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MindMap Gallery LAN network
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LAN network
Typical LAN: ① Network users of the ATM network can exclusively enjoy the entire bandwidth. Even if the number of computers in the network is increased, the transmission rate will not decrease; ② Since ATM data is divided into cells of equal length, it can be processed more efficiently than traditional packet switching. Easily achieve higher transmission rates.
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LAN network
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This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
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- Reproductive development of animals
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LAN technology
LAN Overview
Concepts and features
①Concept: A local area network is a computer that allows many independent computers Channel directly within the appropriate area and at the appropriate transmission rate Tong data communication system
②Features
①Small geographical coverage
②High communication speed
③Small transmission delay and low bit error rate
④ Dedicated network for easy management
⑤Easy to install and maintain, high reliability
⑥The main technical factors that affect the characteristics of LAN are transmission media and topology and media access control methods
⑦The protocol is simple, the structure is flexible, the network construction cost is low, and the cycle is short
LAN topology
①Bus type
②Star shape
③Ring shape
LAN architecture
①Physical layer (PHY)
②Media Access Control Layer (MAC)
③Logical link control layer (LLC)
IEEE 802 standard
IEEE 882.1 - Overview, architecture and network interconnection, and network management and performance measurement
IEEE 802.2 - Logical link control is the interface between high-level protocols and any LAN MAC sublayer
IEEE802.3 - CSMA/CD, defines the MAC sublayer and physical layer specifications of the CSMA/CD bus network
IEEE 802.4 - Token Bus Network
IEEE 802.5 - Token Ring Network
IEEE 802.6 - Metropolitan Area Network MAN
IEEE 802.7 - Defining Broadband Network Technology
IEEE 802.8 - Defining fiber optic network technology
IEEE802.9 - for integrated voice data LAN
IEEE 802.10 - Defining interoperable local area network security specifications
IEEE 802.11 - Defining wireless LAN standards
IEEE 802.12 - Standard for defining priority high-speed local area networks (100Mbps)
IEEE 882.14——Definition of interactive television network (Cable Modem) standard
IEEE 802.15 - Defining the standard for broadband wireless LAN
media access control method
Channel allocation problem
static allocation method
①Adopt frequency division multiplexing or time division multiplexing method Divide a single channel and statically assign it to multiple users
②Poor performance
③The traditional static allocation method is not completely suitable for computer networks
Dynamic allocation method
① Rotation: refers to each user site taking turns to get the opportunity to send
② Reservation: refers to dividing the time on the transmission medium into time slices. Users on the network If the site wants to send, it must reserve a time slot in advance.
③Content: If all user sites can compete for the medium, this technology is called contention.
media access control method
CSMA/CD
CS——Carrier monitoring
MA——Multiple Access
CD - Conflict Detection
Working principle: listen first and then speak, listen and speak at the same time, stop transmitting when conflict occurs
work process
①The station sending the information first "monitors" the channel to see if there is a signal being transmitted. If the channel is found to be busy, continue to monitor
②If the channel is free, data can be sent immediately
③The site sending the information monitors at the same time during the sending process channel to detect whether a conflict occurs
④When the sender detects a conflict, it immediately stops data transmission. and sends an "interference" signal with a length of 4 bytes to the channel to ensure Sea conflicts also found at other sites
Composition of LAN
LAN hardware system
①Server
②Network workstation
③Network adapter
④Switch
⑤Transmission medium
LAN software system
①Network operating system
①Windows Server 2008
②UNIX
③Linux
②Network database management system
③Network application software
LAN working mode
peer-to-peer network
①Definition: Peer-to-peer network can also be said to not require a server LAN, which is a distributed network system
②Applicable occasions: small offices, laboratories, etc.
③Features
①The host status is equal
②Convenient management
③ Low cost
Client/Server Mode (C/S)
①Applicable occasions: industrial and commercial enterprise network, campus network, etc.
②Features
①Clear division of labor
②Centralized management
③Good scalability
Browser/server mode (B/S)
advantage
① It has the characteristics of distribution and can be used at any time Conduct inquiries, browsing and other business processing anywhere
②Business expansion is simple and convenient, through Adding web pages increases server functionality
③Maintenance is simple and convenient, you only need to change the web page. Achieve synchronous updates for all users
④Simple development and strong shareability
shortcoming
① The personalized features are significantly reduced and it is impossible to achieve personalized functional requirements
②Using the mouse as the most basic operation method cannot meet the requirements of quick operation.
③The page is refreshed dynamically, and the response speed is significantly reduced.
④The functions are weakened and it is difficult to realize the special functional requirements under the traditional mode.
⑤The security threats faced are relatively large
Typical LAN
Traditional Ethernet
Fast Ethernet
Gigabit Ethernet
10 Gigabit Ethernet
ATM network
①Network users of the ATM network can exclusively enjoy the entire bandwidth, even if the network Increasing the number of computers does not reduce the transfer rate
② Since ATM data is divided into cells of equal length, it can be processed more efficiently than traditional Packet switching makes it easier to achieve higher transmission rates
③Able to meet the transmission needs of data, voice, video and other multimedia data at the same time
④ Can be used in WAN and LAN at the same time. There is no need to select a route. Improved WAN transmission rates
FDDINet
①The transmission medium uses optical fiber, which has good anti-interference and confidentiality
②For the sake of seniority and fault tolerance, a double-ring structure is generally used, which has high reliability.
③ It has the characteristics of large scale, low error rate and high transmission rate, and can meet the requirements of broadband applications.
④The cost is too high and it is mainly used in the backbone network of large-scale networks.
Wireless LAN
Wireless LAN standards
Purpose of wireless LAN
①Expand wired LAN
②Connect the LAN between buildings
③Achieve roaming access
④Build a temporary network
Wireless LAN transmission technology
Infrared radiation transmission technology
①Diffuse infrared wireless LAN
②Point-to-point infrared wireless LAN
spread spectrum technology
①Strong anti-interference ability
②Safety and confidentiality
③Anti-multipath interference
④Multiple address communication is possible
Wireless LAN networking method
Wireless LAN networking equipment
①Wireless access point
②Wireless router
③Wireless network card
④Antenna
switched LAN
Features
①Can provide exclusive bandwidth
②Short delay, easy to manage
③Can support multimedia communication
working principle
Classification of switches
According to network coverage
①WAN switch
②LAN switch
Divided according to transmission medium and transmission speed
①Ethernet switch
②Fast Ethernet switch
③Gigabit Ethernet switch
④10 Gigabit Ethernet switch
Divided according to application level
①Enterprise-grade switch
②Campus network switch
③Department level switch
④Workgroup switch
⑤Desktop switch
According to the structure of the switch
①Fixed port switch
②Modular switch
Divided according to the protocol layer in which the switch works
①Layer 2 switch
②Layer 3 switch
③Layer 4 switch
Divided according to whether network management functions are supported
Technical specifications of the switch
Number of ports
port speed
Number of rack slots and expansion slots
Backplane bandwidth
Supported network types
MAC address table size
Maximum number of stacks
Can be managed via network
Maximum number of SONET ports
Supported protocols and standards
buffer size