sybex ccna 640-802 pdf

sybex ccna 640-802 pdf.The 802.11a/nRadios and 802.11b/g/nRadios options are discussed further and more information can be found on the Monitoring Summary page by selecting the Details link for a particular radio. We can see where the radio is located (slot) and the MAC address of the base radio. Looking closely at Figure 13-19, you can see that with Operational Statuso enabled you can also get information related to the load profile, noise profile, interference profile, and coverage profile.The Load profile is set to 80% by default. If the load on a particular AP exceeds the threshold, the load profile displays a warning instead of a "passed" status. Likewise, if the SNR is too low, the Loadprofile displays a warning. If there is too much interference on the channel where the AP is located, the Interference profile displays a warning. A warning is displayed in the Interference Profile if there is too much interference on the channel where the AP is located. If the client roams out and cannot switch to another AP, the Coverage profile displays a warning. To view the details of these profiles, select the Details link on the right side of the page shown in Figure 13.18, which will then display the page shown in Figure 13.20.This will eventually take you to the Radio Statistics page. Some of the line items ( item) that appear here are important, but are not visible in the diagram.Note: In order to see what is listed in the previous bulleted list, it is necessary to navigate all the way down in the controller's web interface, as the resulting page is too long. Therefore, it is not fully displayed in Figures 13 to 20.Noise, Channel Comparison Graph: shows the magnitude of non-802.11 noise interference on each channel of the AP and on each channel. InterferencebyChannel: Shows the statistics of other 802.11 interference.LoadStatistics: Provides information about transmission and reception utilization, channel utilization, and connected clients.Two graphs exist: % Client Count vs. RSSI (% Client Countvs. RSSI); % Client Count vs. SNR (% ClientCountvs. SNR).The next section presents Rx neighbor information. This section shows the neighbor APs and their IP addresses and Received Signal Strength Indication (RRSI). The controller uses this information to assign channels and ensure adequate coverage by shaping the coverage area.200 Chapter 13 Simple Network Configuration and Monitoring with Cisco Control VolumesFigure 13-20 Radio Statistics Information