Which of the following is true regarding Label Distribution Protocol （LDP）？（） ["It is a label distribution protocol for MPLS","It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a network","Tag distribution Protocol （TDP） was the basis for LDP","All of the above are true"]
简述类比与对比的关系。
在 Windows 2003/2008 下，可查看网卡 MAC 地址配置信息的命令是（） [" ping"," ipconfig"," dir","都不是"]
建设现代营销服务体系，应坚持和落实哪些基本原则？
多媒体
颗粒酒花
