securing a wireless network

... with a general understanding of the substantial evolution that has taken place in this area.The common wireless networks of today originated from many evolutionary stages of wireless communications ... multiple PCs within a physical area to form what is known as a local area network (LAN) A LAN connects network devices over a short distance Common applications include offices, schools, and the home ... Horizontal Applications Along with the many vertical markets and applications, you can apply wireless technologies to horizontal applications, meaning that delivery services, public safety, finance,...

Ngày tải lên: 14/08/2014, 18:22

... application.The wpa_supplicant is installed as a daemon that runs as a background process It has a command-line interface as well as a graphical user interface As of this writing, the latest stable release ... such as address as part of the SSID At this point, it would also be a good idea to change the Name of the Airport under the Base Station heading, to obfuscate the fact that this is an Apple Airport ... your local host Open a command prompt and change to the directory that contains the installation package Untar the package by issuing the command tar xvfz wpa_supplicant-0.4.9.tar.gz Change your...

Ngày tải lên: 14/08/2014, 18:22

... organization’s network as far as the wireless signal can travel An intruder who takes advantage of this fact can be one of your neighbors in the office park, an employee at another organization ... box, which looked like any standard gray utility box, contained a single board PC, a wireless network card, a gigabyte hard drive, a high-gain patch antenna, and a battery large enough to run the ... colleague of mine was given the task of breaking into a wireless network at a rather sensitive and secure facility as part of an authorized penetration test activity Because the organization had...

Ngày tải lên: 14/08/2014, 18:22

... per-VLAN basis (PVST) PVST can block or forward based on the specific VLAN It treats each VLAN separately By treating each VLAN on a perVLAN basis, the administrator can load-balance traffic by forwarding ... detect wireless radio signals and access points within a reachable signal area that can then be compared against a list of known authorized access points If the new MAC address of an access point ... user workstation There are many network scanners that can be used to scan large user LANs One of the more popular scanners is called NMAP NMAP is a free network scanner available at www.nmap.org...

Ngày tải lên: 14/08/2014, 18:22

... the advantages of separating LANs with VLANs includes the creation of separate broadcast domains A broadcast domain assures performance and scalability and prevents users from different logical ... separate access points within a wireless LAN must be supported on separate and distinct channels within that wireless topology Similarly, adjacent channel spacing and active channel separation ... traffic and benefits of broadcast domain segmentation in wired networks, we will take a closer look at broadcast segmentation in wireless networks In a wired network, VLANs are used to separate...

Ngày tải lên: 14/08/2014, 18:22

... is not allowed access to the WLAN Authentication can also be made against a list of MACs allowed to use the network. This list of allowable MAC addresses may be on the AP or on a database somewhere ... Coverage Area A Channel (Frequency Range) #1 ST -a1 Channel (Frequency Range) #5 ST -a2 ST-b1 AP -a1 ST -a4 Coverage Area B ST-b2 AP-b1 ST -a3 ST-b4 ST-b3 AP = Access Point ST = Station Wireline Network ... the base standard for LAN/MAN Bridging, LAN architecture, LAN management, and protocol layers above the MAC and LLC layers Some examples would include 802.1q, the standard for virtual LANs, and...

Ngày tải lên: 14/08/2014, 18:22

... signal strength and denial of service (DoS) attacks can all dramatically affect your availability In the past, for an attacker to perform a denial of service attack against your internal network, ... points externally where the signal was available Special attention should have been paid to problematic areas, such as cafes, roadways or parking lots These areas are problematic because it is ... installations offer instant access into this network, it can be much easier for an attacker to get in and start shutting things down.There are two main ways an attacker can conduct a DoS against...

Ngày tải lên: 14/08/2014, 18:22

... Designing a Wireless Industrial Network: Retail Case Study ■ Plan the access point locations to take advantage of transmission coverage Make sure one or two radios are added to the access point as needed ... used are DES, 64- bit WEP, and 128bit RC4 Also, MAC address-based access control table schemes are used Q: What are the ranges of wireless devices outdoors? A: Directional antennas can provide a ... a diamond, the radios as ovals, and a small antenna tower as an extended radio antenna.The RF patterns for the secondfloor overlap, as shown in Figure 10.6.This overlap provides double coverage...

Ngày tải lên: 14/08/2014, 18:22

... not always better.The signal pattern of an omni-directional antenna resembles a donut An antenna with a lower gain has a smaller circumference, but is taller An antenna with a higher gain has a ... number of unique IVs Attacks Against WPA Unlike attacks against WEP, attacks against WPA not require a large amount of packets to be collected In fact, most of the attack can actually be performed ... for attacking WEP encrypted networks, and why are some more effective than others? Is the dictionary attack against LEAP the same as the dictionary attack against WPAPSK? Once a pen tester has an...

Ngày tải lên: 14/08/2014, 18:22

... command with no parameters An association was not made It would appear that our target has taken a step to restrict access We make an educated guess that they are using MAC address filtering to accomplish ... reboots Broadcast Domain Segmentation A broadcast domain segmentation prevents broadcast-directed traffic from one VLAN reaching other VLANs that are considered to be in a separate broadcast domain Unlike ... InfoDrive network Now we are ready to start our attack against the WLAN First, we fire up Aireplay and configure it to capture an ARP packet that we can inject into the network and generate the traffic...

