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Wireless LANs lend themselves to much larger hurdles relative to collisions In a wireless LAN, you cannot "hear" a collision like you can in Ethernet This is because the signal you are transmitting drowns out all of the other signals that could be colliding with it The signal is strongest at the source; so even though another signal sounds equally strong at the AP, from your STA, all you can hear is your signal Therefore, 80211b does not use the CSMA/CD arbitration method Instead, it has the ability to use two different methods of arbitration: CSMA/CA and request to send/clear to send (RTS/CTS) Normally, CSMA/CA works as follows: Before sending a data packet, the device sends a frame to notify all hosts that it is about to transmit data Then, all other devices wait until they hear the transmitted data before beginning the process to send their data In this environment, the only time a collision occurs is during the initial notification frame However, in the 80211 specification, this process works a little differently (because STAs cannot detect a collision period) Instead, the STA sends the packet and then waits for an acknowledgment frame (called an ACK) from the AP (in infrastructure mode) or from the receiving STA (in ad hoc mode) If it does not receive an ACK within a specified time, it assumes a collision has occurred and resends the data Note that an STA does not send data if it notices activity on the channel (because that would lead to a guaranteed collision) RTS/CTS works similarly to a modem Before sending data, the STA sends a request to send (RTS) frame to the destination If there is no activity on the channel, the destination sends a clear to send (CTS) frame back to the host This is done to "warn" other STAs that may be outside the range of the originating STA that data is being transferred, thus preventing needless collisions Figure 2-12 shows an example of this problem In general, RTS/CTS is used only for very large packets, when resending the data can be a serious bandwidth problem.

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TACACS+ Routers and switches need administration In a simple network, you can access the administration screen for each router and switch by entering a user name and password for each device When a network becomes complex, with many routers and switches, logging into each device separately starts to become administratively messy The answer is to make a single server store the ACL for all the devices in the network To make this secure, you need to follow the AAA principles Terminal Access Controller Access Control System Plus (TACACS+) is a proprietary protocol developed by Cisco to support AAA in a network with many routers and switches TACACS+ is very similar to RADIUS in function, but uses TCP port 49 by default and separates authorization, authentication, and accounting into different parts TACACS+ uses PAP, CHAP, and MD5 hashes, but can also use something called Kerberos as part of the authentication scheme

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These two standards are not mutually exclusive In some implementations, both are used in a sequential fashion to further reduce collisions Figures 2-13 through 2-16 demonstrate this In Figure 2-13, Station A sends an RTS packet, including the length of the data to be transmitted and the intended destination (Station B), to the rest of the WLAN The length field is included so that all STAs will have an estimated duration for the conversation and can queue packets accordingly

Up to this point almost all the authentication schemes we ve discussed are either based on PPP or at least take the idea of PPP and expand upon it Of course, every rule needs an exception and Kerberos is the exception here Kerberos is an authentication protocol that has no connection to PPP Twenty years ago some Internet folks began to appreciate that TCP/IP was not secure and, thus, designed Kerberos Kerberos is an authentication protocol for TCP/IP networks with many clients all connected to a single authenticating server no point-to-point here! Kerberos works nicely in a network, so nicely that Microsoft adopted it as the authentication protocol for all Windows networks using a domain controller The cornerstone of Kerberos is the Key Distribution Center (KDC), which has two processes: the Authentication Server (AS) and the Ticket-Granting Service (TGS) In Windows server environments, the KDC is installed on the domain controller (Figure 11-24)

Figure 2-13: Station A sends an RTS frame to Station B Station B then listens for traffic and, if none is present, releases a CTS packet to Station A, as shown in Figure 2-14

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