单项选择题
PE1 has connections to VPN sites that are served by three remote PE routers. How many LSPs must be established to support 2547bis?（）
A. an LSP for each local CE device B. an LSP for each remote PE device C. an LSP for each remote CE device D. an LSP for each CE facing interface
单项选择题 Which command clears the history of BGP damped routes?（）
单项选择题 Which well-known community prevents a BGP speaker from announcing the associated prefix to itsinternal peers?（）
单项选择题 What is the function of the helper router during a restart event in OSPF?（）
