单选题What is the function of the Type 4 LSA?（）A Advertise cost to the ABR.B Summarize external routes.C Advertise cost to the ASBR.D Report a broadcast segment's DR
题目
单选题
What is the function of the Type 4 LSA?（）
A
Advertise cost to the ABR.
B
Summarize external routes.
C
Advertise cost to the ASBR.
D
Report a broadcast segment's DR