Which of the following are features included in the 802.11 standard? (Choose all that apply)
Answer(s): A
Point-to-Point Protocol (PPP) - A protocol that provides router-to-router and host-tonetwork connections over both synchronous and asynchronous circuits. PPP is the successor to SLIP.An IEEE 802.11 mode that enables contention-free frame transfer based on a priority mechanism; stations are polled for the need for frame transmission. Enables time-bounded services that support the transmission of voice and video
Which of the following is a secure method of client device authentication onto a WLAN?
Answer(s): B
The IEEE 802.11 standard specifies two methods of authentication: Open System authenticationand Shared Key authentication. The simpler and also the more secure of the two methods is Open System authenticationOpen System AuthenticationOpen System authentication is a method of null authentication and is specified by the IEEE 802.11 as the default setting in wireless LAN equipment.Using this method of authentication, a station can associate with any access point that uses Open System authenticationbased only on having the right service set identifier (SSID). The SSIDs must match on both the access point and client before a client is allowed to complete the authentication process. Uses of the SSID relating to security will be discussed in Chapter 10 (Security).The Open System authentication process is used effectively in both secure and non-secure environments.Open System Authentication ProcessThe Open System authentication process occurs as follows:1. The wireless client makes a request to associate to the access point2. The access point authenticates the client and sends a positive response and the client becomes associated (connected)
A change in the direction and intensity of a group of waves after passing by an obstacle or the bending waves around an object is referred to as?
Diffraction occurs when the radio path between the transmitter and receiver is obstructed by a surface that has sharp irregularities or an otherwise rough surface. At high frequencies, diffraction, like reflection, depends on the geometry of the obstructing object and the amplitude, phase, and polarization of the incident wave at the point of diffraction. Diffraction is commonly confused with and improperly used interchangeably with refraction.
Attenuation is the term used to describe?
Attenuation is simply a reduction of signal strength during transmission. You represent attenuation in decibels (dB), which is ten times thelogarithm of the signal power at a particular input divided by the signal power at an output of a specified medium. For example, an office wall (i.e., medium) that changes the propagation of an RF signal from a power level of 200 milliwatts (the input) to 100 milliwatts (the output) represents 3 dB of attenuation. Consequently, positive attenuation causes signals to become weaker when traveling through the medium.When signal power decreases to relatively low values, the receiving 802.11 radio will likely encounter bit errors when decoding the signal. This problem worsens when significant RF interference is presentExcessive attenuation causes the network's throughput to decrease because of operation at a lower data rate and the additional overhead necessary to retransmit the frames. Generally, this means that the user is operating within the outer bounds of an access point's range. There's enough attenuation present to decrease signal power below acceptable values. At worst case, signal power loss due to attenuation becomes so low that affected users will lose connectivity to the network
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