单项选择题
A. R1 is configured with an area 0 virtual - link 4.4.4.4 cost 3 command.
B. The ping 4.4.4.4 command on R1 must currently be successful.
C. R1's Fa0/0 OSPF cost is 3.
D. 4.4.4.4 is known to R1 based on a Type 1 LSA in area 1.
单项选择题 ABR R1 has been configured with an area 1 stub no - summary command. Which stubby area type is area 1?（）
多项选择题 Which of the following is true about routers internal to a totally NSSA area?（）
单项选择题 Router R1, an ASBR connected to the Internet and to backbone area 0, has been configured with a default - information originate command. Which of the following is true about the effects of this configuration command?（）