I. Classification of network cards
1. According to the computer types supported by the network card, it is mainly divided into standard Ethernet card and PCMCIA card: standard Ethernet card is used for desktop computer networking, while PCMCIA card is used for notebook computer.
2. According to the transmission rate classification supported by the network card, it is mainly divided into 10 MBPS network card, 100Mbps network card, 10/100 MBPS adaptive network card and 1000Mbps network card
Second, the unit problem
The 1M and 2M mentioned by the subject are different from 10/100Mbps units. In real life, there are 5M, 6M or even 10M. For specific conversion, users are advised to remember the following conversion formula:
B = 8 b 1 b/s = 8 b/s (or 1 BPS = 8 BPS)
1KB=1024B 1KB/s=1024B/s
1MB=1024KB 1MB/s=1024KB/s
Specification tip: in the actual writing specification, B should stand for Byte(Byte) and B should stand for bit(bit). However, in the practical writing at ordinary times, both bit and Byte are mixed as B, such as Mb/s and Mb/s are mixed as Mb/s, which leads to mistakes due to the confusion of units in the actual calculation.
Example: In the actual application of Internet access, when downloading software, we often see such words as download speed 128KBps(KB/s), 103KB/s and so on, because the unit of line bandwidth provided by ISP is bit, and the general downloaded software is displayed in bytes (1 byte =8 bits), so the actual value can be obtained through conversion. However, it can be converted according to the conversion formula:
128 Kb/s = 128 x 8 (Kb/s) = 1024 Kb/s = 1 MB/s or 128 Kb/s = 1 MB/s.
Three, computer network card query
Judging from the speed of the local connection
1. Click the network connection icon to open the Network and Sharing center. You can see a local connection
2. Click the local link, and in the pop-up state, the speed of 100.0 Mbit/s is 100 MBIT/s, and 1.0Gbps is 1000 MBIT/s