，and connects the switch to the network. Following that procedure，there is no connectivity in the network. What is a possible cause of this problem？（） ["Because the configuration revision of the new switches is lower than the rest of the network， it can change the VLAN database of the other switches.","As a VTP server， the new switch deleted all VLANs of the network.","Erasing VLANs increases the VTP configuration revision.","Since the configuration revision of the network is higher than the new switch， the VLAN database was automatically synchronized."]
1850 TSS-320平台支持以下哪几种城域以太网业务（） ["MEFE-LINE：点到点以太网业务，类似于IETF的虚拟专线业务（VPWS）","MEFE-LAN：类似于IETF的虚拟专网业务（VPLS）","高速因特网接入（HSI）：通过以太网的直接宽带因特网访问","广播和H&S广播：传送IPTV等广播业务（有\/无上行控制信道）"]
简述人本文化的3P表述。
某公司股票每年分红2元，当前投资股票的必要收益率为10%，该股票的理论价值为（）。 [" 25"," 0.2"," 20"," 2.2"]
加速装置的功用是什么？
