1, network infrastructure-related knowledge
Architecture
C / S architecture: Client Client Server server-side
Advantages: can maximize the performance of the PC
B / S architecture: Browser Browser Server server is part of C / S structure
Advantages: a unified interface applications
Communicatively thing
Knowledge:
. 1 MAC addresses: a physical address is globally unique, similar to the ID card
2 ip address: is a four decimal point, it identifies the location in the computer network similar to the student number
3 switch communicatively :
broadcast: roar of a voice
unicast: one
multicast: many
4 arp protocol: a protocol to obtain target by target mac address ip address.
5 port: native operating system running on each program are randomly assign a port for a program on another computer can get into this program through the port
ip address + port is the only one to find a service program on a computer
6 router: connect different network segments, route
7 gateway: similar to export a LAN and an inlet
8 segments: IP address range within a LAN
9 subnet Mask: subnet mask & ip address obtained segment
10 osi five model:
application layer: http, https, ftp
transporting layer: tcp / udp four four layer switch router
network layer: ip three switches protocol router
data link layer: arp protocol bridging Ethernet switch card
The physical layer: an optical fiber cable to transmit electrical signals hub