PowerPoint
5.1 #
#:
#Web
CNNIC#5.2 #
#
PANPersonal Area Network, LANLocal Area Network, MANMetropolitan Area Network, WANWide Area Network, #PANPersonal Area Network,
10
WLAN#LANLocal Area Network,
10Mbps~10Gbpsn10-12~10-7#WANWide Area Network,
Internet#RTT
#data ratebit rateb/sbpsbit per secondS=1/TT
#bandwidth
#Rmax=2fB=f=5 000Hz10 000bpsNyquistShannonRmaxBS/NRMAX=Blog2(1+S/N)RmaxbpsBHz#Pe=Ne/NNNe#throughput1000Mb/s1000Mb/s600Mb/s#delay latency
#
transmission delay
#
propagation delay
#
#
=+++
#=
#RTT
RTTRound-Trip TimeRTT
#
###ISO/OSIISOISOISO/IEC 7498X.2007OSIInterconnectionInteroperationPortability#ISO/OSIISO7ISO#ISO/OSI
#TCP/IPTCP/IPARPANETARPANETDoD(U.S.Department of Defense)TCP/IPTCP/IP reference model
#TCP/IPTCP/IPTCP/IP#TCP/IPTCP/IPOSI
#TCP/IP
Host-to-Net LayerOSIHDLCPPPSLIPInter-network LayerOSIIPICMPARPRARPTransport LayerOSITCPUDPApplication LayerOSIFTPHTTPDNSSMTPNFS#OSITCP/IP
OSITCP/IP# TCP/IPOSI
#OSITCP/IP1 2 OSITCP/IP1 2 3 OSI, TCP/IP, TCP/IP4 OSITCP/IP#5.3 ##4
#
# 5568B568A#
#
#
#TCP/IPInternetIPIPInternet TCP/IPInternet TCP/IP#
Internet TCP/IP
#
Windows 7#PingIPPing Ping192.168.194.35192.168.194.4192.168.194.35DOSping 192.168.194.4#TCP/IP Pinging 192.168.194.4 with 32 bytes of data: Reply from 192.168.194.4 : bytes =32 time
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