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NETW360 Week 4 iLab: Observing 802.11 FramesThe 802.11 media access control (MAC) layer performs several vital functions on a WLAN. These functions include discovering a WLAN, joining a WLAN, transmitting on a WLAN, and remaining connected to a WLAN. They are performed as the 802.11 frames are sent and received on a WLAN.One way of capturing these frames is to use Wireshark and AirPcap. Wireshark is a very popular network analyzer used by network professionals for troubleshooting, software/protocol development, and education. With the AirPcap wireless capture adapter plugged into the USB slot of a computer, one could then use Wireshark to capture and analyze 802.11 frames.In this lab, students analyze the following 802.11 frames from existing Wireshark capture files:Beacon framesProbe framesAuthentication framesAssociation frames Task 1: PreparationStudents are not required to capture 802.11 frames in this iLab. Four capture files are provided to students instead.From the Course Shell, download iLab4CaptureFiles.zip to a working directory of a computer. Right click on the .zip file, click Extract All to unzip its content into a directory with the same name. Go to http://lab.devry.edu, and launch the Wireshark program in the Citrix environment.Task 2: Beacon FramesIn the Wirehshark window, click File and Open to locate/open the first capture file: Capture1.pcapng. Click to select one of the beacon frames. Adjust sections of the Wireshark window so that you can see the frame details. Expand the IEEE 802.11 Beacon frame section by clicking on the + sign to its left.Record the basic information of the beacon frame below in the lab report document. Afterwards, shrink the header by clicking the – sign to its left.Type/Subtype of the frame: Source MAC address: Destination MAC address: Next, expand the radiotap header by clicking the + sign to its left. Record the radio information of the beacon frame below in the lab report document. Afterwards, shrink the header by clicking the – sign to its left.Data rate: Channel frequency: Channel type: Next expand the IEEE 802.11 wireless LAN management frame section. Expand both the fixed parameters and tagged parameters subsections. Provide the following information in the lab report document. Afterwards, shrink the header by clicking the – sign to its left.Beacon Interval: SSID: Supported Rates: What type of address, unicast, multicast, or broadcast is a beacon frame’s destination MAC address? Why?What’s the significance of increasing and decreasing the beacon interval, respectively, on a WLAN?In the Wirehshark window, click File and Close to close the first capture file.Task 3: Probe FramesIn the Wirehshark window, click File and Open to locate/open the second capture file: Capture2.pcapng.Locate the probe request frame that was broadcast from a wireless NIC. In the info column, it shows the SSID it was broadcast to.Expand the IEEE 802.11 probe request header by clicking the + sign to its left. Record the following information in the lab report. Afterwards, shrink the header by clicking the – sign to its left.Type/Subtype: Destination MAC address: Source MAC Address: Expand the IEEE 802.11 wireless LAN management frame header by clicking the + sign to its left. Record the following information in the lab report.SSID:Supported Rates: Extended Supported Rates: Look for the matching probe response frame and select/highlight it. This is sent from the access point to the wireless NIC that generated the previous probe request frame.Expand the IEEE 802.11 probe response header by clicking the + sign to its left. Record the following information in the lab report. Afterwards, shrink the header by clicking the – sign to its left.Type/Subtype:Destination MAC address: Source MAC Address: Expand the IEEE 802.11 wireless LAN management frame header by clicking the + sign to its left. Record the following information in the lab report.SSID:Supported Rates: Extended Supported Rates: Is the destination address of the probe response frame the same as the source address of the previous probe request frame?When a wireless client is looking for an access point or network, what frame(s) are involved in the passive scanning process? What frame(s) are involved in the active scanning process?In the Wirehshark window, click File and Close to close the second capture file.Task 4: Authentication and Association FramesIn the Wirehshark window, click File and Open to locate/open the third capture file: Capture3.pcapng.The first two frames are authentication frames. Highlight the first authentication (request) frame.Expand the IEEE 802.11 authentication and 802.11 wireless LAN management headers. Record the following information in the lab report. If needed, shrink the headers by clicking the – sign to their left.Type/Subtype: Authentication algorithm: Authentication SEQ: Status code: Highlight the second authentication (reply) frame.Expand the IEEE 802.11 authentication and 802.11 wireless LAN management headers. Record the following information in the lab report. If needed, shrink the headers by clicking the – sign to their left.Type/Subtype: Authentication algorithm: Authentication SEQ: Status code: Notice that the number of authentication frames exchanged during the process depends on the WLAN authentication method. With the open system authentication method, for instance, two authentication frames are exchanged between a wireless client and an access point.The next two frames are association frames. Highlight the association request frame.Expand the IEEE 802.11 association request and 802.11 wireless LAN management headers. Record the following information in the lab report. If needed, shrink the headers by clicking the – sign to their left.Type/Subtype: SSID: Highlight the association response frame.Expand the IEEE 802.11 association request and 802.11 wireless LAN management headers. Record the following information in the lab report. If needed, shrink the headers by clicking the – sign to their left.Type/Subtype: Status code: Association ID: Notice that the association process is successful; in other words, the association request is accepted by the access point. The access point then assigns an association ID and allocates memory space to the wireless client.In the Wirehshark window, click File and Close to close the third capture file.
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    Tutorial # 00081828 Posted By: mac123 Posted on: 08/01/2015 02:48 PM
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