9、 Networking technology

Switch Foundation

Switch classification ：

Store and forward switching ：CRC check 、 Accept data frames completely ,ASIC Hardware implementation （ Hard exchange , Soft route ）

Straight through switching ： There is a risk of bad frame propagation , Don't check

Fragment filter exchange ： The packet length is greater than or equal to 64 byte , Otherwise, it is a fragment of conflict .

Two-layer switch , Three layer switch , Multi layer switch （ insert FW,LB,IPS card ） Hua three , Depp

Fixed port switch ,

24 Port access switch ,24 Port down electric port ＋4 Smooth mouth

48 Port access switch ,48 Port down electric port ＋4 Smooth mouth

Modular switch

Access switch 、 Convergence switch 、 Core switch

Switch performance parameters

Port type ：RJ45 Electric port , Smooth mouth

transmission mode ： Half duplex , full duplex

exchange capacity ： Number of ports * Port rate * 2

Such as ：48 Gigabit electric port ＋4 Gigabit optical port （48*1G+4*1G）*2 = 104G

Packet forwarding rate ： Send per unit time 64 Number of byte packets

MAC Number of addresses

VLAN Table item ： Switch support 4094 individual

Router foundation

Wide area network WAN Interface , LAN LAN port

RJ45 mouth ： Ethernet port

Serial A serial port ： Used to connect to DDN,FR,X.25,PSTN The Internet

ISDN BRI/PRI Interface

SDN POS Interface ：155M

Switch and router management

Console Interface

Telnet/SSH

Router serial port is usually a point-to-point connection

Ethernet can also be point to multipoint