benefits of using a wireless network

Security and Privacy Vulnerabilities of In-Car Wireless Networks: A Tire Pressure Monitoring System Case Study ppt

... facilitates tracking and battery drain at-tacks. Although activation signals are very simple, theycan convey a minimal amount of bits. Thus, using a longpacket format with encryption and authentication ... to get a match rate of more than P = 1%.We note that this calculation is based on the unrealis-tic assumption that all 38 billion cars are co-located, andare using the same modulation and coding ... determine how many cars R can be onthe road in the US with a guarantee that there is a lessthan P chance of any two or more cars having the sameID-set, is a classical birthday problem calculation:R...

báo cáo hóa học: " TCP NCE: A unified solution for non-congestion events to improve the performance of TCP over wireless networks" docx

Danh mục: Hóa học - Dầu khí

... retransmissions and thereby increase the perfor-mance of TCP over wireless networks.List of AbbreviationsACL: accuracy of congestion loss; ARL: accuracy of random loss; APR:accuracy of packet ... timestamp based available bandwidth esti-mation (TABE) and congestion warning scheme. Toestimate the available bandwidth, TCP Jersey follows thesame idea of TCP Westwood’s rate estimator to ... especially in the case of packet reordering rather than using an algorithm thatsamples one RTT p er window of data. The reason is,in the presence of spurious fast retransmits, TCP islikely to have...

Designing A Wireless Network

Danh mục: Quản trị mạng

... Service as a Network Systems Engineer bringinghis knowledge of the desktop platform and a general understanding of a broad range of technologies in areas such as remote access, ATM,frame relay, and ... centrallocation so that someone awaiting a delivery can log into the Web siteand get accurate information regarding the status of a package. Using Wireless for Public SafetyPublic safety applications got ... 25Modulating a Radio Signal 27Propagating a Strong Radio Signal 34Understanding Signal Power andSignal-to-Noise Ratio 35Attenuation 36Rain Attenuation 39Bouncing 39Refracting 41Line of Sight...

ON APPLICATION-PERCEIVED QUALITY OF SERVICE IN WIRELESS NETWORKS

Danh mục: Quản lý dự án

Tài liệu AUDIT OF THE DEPARTMENT OF JUSTICE’S IMPLEMENTATION OF THE INTEGRATED WIRELESS NETWORK ppt

Danh mục: Kế toán - Kiểm toán

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the handbook of ad hoc wireless networks

Danh mục: Đại cương

... generation table in the paper) associated with each station. Basically, each station is assigned a special label, and it is selected as a forwarding node if its label is a preﬁx of the label of ... P (Parking state) are stations that are synchronized with the master but are not participating in any data exchange.Independent piconets that have overlapping coverage areas may form a scatternet. ... that either a shared multicast tree be used for all sources or that a separate multicast tree be established for each source. Using a shared multicast tree has the disadvantage that packets are...

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designing a wireless network phần 1 pot

Danh mục: Quản trị mạng

... Waves 24Anatomy of a Waveform 25Modulating a Radio Signal 27Propagating a Strong Radio Signal 34Understanding Signal Power andSignal-to-Noise Ratio 35Attenuation 36Rain Attenuation 39Bouncing ... generator. Faraday’s initial ﬁndings still serve as thebasis of modern electromagnetic technology.Around the same time that Faraday worked with electromagnetism,an American professor named ... of the desktop platform and a general understanding of a broad range of technologies in areas such as remote access, ATM,frame relay, and wireless. In addition, his background includes con-sulting...

designing a wireless network phần 2 pptx

Danh mục: Quản trị mạng

... thesignal cannot penetrate metal. Assume you have a metal sphere. As anEM wave hits the leading edge of the sphere, it acts like an antenna, andthe wave induces a voltage in the metal.This voltage ... but remember, a wireless network typically is not a stand-alone network. For example, a wireless local area network (LAN) iscomposed of access points, antennas, and wireless PC cards.The onlyconnection ... metal among the materials.Metal is a special case for penetration of EM waves. Let’s ﬁrst considerhow an antenna works. At the transmitting end, a cable is hooked to anantenna.The signal travels...

