单项选择题
A. Branch-Router2 is configured to send both RIPv1 and RIPv2 updates.
B. Gateway-Router is configured to only receive RIPv2 updates.
C. Gateway-router is configured to receive only RIPv1 updates.
D. Branch-Router1 is configured to only send RIPv1 updates
单项选择题 which address range efficiently summarizes the routing table of the addresses for router main?（）
单项选择题 assuming the default switch configuration which vlan range can be added modified and removed on a cisco switch?（）
单项选择题 which command is used to enable CHAP authentication whit PAP as the fallback method on a serial interface?（）