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The first wireless-specific guideline is really a subset of the wired best practice of occasionally performing analysis As I stated previously, wireless networks introduce the need to look at more than throughput metrics at the port level We must analyze the RF behavior and ensure that coverage is still provided where it is needed This extra requirement is driven by the nature of RF communications Aside from implementing enterprise-class monitoring systems, the small business or home office will require occasional analysis and adjustments based on the results Wired and wireless networks require updated security solutions, but if history is our teacher, wireless networks may require such updates more frequently The nature of wireless communications allows for attacks to be made without physical access to the premises This fact may be the reason behind the more rapid discovery of vulnerabilities WEP was shown to be flawed in less than three years WPA and 80211i have a backward compatibility weakness when using TKIP that may allow for ARP poisoning or denial of service attacks, and this weakness was discovered within five years of ratification The problem is that these solutions (WEP and 80211i) are intended to provide wireless with security at or greater than the level of a wired network (WEP stands for Wired Equivalent Privacy) and yet they do not always achieve it Since new exploits are discovered periodically, we may be forced to change the security solution we re using every three to five years I am using a wired Ethernet port right now that was installed more than ten years ago no security changes have been needed to meet the level of a physical port because it is a physical port However, this issue of meeting wired equivalence may be less of an issue than the level at which it is often presented Do we really need to ensure that our wireless links are equivalent to our wired links Not if they are used for different things or if we can provide effective security at higher layers For example, some organizations require IPSec VPN tunnels for any wireless links that connect to sensitive data Finally, since the security settings of the wireless network are often stored in the APs and client devices, it is crucial that you remove the configuration settings before decommissioning the hardware If you leave the WPA passphrase (used with WPA-PSK) in the device s configuration settings, the next person to acquire the equipment may be able to retrieve the information and use it to gain access to your network The likelihood of this occurring is slim, but it doesn t take long to remove the configuration and it is likely that machines should be wiped before decommissioning them anyway
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WLANs can be simple networks consisting of a single AP and a handful of wireless clients, or they can be complex networks including hundreds of APs and thousands of clients Interestingly, both types of networks can benefit from optimization techniques WLANs may be optimized by performing any of the following actions:
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Select appropriate infrastructure hardware Remove or address interference issues Implement client load balancing Analyze the infrastructure capacity Resolve common WLAN problems
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4 provided coverage of the infrastructure hardware used on WLANs Remember that infrastructure hardware is the hardware that builds the access, distribution, or core layers of a network This hardware includes WLAN switches and controllers as well as the APs themselves The WLAN switches and APs may cooperate in a split-MAC model or in a single-MAC model It is important to choose the right model
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Single MAC Model (Edge, Autonomous, or Stand-Alone)
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When a single MAC model is used, it means that the APs contain all of the logic within them to perform MAC-layer operations All IEEE 80211 services reside within the AP, with the possible exception of security services when implementing 80211i The single MAC model is the oldest and is still very popular in small and medium-sized WLANs There are both costs and benefits of the single MAC model Single MAC model costs include:
Decentralized administration may require more ongoing support effort APs may be more expensive, because they have more powerful hardware Each AP may be able to handle fewer client stations
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