designing a wireless network phần 3 ppt

Danh mục: Quản trị mạng

... mounted ﬂat on a wall, yet still have the proper-ties and gain of a directional antenna. Figure 2.17 shows a planar arrayantenna.www.syngress.comFigure 2.17 Planar Array Antenna and Associated ... antennas.Planar Array AntennasPlanar array antennas are similar in concept to Yagi antennas except allelements, both active and parasitic, lie in the same plane.This results in a ﬂat antenna that can be mounted ... Directional Beam PatternSide ViewPlanar Phased Array AntennaDirection of BeamAntennaGDirectional BeamMultiple Antenna Elements Shown with Dipole AntennasTop ViewSteerable BeamPlanar Array...

designing a wireless network phần 4 pptx

Danh mục: Quản trị mạng

... necessary to obtain a range. InNorth America, South America, the Caribbean, and sub-SaharanAfrica, the organization responsible is the Address Registry forInternet Numbers (ARIN), which can be ... the organization isthe Asia/Paciﬁc Network Information Centre (APNIC), which canbe found at www.apnic.net.Q: When using PAT, how can I accommodate all the necessary ports? A: Approximately ... A dynamically routed network is capable of facilitating these types of changes.How is an algorithm aware that the network has changed?Remember that an algorithm is just one component of a routing pro-tocol.There...

designing a wireless network phần 5 pot

Danh mục: Quản trị mạng

... checkedagainst a database of allowed MACs located on the wired network. Thistypically provides a good level of security, and is best used with smallWLAN networks.With larger WLAN networks, administering ... supporting hardware and software that youhave called for in your network design.Although this may be an exhila-rating time, where concept enters the realm of reality, it is vital that youmanage this ... devicewants to access the Internet, it ﬁrst needs to access a WAP gateway.Thisgateway, which is actually a piece of software and not a physical device,optimizes the content for wireless applications....

designing a wireless network phần 6 potx

Danh mục: Quản trị mạng

... often theirgreatest weaknesses.The same can be said when examining the attributes of a wireless network. Both mobility and ease of access are touted assome of the greatest characteristics available ... landscape perspective, we can easily see how physicalobstructions may affect signal quality and overall throughput.As such,placement of antennas, angles of reception, antenna gain and distance ... distinct channels within that wireless topology. Similarly, adja-cent channel spacing and active channel separation play an importantrole when planning and deploying a wireless network. These aspectsrefer...

designing a wireless network phần 7 ppt

Danh mục: Quản trị mạng

... BuildingsElevatorsMechanicalRoomCommunicationsRoomConferenceRoomOffice Office Office OfficeOfficeOfficeOfficeOfficeOfficeOfficeOfficeOffice OfficeOfficeOfficeBreakRoomAPAP152_wan_06 6/21/01 3:24 PM Page 219 Designing a Wireless Enterprise ... clothing departments, a shoe department, a baseball/soccer department, a golf department, a sea-sonal department, and a sunglasses department. Generally, the most active of all the ﬁrst-ﬂoor departments ... the network development phases of planning and design.Obtaining a Physical MapThe physical map contains information about the placement of the dif-ferent areas of the store, information about...

designing a wireless network phần 8 ppsx

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... athletic, and academic areas of the campus. At this time, only three academic areas are addressed.Theplanned network must be easy to adapt as these areas of study increase orchange. For example, ... Athletic department mayhave functional groups of coaches, players, and the press.TheAdministrative department may designate a Financial functional group, aswell as Student Records and Management ... as encryptionand password allocation to ensure the concept of fair play and remainwithin NCAA rules and guidelines. Both teams must have equal capabil-ities to meet NCAA rules.Visiting coaching...

designing a wireless network phần 9 potx

Danh mục: Quản trị mạng

... of raw data passed through a link or network and includes both overhead signaling data as well as userdata.Throughput refers to the actual amount of user data passedthrough the link or network. Q: ... Page 296 300 Chapter 8 ã Designing a Wireless Campus Network: University Case Study A: Signal power and antenna type are the two primary factors in therange of the signal. Noise levels can also ... signal with up to 8 high-quality 2.4 GHz voicechannels and all the Custom Local Area Signaling Service (CLASS)calling features like call waiting and caller ID.The HomeRF standardalso uses a...