using a secure wireless network

... of Table1shows the ranges of these parameters In addition, as the translation and Euler angle of each particle image can be generated by mainstream software, such as RELION and EMAN, we can apply ... images Because many researchers have uploaded their results and initial or intermediate data to EMData-Bank [15] and EMPIAR [16], we developed an automated method to generate segmentation-training ... performed a parallel local-maximum searching method to calculate the Table 1 Data used in the training datasets Electron Dose (e/Å**2) Trang 6particle coordinates Each thread covers one candidate.As

Ngày tải lên: 25/11/2020, 13:18

... Universitaria Reformada CUR, Barranquilla, Colombia Hugo.hp83@yahoo.com Faculty of Economic Sciences, Corporación Universitaria Latinoamericana CUL, Barranquilla, Colombia cvargas@ul.edu.co Department ... Colombia nataly.orellano@gmail.com Department of Accreditation, Universidad Libre, Barranquilla, Colombia evasquez@unilibrebaq.edu.co Abstract The campus wireless networks have many users, who have ... each site is EIGRP, and between sites is BGP The headquarters of Soledad Headquarters and Barranquilla have each a wireless controller and some autonomous WAPs Several tests of the wireless network

Ngày tải lên: 28/10/2022, 02:23

... authorization using TACACS+ Trang 15As a candidate for CCNA examination, when you are familiar with the basic commands, if you input the command “enable secret level 5 password” in the global mode, ... practices can help mitigate worm and other automated attacks? Set connection limits Which feature is a potential security weakness of a traditional stateful firewall? It cannot detect application-layer ... Question 10 Which statement is not a reason for an organization to incorporate a SAN in its enterprise infrastructure? To decrease the threat of viruses and worm attacks against data storage devices

Ngày tải lên: 29/10/2013, 00:50

... Computer simulations are used to evaluate the performance of different methods and to study the advantages and disadvantages of POCS as well as OA. The rest of this paper is organized as follows. ... Formally, POCS for a tar- get i can be implemented as Algorithm 2, where  λ i k  k≥0 are relaxation parameters, which are confined Gholami et al. EURASIP Journal on Wireless Communications and ... Tian, GB Giannakis, H Kobayashi, AF Molisch, HV Poor, Z Sahinoglu, Sahinoglu, Localization via ultra-wideband radios: a look at positioning aspects for future sensor networks IEEE Signal

Ngày tải lên: 20/06/2014, 22:20

... need extra hardware such as directional antennae, and cannot obtain satisfied localization performance in that some attacked locators may still be undetected Reference [13] requires a large amount ... the abnormality and inform the sensor We define the event that at least one locator lies inD1asA and the event that each of the regionsDR(A2)\ D1andDR(A1)\ D1inFigure 3has at least one locator asB ... set inappropriately a small value To overcome the above problem, we propose an enhanced valid locators identification approach which can adaptively adjust the thresholdτ2to make the sensor easier

Ngày tải lên: 21/06/2014, 23:20

... the signal decay exponent and takes values between 2 and 3 α is an adjustable con-stant, and a largerα implies faster signal power decay Note that the signal attenuation model can be easily extended ... approach can be adapted to complicated and practical applications Suppose that the sensor field is quite vast and the sig-nal decays very fast as the distance from the target increases As a result, ... without any loss of gen-erality As a result, at a particular time, only a small subset of sensors can detect the target To save communication and energy, a local sensor only transmits data (“1”s)

Ngày tải lên: 23/06/2014, 00:20

... 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 wireless ... Applications Along with the many vertical markets and applications, you can apply wireless technologies to horizontal applications, meaning that delivery services, public safety, finance, retail, and ... Waveform 25Modulating a Radio Signal 27Propagating a Strong Radio Signal 34Understanding Signal Power and Signal-to-Noise Ratio 35Attenuation 36 Bouncing 39Refracting 41 Penetration 43Understanding

Ngày tải lên: 14/08/2014, 14:20

... anythingfrom analog audio to a computer-generated digital square wave.The car-rier wave is called the modulated wave because it is the wave that isbeing changed by the modulating or signal wave Almost all ... information that we as humans want to transmit areanalog signals Human speech, music, video, and pictures are all analog bynature However, because computers use binary to store and processinformation, ... to as a bit stream and graphi-cally are represented as a square wave (see Figure 2.4) In its simplestform, digital modulation is easier to conceptualize and easier to performthan analog modulation.That

Ngày tải lên: 14/08/2014, 14:20

... Planar Array Antennas Planar array antennas are similar in concept to Yagi antennas except all elements, both active and parasitic, lie in the same plane.This results in a flat antenna that can be mounted ... mounted flat on a wall, yet still have the proper- ties and gain of a directional antenna. Figure 2.17 shows a planar array antenna. www.syngress.com Figure 2.17 Planar Array Antenna and Associated ... Directional Beam Pattern Side View Planar Phased Array Antenna Direction of Beam Antenna G Directional Beam Multiple Antenna Elements Shown with Dipole Antennas Top View Steerable Beam Planar Array

Ngày tải lên: 14/08/2014, 14:20

... with static addressing.DHCP maintains a database of all addresses and to what device they areassigned, as well as which addresses are available.Let’s talk about the process of address assignment.When ... impor-tant Imagine that you are the owner of a large telecommunications Trang 2lim-company.You support voice and data, which means that you might havea Frame Relay network, an ATM network, an IP network, ... an external address pool Addressmapping is illustrated in Figure 3.10 A unique address range is assignedto a particular network making up the address pool As the name cates, the process of mapping

