有些朋友问网络工程师成长日记小编问到CCNA一般要学习多长时间呢，学习的难度怎么样
思科的CCNA考试现在的编号是200-301，考试费用是195美元，
考试的大纲大概是这样的：
Identify the components of a computer network and describe their basic characteristics Understand the model of host-to-host communication Describe the features and functions of the Cisco Internetwork Operating System (IOS®) software Describe LANs and the role of switches within LANs Describe Ethernet as the network access layer of TCP/IP and describe the operation of switches Install a switch and perform the initial configuration Describe the TCP/IP Internet layer, IPv4, its addressing scheme, and subnetting Describe the TCP/IP Transport layer and Application layer Explore functions of routing Implement basic con