Which of the following security methods can be used to detect the DoS attack in order to enhance the security of the network?

A.
WLAN controller

B.
Spectrum analyzer

C.
Protocol analyzer

D.
WIPS

Explanation:
WIPS is used to detect the DOS attack in order to enhance the security of the network. Wireless intrusion prevention system (WIPS) is a network device that monitors the radio spectrum for the presence of unauthorized access points (intrusion detection), and can automatically take countermeasures (intrusion prevention). The primary purpose of a WIPS is to prevent unauthorized network access to local area networks and other information assets by wireless devices.

Answer A is incorrect. A wireless LAN controller is a device that is used in combination with Lightweight Access Point Protocol (LWAPP) to manage light weight access points in large quantities by the network administrator or NOC. The Wireless LAN controller is part of the Data Plane within the Cisco Wireless Model. The WLAN controller automatically handles the configuration of anywhere from 6 to 300 wireless access-points, depending on the model.

Answer B is incorrect. A spectrum analyzer, or spectral analyzer, is a device that is used to examine the spectral composition of some electrical, acoustic, or optical waveform. It may also measure the power spectrum. The analog and digital spectrum analyzers are as follows.
1. An analog spectrum analyzer uses either a variable band-pass filter whose mid-frequency is automatically tuned (shifted, swept) through the range of frequencies of which the spectrum is to be measured.
2. A digital spectrum analyzer computes the discrete Fourier transform (DFT), a mathematical process that transforms a waveform into the components of its frequency spectrum.

Answer C is incorrect. A protocol analyzer is a network diagnostic utility for viewing the current contents of a packet traveling on the network. Protocol analyzers are mainly used for performance measurement and troubleshooting. These devices connect to the network to calculate key performance indicators (KPI) to monitor the network and speed up troubleshooting activities.