计算机网络有光猫和路由器
WiFi怎么划分VLAN（房间）
思科模拟器：信息嵌入
交换机（switch）：是一种用于电光信号转发的网络设备，可以接入交换机的任意两个网络节点提供独享的电信号通路，最常见的交换机是以太网交换机。
单模：支持几百公里的信号传输
多模：支持几公里的信号传输
单模光纤和多模光纤的最远传输距离：
光模块：光模块的作用就是光电转换，发送端把电信号转换成光信号，通过光纤传送后，接收端再把光信号转换成电信号。
switch>：一般用户模式，输入enable
switch#：特权模式，输入configure terminal
switch（config）#：全局配置模式，输入interfaceEthernet0/1
switch（config-vlan）#：VLAN接口模式，输入exit
实战：寝室划分VLAN
四台PC
四台笔记本，四台手机，一个路由器，一个平板电脑。
中继器：物理层，实现流的转发
比特流，物理层；数据链路层，帧 ；网络层，数据报
接收端接收到数据报丢失了发送端不会再次转发。
A类：1-126.0.0.1
B类：128.0.0.1-191.225.0.1
C类：192.0.0.1-223.255.255.0
单交换机：
一般用户模式进入特权模式输入enable
进入全局配置模式，configure terminal
网络拓扑图
show ?
show version
show mac-address-table
show flash:
hostname 0129
进入接口模式，interface f0/1,限速
speed 100
speed aute
vlan 5
name 12
exit
vlan 10
name 345
vlan 隔离
interface fastEthernat0/1
switchchport access vlan 5
interface fastEthernat0/2
switchchport access vlan 5
interface fastEthernat0/3
switchchport access vlan 10
interface fastEthernat0/4
switchchport access vlan 10
interface fastEthernat0/5
switchchport access vlan 10
interface fastEthernat0/6
switchchport access vlan 10
PC0不能互ping通PC345
双交换机：
至少四台PC
etherchannel EtherChannel information
flash: display information about flash: file system
history Display the session command history
interfaces Interface status and configuration
ip IP information
mac-address-table MAC forwarding table
mls Show MultiLayer Switching information
privilege Show current privilege level
sessions Information about Telnet connections
tcp Status of TCP connections
terminal Display terminal configuration parameters
users Display information about terminal lines
version System hardware and software status
vlan VTP VLAN status
vtp VTP information
Switch>show
% Incomplete command.
Switch>en
Switch#show
% Incomplete command.
Switch#show ?
access-lists List access lists
arp Arp table
boot show boot attributes
cdp CDP information
clock Display the system clock
dtp DTP information
etherchannel EtherChannel information
flash: display information about flash: file system
history Display the session command history
hosts IP domain-name, lookup style, nameservers, and host table
interfaces Interface status and configuration
ip IP information
logging Show the contents of logging buffers
mac-address-table MAC forwarding table
mls Show MultiLayer Switching information
port-security Show secure port information
privilege Show current privilege level
processes Active process statistics
running-config Current operating configuration
sessions Information about Telnet connections
snmp snmp statistics
spanning-tree Spanning tree topology
startup-config Contents of startup configuration
storm-control Show storm control configuration
tcp Status of TCP connections
tech-support Show system information for Tech-Support
terminal Display terminal configuration parameters
users Display information about terminal lines
version System hardware and software status
vlan VTP VLAN status
vtp VTP information
Switch#show
% Incomplete command.
Switch#show ver
Switch#show ver
Switch#show version
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA4, RELEASE SOFTWARE(fc1)
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Wed 18-May-05 22:31 by jharirba
Image text-base: 0x80010000, data-base: 0x80562000
ROM: Bootstrap program is is C2950 boot loader
Switch uptime is 18 minutes, 40 seconds
System returned to ROM by power-on
Cisco WS-C2950T-24 (RC32300) processor (revision C0) with 21039K bytes of memory.
Processor board ID FHK0610Z0WC
Last reset from system-reset
Running Standard Image
24 FastEthernet/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)
63488K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 0000.0CA6.0443
Motherboard assembly number: 73-5781-09
Power supply part number: 34-0965-01
Motherboard serial number: FOC061004SZ
Power supply serial number: DAB0609127D
Model revision number: C0
Motherboard revision number: A0
Model number: WS-C2950T-24
System serial number: FHK0610Z0WC
Configuration register is 0xF
Switch#
Switch#
Switch#show mac
Switch#show mac-address-table
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
Switch#
Switch#
Switch#show fla
Switch#show flash:
Directory of flash:/
1 -rw- 3058048 <no date> c2950-i6q4l2-mz.121-22.EA4.bin
64016384 bytes total (60958336 bytes free)
Switch#
Switch#
Switch#conf
Switch#configure t
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#show ?
% Unrecognized command
Switch(config)#show exit
^
% Invalid input detected at '^' marker.
Switch(config)#exit
Switch#
%SYS-5-CONFIG_I: Configured from console by console
Switch#conf
Switch#configure t
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#hostn
Switch(config)#hostname 0129my
0129my(config)#inter
0129my(config)#interface f0/1
0129my(config-if)#speed 100
0129my(config-if)#speed 10
0129my(config-if)#speed aute
^
% Invalid input detected at '^' marker.
0129my(config-if)#spe
0129my(config-if)#speed su
0129my(config-if)#speed au
0129my(config-if)#speed auto
0129my(config-if)#sp
0129my(config-if)#spe
0129my(config-if)#speed 10
0129my(config-if)#spee
0129my(config-if)#speed a
0129my(config-if)#spee
0129my(config-if)#speed au
0129my(config-if)#speed auto
0129my(config-if)#exit
0129my(config)#vlan 5 n
^
% Invalid input detected at '^' marker.
0129my(config)#vla
0129my(config)#vlan 5 n
^
% Invalid input detected at '^' marker.
0129my(config)#vl
0129my(config)#vlan 5
0129my(config-vlan)#name 12
0129my(config-vlan)#exit
0129my(config)#vla
0129my(config)#vlan 10
0129my(config-vlan)#name 345
0129my(config-vlan)#exit
0129my(config)#inter
0129my(config)#interface fast
0129my(config)#interface fastEthernet0/1
0129my(config-if)#swi
0129my(config-if)#switchport acc
0129my(config-if)#switchport access vlan 5
0129my(config-if)#exit
0129my(config)#inter
0129my(config)#interface fast
0129my(config)#interface fastEthernet0/2
0129my(config-if)#sw
0129my(config-if)#switchport acc
0129my(config-if)#switchport access vlan 5
0129my(config-if)#exit
0129my(config)#inter fa
0129my(config)#inter fastEthernet0/3
0129my(config-if)#sw
0129my(config-if)#switchport acc
0129my(config-if)#switchport access vlan 10
0129my(config-if)#exit
0129my(config)#inter
0129my(config)#interface fas
0129my(config)#interface fastEthernet0/4
0129my(config-if)#sw
0129my(config-if)#switchport acc
0129my(config-if)#switchport access vlan 10
0129my(config-if)#exit
0129my(config)#inter
0129my(config)#interface fas
0129my(config)#interface fastEthernet0/5
0129my(config-if)#sw
0129my(config-if)#switchport ac
0129my(config-if)#switchport access vlan 10
0129my(config-if)#exit
0129my(config)#