wide area networks by patrick regan

Describe wireless wide area networks (WWANs) and how they are used

... 8-PSK–CDMA2000 1xRTT•Operates on two 1.25 MHz -wide frequency channels•Supports 144 Kbps packet data transmission2Objectives•Describe wireless wide area networks (WWANs) and how they are used•Describe ... networks –Watch television or on-demand movies–Take and transmit pictures and short movies–Locate family members and employees using GPS24Java•Java programming language–Developed by ... pager, satellite telephone, and location services41Summary•In cellular telephone networks, the coverage area is divided into sections called cells•Cellular technology generations–First...

Tài liệu Wide Area Networks doc

Danh mục: Quản trị mạng

... network edgePotentially discarded by Weighted Random Early Detection (WRED) (congestion mgmt)Assigned to the appropriate outgoing queueScheduled for transmission by CBWFQ and sent out interfaceClassify ... on.CAR can also be used to police precedence bits set externally to the network either by the customer or by a downstream service provider. Thus the network can decide to either accept or override ... the level of congestion Generic Traffic Shaping (GTS) shapes traffic by reducing outbound traffic flow to avoid congestion by constraining traffic to a particular bit rate using the token bucket...

Tài liệu Ethernet Access for Next Generation Metro and Wide Area Networks pptx

Danh mục: Quản trị mạng

... coordinate ToS byte (DSCP/IP Precedence) markings and bandwidth allocation.Ta b l e 2 QoS Configuration OptionsShaping by PortShaping by Logical InterfaceShaping by BranchShaping by VLANShaping ... and Wide Area Networks OL-14760-01 Design Considerations •Use of EIGRP stub areas eliminates queries to spoke routers. •OSPF must periodically synchronize router databases within an area, ... eachSee by class/VLANVLAN per branch with one shaper per classSee Scalability and Performance Results, page 4020Ethernet Access for Next Generation Metro and Wide Area Networks OL-14760-01...

Low Rate Wireless Personal Area Networks

Danh mục: Kỹ thuật lập trình

... shift to FIR speedWireless CommunicationsLow Rate Wireless Personal Area Networks 2Objectives•Describe a wireless personal area network (WPAN)•List the different WPAN standards and their ... networking technologies•Public key infrastructure (PKI)–Unique security code, or key, provided by a certificate authority•Certificate authority–Private company that verifies the authenticity ... is a wireless technology that uses short-range radio frequency (RF) transmissions–Supported by over 2,500 hardware and software vendors6Infrared WPANs (IrDA) (continued)15Bluetooth Link...

High Rate Wireless Personal Area Networks

Danh mục: Kĩ thuật Viễn thông

... a nanosecond long–Signal spreads over a very wide frequency band•In the UWB case, the signal spreads over a band that is at least 500 MHz wide –Orthogonal frequency division multiplexing ... Layer Functionality (continued)Wireless CommunicationsChapter 6High Rate Wireless Personal Area Networks Wireless# Guide to Wireless Communications 36Competition Among WPAN Standards•IEEE ... Communications 12802.15.3 Network Topology•Piconet coordinator (PNC)–Role assumed by the first device in the area –Provides all of the basic communications timing in a piconet–PNC sends a...

Wireless Local Area Networks

Danh mục: Kỹ thuật lập trình

... wireless clients and an AP•Extended Service Set (ESS)–Two or more BSS wireless networks installed in same area –Provides users with uninterrupted mobile access to the network•All wireless ... wireless clients can only communicate among themselvesWireless CommunicationsWireless Local Area Networks 4WLAN Components•Minimal hardware needed for a WLAN–Computer–ISP–Wireless network ... motherboard3WLAN Applications•Wireless networks are increasing in popularity•Installing cabling is inconvenient and very expensive–Wireless networks solve this problem•With a wireless...

Wireless Metropolitan Area Networks

Danh mục: Kĩ thuật Viễn thông

... easily incorporate WiMAX networks 3What is a WMAN?•Wireless metropolitan area networks (WMANs)–Provide wireless connectivity across a substantial geographical area such as a large city•WMANs ... to an entire area with only a few radio transmitters–MMDS cell size can have a radius of up to 35 miles (56 kilometers)2Objectives•Explain why wireless metropolitan area networks (WMANs) ... spatial variations in light intensity caused by atmospheric turbulence18IEEE 802.16 (WiMAX)•Standard for wireless broadband metropolitan area networks •802.16 supports enhancements and extensions...

Tổng quan về mạng WAN (Wide Area Netwwork) - Phần mềm Cool Chat

Danh mục: Kĩ thuật Viễn thông

... nam l mt yu t ht sc quan trng. Gii phỏp mng WAN ( Wide Area Network - Mng din rng ) c ỏp dng. Chỳng cú nhim v kt hp tt c cỏc mng LAN (Local Area Network ) xa li thnh mt mng duy nht cú ng truyn...

