receiver802.11g
802.11g 时间:2021-05-19 阅读:(
)
802.
11WirelessLANProvidesnetworkconnectivityoverwirelessmediaAnAccessPoint(AP)isinstalledtoactasBridgebetweenWirelessandWiredNetworkTheAPisconnectedtowirednetworkandisequippedwithantennaetoprovidewirelessconnectivityLANTechnologiesNetworkconnectivitytothelegacywiredLANDesktopwithPCI802.
11LANcardLaptopwithPCMCIA802.
11LANcardAccessPoint802.
11WirelessLANRange(DistancebetweenAccessPointandWLANclient)dependsonstructuralhindrancesandRFgainoftheantennaattheAccessPointToservicelargerareas,multipleAPsmaybeinstalledwitha20-30%overlapAclientisalwaysassociatedwithoneAPandwhentheclientmovesclosertoanotherAP,itassociateswiththenewAP(Hand-Off)Threeflavors:802.
11b802.
11a802.
11gLANTechnologiesMultipleAccesswithCollisionAvoidance(MACA)BeforeeverydatatransmissionSendersendsaRequesttoSend(RTS)framecontainingthelengthofthetransmissionReceiverrespondwithaCleartoSend(CTS)frameSendersendsdataReceiversendsanACK;nowanothersendercansenddataWhensenderdoesn'tgetaCTSback,itassumescollisionLANTechnologiessenderreceiverothernodeinsender'srangeRTSCTSACKdataothernodeinreceiver'srangeWLAN:802.
11bThemostpopular802.
11standardcurrentlyindeployment.
Supports1,2,5.
5and11Mbpsdataratesinthe2.
4GHzISM(Industrial-Scientific-Medical)bandLANTechnologiesWLAN:802.
11aOperatesinthe5GHzUNII(UnlicensedNationalInformationInfrastructure)bandIncompatiblewithdevicesoperatingin2.
4GHzSupportsDataratesupto54Mbps.
LANTechnologiesWLAN:802.
11gSupportsdataratesashighas54Mbpsonthe2.
4GHzbandProvidesbackwardcompatibilitywith802.
11bequipmentLANTechnologiesRepeater,HUB,Bridge&SwitchREPEATER,HUB,BRIDGEANDSWITCHRepeaterArepeaterreceivesasignal,regeneratesit,andpassesiton.
Itcanregenerateandretimenetworksignalsatthebitleveltoallowthemtotravelalongerdistanceonthemedia.
ItoperatesatPhysicalLayerofOSITheFourRepeaterRulefor10-MbpsEthernetshouldbeusedasastandardwhenextendingLANsegments.
ThisrulestatesthatnomorethanfourrepeaterscanbeusedbetweenhostsonaLAN.
Thisruleisusedtolimitlatencyaddedtoframetravelbyeachrepeater.
Repeater,Hub,Bridge&SwitchHubHubsareusedtoconnectmultiplenodestoasinglephysicaldevice,whichconnectstothenetwork.
Hubsareactuallymultiportrepeaters.
Usingahubchangesthenetworktopologyfromalinearbus,toastar.
Withhubs,dataarrivingoverthecablestoahubportiselectricallyrepeatedonalltheotherportsconnectedtothesamenetworksegment,exceptfortheportonwhichthedatawassent.
Repeater,Hub,Bridge&SwitchBridgeBridgesareusedtologicallyseparatenetworksegmentswithinthesamenetwork.
TheyoperateattheOSIdatalinklayer(Layer2)andareindependentofhigher-layerprotocols.
Thefunctionofthebridgeistomakeintelligentdecisionsaboutwhetherornottopasssignalsontothenextsegmentofanetwork.
Whenabridgereceivesaframeonthenetwork,thedestinationMACaddressislookedupinthebridgetabletodeterminewhethertofilter,flood,orcopytheframeontoanothersegmentBroadcastPacketsareforwardedRepeater,Hub,Bridge&SwitchSwitchSwitchesareMultiportBridges.
Switchesprovideauniquenetworksegmentoneachport,therebyseparatingcollisiondomains.
Today,networkdesignersarereplacinghubsintheirwiringclosetswithswitchestoincreasetheirnetworkperformanceandbandwidthwhileprotectingtheirexistingwiringinvestments.
Likebridges,switcheslearncertaininformationaboutthedatapacketsthatarereceivedfromvariouscomputersonthenetwork.
Switchesusethisinformationtobuildforwardingtablestodeterminethedestinationofdatabeingsentbyonecomputertoanothercomputeronthenetwork.
Repeater,Hub,Bridge&SwitchSwitches:DedicatedAccessHostshavedirectconnectiontoswitchFullDuplex:NocollisionsSwitching:A-to-A'andB-to-B'simultaneously,nocollisionsSwitchescanbecascadedtoexpandthenetworkRepeater,Hub,Bridge&SwitchswitchAA'BB'CC'
今天中午的时候看到群里网友在讨论新版本的Apache HTTP Server 2.4.51发布且建议更新升级,如果有服务器在使用较早版本的话可能需要升级安全,这次的版本中涉及到安全漏洞的问题。Apache HTTP 中2.4.50的修复补丁CVE-2021-41773 修复不完整,导致新的漏洞CVE-2021-42013。攻击者可以使用由类似别名的指令配置将URL映射到目录外的文件的遍历攻击。这里...
HostHatch在当地时间7月30日发布了一系列的促销套餐,涉及亚洲和欧美的多个地区机房,最低年付15美元起,一次买2年还能免费升级双倍资源。商家成立于2011年,提供基于KVM架构的VPS主机,数据中心包括中国香港、美国、英国、荷兰、印度、挪威、澳大利亚等国家的十几个地区机房。官方网站:https://hosthatch.com/NVMe VPS(香港/悉尼)1 CPU core (12.5%...
这不端午节和大家一样回家休息几天,也没有照顾网站的更新。今天又出去忙一天没有时间更新,这里简单搜集看看是不是有一些商家促销活动,因为我看到电商平台各种推送活动今天又开始一波,所以说现在的各种促销让人真的很累。比如在前面我们也有看到PacificRack 商家发布过年中活动,这不在端午节(昨天)又发布一款闪购活动,有些朋友姑且较多是端午节活动,刚才有看到活动还在的,如果有需要的朋友可以看看。第一、端...
802.11g为你推荐
Sicherheitsserverhostschromefollowcss支持ipad支持ipad买家googlenetbios端口如何组织netbios端口的外部通信tcpip上的netbios网络连接详细信息上的netbios over tcpip是什么意思?win7如何关闭445端口如何彻底永久取消win7粘滞键功能联通iphone4联通iphone4好用吗迅雷快鸟迅雷快鸟支持移动宽带提速吗
东莞虚拟主机 Oray域名注册服务商 lamp cve-2014-6271 博客主机 512m dropbox网盘 大容量存储 论坛空间 谁的qq空间最好看 河南m值兑换 北京双线 四核服务器 in域名 空间租赁 主机管理系统 国内域名 服务器论坛 atom处理器 国外免费云空间 更多