Ngày tải lên: 14/08/2014, 14:20

... device is not allowed access tothe WLAN Authentication can also be made against a list of MACsallowed to use the network.This list of allowable MAC addresses may be on the AP or on a database somewhere ... receive an ACK, it will know that this packet was not received andwill transmit it again All this takes place at the MAC layer Noticing that an ACK has notbeen received, the sending unit is able ... greater than the cost of sending the same information in a couple of large packets.Thankfully,the 802.11 standard has made this a configurable feature.This way, a net-work administrator can specify

Ngày tải lên: 14/08/2014, 14:20

... access are touted as some of the greatest characteristics available when using a. .. architecture phase was completed thoroughly and with accurate information) Basically, the detail design is a ... www.parksassociates.com.The Continental Automated Buildings Association (CABA) at www.caba.org is another good source for learning about home network technologies from a broad and unbiased perspective ... that will enable the busi- ness goals to be accomplished.There can be several different technology plans—a primary plan and any number of alternatives.The alternative plans can be in anticipation

Ngày tải lên: 14/08/2014, 14:20

... departments, a shoe department, a baseball/soccer department, a golf department, a seasonal department, and a sunglasses department Generally, the most active of all the first-floor departments ... with additional information For example, if there was no access to an electrical... mechanical, elevator, and communications rooms In addition, having two access points increases the range and ... schemes are used Q: What are the ranges of wireless devices outdoors? A: Directional antennas can provide a range of up to 16 miles Q: What routing or bridging functionality is available on access

Ngày tải lên: 14/08/2014, 14:20

... academic areas ofthe 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, the Math and Computer ... softwaredevelopment Trang 14Q:What are my choices in alternative handheld devices for a retailapplication?A:There are many handheld devices on the market Any industrial held device that is capable ... availability of the unit Trang 8Install the AP Manager SoftwareAfter the access points are installed, install the AP Manager software on aWindows NT server in the server closet.This server has

Ngày tải lên: 14/08/2014, 14:20

... is a wireless bridge that provides access to a wireless station so that it can communicate with a wired LAN. An access point can also be a bridge used to communicate with other wireless stations. ... Designing a Wireless Campus Network: University Case Study A: Signal power and antenna type are the two primary factors in the range of the signal. Noise levels can also affect it since longer distances ... or network and includes both overhead signaling data as well as user data.Throughput refers to the actual amount of user data passed through the link or network. Q: What determines the coverage

Ngày tải lên: 14/08/2014, 14:20

... capabilities.The raw data rate available is up to a 3.75kilometer distance with 10 Mbps ; There are no interference or licensing issues with optical wireless,and its data rate and distance capabilities are ... investigation, analysis, and design beforepurchasing any wireless networking solutions ; The advantages of wireless are that it offers you mobility and isavailable in locations where a wired ... digital transmission of voice and limited band-width data; 3G refers to digital transmission of multimedia at broad-band speeds (voice, video, and data) ; The Wireless Application Protocol (WAP)

Ngày tải lên: 14/08/2014, 14:20

... technology Around the same time that Faraday worked with electromagnetism, an American professor named Joseph Henry became the first person to transmit a practical electrical signal As a watchmaker, ... experiments, and the world prepared for a new era in radio, the wireless transmission of electromagnetic waves An Italian inventor called Guglielmo Marconi was particularly... Michael Faraday, an English ... Attacks Against WPA 3 91 Attacks Against LEAP 3 91 Attacks Against VPN ... pass electric current through a cable that was underwater.The ultimate result of the demonstration was wireless

Ngày tải lên: 14/08/2014, 18:22

... to as WPA2 WPA2 uses AES asthe encryption standard, whereas WPA uses the TKIP standard.This is not to say thatWPA is not secure but to acknowledge that wireless security is ever changing.WPA2 also ... Broadcast Setting a Password on the Airport Because the Airport is in a default configuration, it is wise to set a password on theAirport to disable the ability of anyone making unauthorized changes ... a personal authentication implementation (PSK) and an enter-prise authentication implementation (RADIUS).This chapter focuses on the WPAstandard Log in to the WRT54G and click the Wireless tab

Ngày tải lên: 14/08/2014, 18:22

... through intermediate CAs, according to a certification path. The root CA can be a public or commercially available CA that issues an autho- rization to a subordinate CA, or it can be one deployed ... ■ EAP MD-5 CHAP This allows for authentication based on a user- name/password combination. A number of disadvantages are associated with using EAP MD-5 CHAP. First, even though it uses one-way ... I have heard that WPA is vulnerable to dictionary attacks What does this mean? A: A dictionary attack tries to guess the preshared key, password, or passphrase in use by testing it against

Ngày tải lên: 14/08/2014, 18:22

... popular scanners is called NMAP NMAP is a free network scanneravailable at www.nmap.org website Detecting a Rogue Access Point with a Port Scanner Figure 4.15 shows a typical user LAN with a large ... mutual authentication in EAP is Light Extensible Authentication Protocol (LEAP) and EAP-Transport Layer Security (EAP-TLS) In LEAP, authentication and challenges are derived from usernames and passwords ... thatyou have implemented a very stable and secure wireless and wired network.Yoursecure wireless local area network (LAN) includes per-user authentication using an802.1x protocol, a dynamic Wired

Ngày tải lên: 14/08/2014, 18:22