Personal Area Networks (PANs)

Danh mục: Kỹ thuật lập trình

... currentlyPersonal Area Networks (PANs) 309Figure 11.7 A scatternet formed by four piconetswireless headsets), the level of security decreases due to the fact that the chosen PIN, which iseither entered by ... collocated networks by checking the access code ﬁeld on thereceived packets which is different for every piconet, as we explain later. However, when alarge number of piconets coexist in the same area, ... collocated networks to transmit on the same hop at the same time is small.Still, if such a case occurs, a device can recognize and thus ignore packets originating fromcollocated networks by checking...

Wireless Local Area Networks

Danh mục: Kỹ thuật lập trình

... to provide security improve-ments.9.7 SummaryIn this chapter we cover the area of Wireless Local Area Networks by focusing on a numberof issues:†WLAN topologies. The two types of wireless ... be supported by both technologiesand is thus characterized by a moderate cost.However, the situation reverses when noise and interference are taken into account. FromWireless Networks2 50above ... DSSS signal has a rate of 11 Mbps. Multiple networks cancoexist in the same area provided they use subchannels with center frequencies separated by at least 30 MHz in order to avoid interference.Extending...

CCNA Layer 2 Switching - Virtual Local Area Networks Lab Scenario

Danh mục: Quản trị mạng

... /?Issue=34&IssueDate=04-01-2001&CP= 11/06/01Date of Issue: 04-01-2001 CCNA Layer 2 Switching - Virtual Local Area Networks Lab Scenario by Leigh Anne Chisholm IntroductionPreparing Your SwitchesSection 1 - Configuring ... exec mode by issuing the commandenableA "# "prompt will be displayed.3. To begin configuring the switch name, IP information, and password; enter global configuration mode by issuing ... between switches.Begin this part of the lab by configuring SwitchB.1. On SwitchB, enter global configuration mode from the privileged exec mode prompt by issuing the commandconfigure terminalThe...

Tài liệu cisco migration_Enterprise Branch Wide Area Application docx

Danh mục: Chứng chỉ quốc tế

... be found in the Unified 7Enterprise Branch Wide Area Application Services Design Guide (Version 1.1)OL-12945-01 IntroductionFigure 1 Wide Area Application Services (WAAS) MechanismsThe ... tuned so that its MSS is best suited for the type of WAN link at the branch. Wide area file services are also affected by the BDP and need to be tuned for its established sockets to be used most ... WAEs. Multiple edge WAEs can be configured in a cluster. By default, load balancing is done by round-robin, although it can be done by source and destination IP address. As an observation,...

Tài liệu Enterprise Data Center Wide Area Application Services (WAAS) Design Guide pptx

Danh mục: Quản trị mạng

... 95134-1706 USAEnterprise Data Center Wide Area Application Services (WAAS) Design GuideThis document offers guidelines and best practices for implementing Wide Area Application Services (WAAS) ... Promotion of the standby Central Manager to the primary Central Manager is configured from the CLI of the standby Central Manager by changing the Central Manager role from standby to primary. When ... default gateway pingable, which is accomplished by configuring the WAE VLAN interface as a management interface: 24Enterprise Data Center Wide Area Application Services (WAAS) Design GuideOL-12934-01...

Tài liệu 100 Linux Tips and Tricks by Patrick Lambert ppt

Danh mục: Hệ điều hành

... };key <MENU> { [ braceright ] }; By browsing the file you can find all the other symbols and what they do. You can also add multiplefunctions to a key, by using ALT and SHIFT.The changes ... automatically by the kernel. One case where they would not bedetected is if the device is Plug and Play. The kernel won't be able to detect ISA PnP devices unless theyhave been prepared by a program ... the lilo.conf file and enable changes.100 Linux Tips and Tricks33100 Linux Tips and Tricks by Patrick LambertTip 4: Installing with no CD-ROM drive or modemMost Linux distributions come...

Tài liệu Chapter11 Wide Area Networking Protocols pptx

Danh mục: Chứng chỉ quốc tế

... s0/0 Chapter11 Wide Area Networking Protocols Introduction to Wide Area Networks WAN 是覆盖地理范围相对较为广阔的数据通信网络,它一般是利用公共载体(比如电信公司)提供的设备进行传输.WAN 技术运行在 OSI 的最下 3 层广域网 (Wide Area Network,WAN)的一些术语 ... Mode,ATM):国际电信联盟电信标准委员会(ITU-T)制定的信元(cell)中继续标准.ATM 使用固定长度的 53 字节长的信元方式进行传输,ATM 网络的面向连接的 Cabling the Wide Area Network Cisco 的串行连接支持几乎所有类型的 WAN 服务.HDLC,PPP 和帧中继使用相同的物理层定义的接口,但是和 ISDN 的不一样.我们先来回顾下 ... disconnect int bri0:断开连接.和在接口使用 shutdown 命令效果是一样的 Postscript Noko#sh run ! Written by 红头发 a.k.a. Noco Description 欢迎转 po,请保留作者信息 Mar.26th.2004 ! Special thanks Noko & all...