Area Border Router （ABR） is a router located on the border of one or more OSPF areas that connect those areas to the backbone network. An ABR will inject a default route into which two types of areas？（）
- AArea 0
- BNSSA
- CTotally stubby
- DStu
搜答案，更轻松！
Area Border Router （ABR） is a router located on the border of one or more OSPF areas that connect those areas to the backbone network. An ABR will inject a default route into which two types of areas？（）