Ngày tải lên: 14/08/2014, 18:22

... the data An example of this is when an animal is tagged with a transmitter and the signal is collected and data is gathered over a period of time to be interpreted at a later date Monitoring applications ... Services Creating a Detailed Physical Design Creating a Detailed Operations Design Creating a Detailed Operating Model Design Creating a Training Plan Developing a Maintenance Plan Developing an Implementation ... central gateway to reach the Internet A wireless local area network transmits over the air by means of base stations, or access points, that transmit a radio frequency; the base stations are connected...

Ngày tải lên: 16/10/2013, 13:15

... Wheeler,Victoria Fuller, Jonathan Bunkell, and Klaus Beran of Harcourt International for making certain that our vision remains worldwide in scope Anneke Baeten, Annabel Dent, and Laurie Giles of Harcourt Australia ... Services Creating a Detailed Physical Design Creating a Detailed Operations Design Creating a Detailed Operating Model Design Creating a Training Plan Developing a Maintenance Plan Developing an Implementation ... central gateway to reach the Internet A wireless local area network transmits over the air by means of base stations, or access points, that transmit a radio frequency; the base stations are connected...

Ngày tải lên: 14/08/2014, 14:20

... referred to as a beam Directional antennas fall into two general categories: parabolic and phased array Parabolic antennas function similar to a flashlight in that they use a dish-shaped reflector ... signal is carried away from the antenna by a cable Now let’s consider a piece of metal that does not have a conductive path to ground and is acting as an antenna.The magnetic and electrical waves ... design and construction of a Yagi antenna Figure 2.16 Yagi Phased Array Antenna and Associated Directional Beam Pattern Yagi Phased Array Antenna Cable Direction of Beam Reflector Element Driven...

Ngày tải lên: 14/08/2014, 14:20

... than directional antennas because they distribute their power over a wider area Parabolic antennas usually have the highest gain of any type of antenna A half-wave dipole antenna will have a gain ... antenna All other things being equal, a high-gain antenna will transmit and receive weaker signals farther than a low-gain antenna Omnidirectional antennas, such as dipole, will have lower gain ... to another? A: Antenna gain is the measure of the amount of signal the antenna radiates or receives It is given as a decibel ratio, compared to a theoretical omnidirectional antenna called an...

Ngày tải lên: 14/08/2014, 14:20

... with static addressing DHCP maintains a database of all addresses and to what device they are assigned, as well as which addresses are available Let’s talk about the process of address assignment.When ... organization responsible for maintaining IP addresses, you can get the details necessary to obtain a range In North America, South America, the Caribbean, and sub-Saharan Africa, the organization ... Internet).Typically, networks that have private addressing schemes, usually referred to as internal networks, are designed that way because a majority of the traffic on that network is local traffic, meaning...

Ngày tải lên: 14/08/2014, 14:20

... be made against a list of MACs allowed to use the network. This list of allowable MAC addresses may be on the AP or on a database somewhere on the wired network A wireless device can authenticate ... the same information in a couple of large packets.Thankfully, the 802.11 standard has made this a configurable feature.This way, a network administrator can specify short packets in some areas and ... air photonics, or infrared broadband Optical wireless data rates and maximum distance capabilities are affected by visibility conditions, and by weather conditions such as fog and rain Optical...

Ngày tải lên: 14/08/2014, 14:20

... separate and distinct channels within that wireless topology Similarly, adjacent channel spacing and active channel separation play an important role when planning and deploying a wireless network. These ... suggest contacting Parks Associates at www.parksassociates.com.The Continental Automated Buildings Association (CABA) at www.caba.org is another good source for learning about home network technologies ... examining the attributes of a wireless network Both mobility and ease of access are touted as some of the greatest characteristics available when using a wireless LAN Unfortunately, these same attributes...

Ngày tải lên: 14/08/2014, 14:20

... 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 is the shoe department, ... access point as a diamond, the radios as ovals, and a small antenna tower as an extended radio antenna.The RF patterns for the secondfloor overlap, as shown in Figure 7.6.This overlap provides ... hospital .Wireless local area network (LAN) devices in this scenario were to help information services (IS) managers provide additional functionality and services By installing wireless LAN access...

Ngày tải lên: 14/08/2014, 14:20

... Q: What are my choices in alternative handheld devices for a retail application? A: There are many handheld devices on the market Any industrial handheld device that is capable of scanning and ... From a maintenance standpoint, a wireless network enables you to create a more dynamic and cost efficient architecture to support the rapid changes and flexible management demanded of a campus .Wireless ... campus At this time, only three academic areas are addressed.The planned network must be easy to adapt as these areas of study increase or change For example, the Math and Computer Sciences department...

Ngày tải lên: 14/08/2014, 14:20

... What is an access point (AP) and what is its main function? A: An access point is a wireless bridge that provides access to a wireless station so that it can communicate with a wired LAN An access ... of raw data passed through a link 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 ... plans, designs, and implements a wireless home network As a part of these processes, Jan learns more about the strengths and weaknesses of wireless networks, and about the costs and advantages...

Ngày tải lên: 14/08/2014, 14:20