单项选择题
Which address is the IPV6 all-RIP-routers muticast group address that is used by RIPng as the destaion address?（）
A. FF02::A B. FF05::101 C. FF02::9 D. FF02::6
单项选择题 Which statement is true, as relates to classful or classless routing?（）
单项选择题 Which device might be installed at a branch office to enable and manage an IPsec site-to-site VPN?（）
单项选择题 At which layer of the OSI model is RSTP used to prevent loops?（）
