日韩欧美亚洲 _ 欧美亚洲一区 _ 日本亚洲欧美 _ 亚洲精品欧美 国产白袜脚足J棉袜在线观看_亚洲熟妇av一区二区三区_久久天天躁狠狠躁夜_精品众筹模特私拍在线

單項選擇題

IP routing protocols， such as OSPF and Enhanced EIGRP， are used primarily in network designs that contain entry and exit points to the network from service providers. What is a common trait of IP routing  protocols？（）  

A. They add needed overhead in smaller deployments.
B. They are essential for optimum and redundant forwarding.
C. They are used primarily in larger network designs，to support different networks and single entry and  exit points.
D. They are usually necessary in smaller deployments.

微信掃碼免費搜題