领导的作用主要体现在( )方面。
A. 指挥引导作用
B. 激励鼓舞作用
C. 沟通协调作用
D. 教育培养作用
1. Why do we need both MAC address and IP addressfor a network interface? Why not just one address?
2. Why are MAC addresses f at but IP addresseshierarchical?
3. Why is netmask used inside a router and a host?