[network planning] Chapter 3 data link layer (4) LAN, Ethernet, WLAN, VLAN

Catalog

3.6-1 Basic concept and architecture of LAN

One 、 LAN

Two 、 Basic concept and architecture of LAN

3、 ... and 、 LAN transmission media

Four 、 LAN medium control method

5、 ... and 、 LAN classification

6、 ... and 、IEEE 802 standard

7、 ... and 、MAC Sublayer LLC Sublayer

summary ：

3.6-2 Ethernet

One 、 Ethernet Overview

Two 、 Ethernet provides no connection 、 Unreliable service

3、 ... and 、 The development of Ethernet transmission media and topology

Four 、10BASE-T Ethernet

5、 ... and 、 Adapter and MAC Address

6、 ... and 、 Ethernet MAC frame

7、 ... and 、 High speed Ethernet

summary ：

3.6-3 WLAN

One 、IEEE 802.11

Two 、802.11 Of MAC Frame header format

3、 ... and 、 WLAN classification

（1） WLAN with fixed infrastructure

（2） Self organizing network with fixed infrastructure wireless LAN

3.6-4 VLAN Basic concepts and principles

One 、 Limitations of traditional LAN

Two 、VLAN Basic concepts

3、 ... and 、VLAN Realization

（1） Interface based VLAN technology （ Commonly used ）

 （2） be based on MAC Of VLAN technology

Four 、VLAN Realization ——IEEE 802.1Q frame

5、 ... and 、 practice

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3.6-1 Basic concept and architecture of LAN

One 、 LAN

Two 、 Basic concept and architecture of LAN

Bus topology is optimal , Most widely used .

3、 ... and 、 LAN transmission media

Four 、 LAN medium control method

5、 ... and 、 LAN classification

6、 ... and 、IEEE 802 standard

7、 ... and 、MAC Sublayer LLC Sublayer

summary ：

3.6-2 Ethernet

One 、 Ethernet Overview

baseband signal （ Corresponding to digital signal ）： Send the digital signal 0 and 1 Directly expressed by two different voltages , Then send it to the number channel Up transfer , This transmission is called baseband transmission , Usually used in local area networks .

analog signal , digital signal , baseband signal , Broadband signal , Band signal __ Bard blog -CSDN Blog _ Baseband signal and digital signal As shown in the title, several signals are signals that appear in the computer network , And easy to confuse , Here is a simple comb . analog signal ： Shape continuity , It can be imagined as sin(x) Shape digital signal ： There are two kinds of signals transmitted discontinuously on the link ： baseband signal , Broadband signal baseband signal （ Corresponding to digital signal ）： Send the digital signal 0 and 1 Directly expressed by two different voltages , Then it is transmitted to the digital channel , This transmission is called baseband transmission . Broadband signal （ Corresponding to analog signal ）： The baseband signal is modulated to form an analog signal , And transmit on the analog channel , And this transmission ...https://blog.csdn.net/qq_32623363/article/details/88033269

Two 、 Ethernet provides no connection 、 Unreliable service

3、 ... and 、 The development of Ethernet transmission media and topology

Four 、10BASE-T Ethernet

5、 ... and 、 Adapter and MAC Address

6、 ... and 、 Ethernet MAC frame

7、 ... and 、 High speed Ethernet

summary ：

3.6-3 WLAN

One 、IEEE 802.11

Two 、802.11 Of MAC Frame header format

IBSS That is, the mobile stations in a service set do not communicate directly through the base station

To AP It is the communication between the mobile station in the service set and the base station

WDS It is the communication between two mobile stations in different service sets （ roaming ）

From AP It is the communication between the base station and the mobile station in the service set

3、 ... and 、 WLAN classification

（1） WLAN with fixed infrastructure

（2） Self organizing network with fixed infrastructure wireless LAN

3.6-4 VLAN Basic concepts and principles

One 、 Limitations of traditional LAN

Two 、VLAN Basic concepts

3、 ... and 、VLAN Realization

（1） Interface based VLAN technology （ Commonly used ）

 （2） be based on MAC Of VLAN technology

Transmission between different switches trunk port . The same VLAN Send information to the host under , If it is not under the same switch, label it .

Four 、VLAN Realization ——IEEE 802.1Q frame

5、 ... and 、 practice

Q1 Sure ,Q2 Can not be .