Question 36 of 240 from exam 400-351: CCIE Wireless Written Exam

Question 36 of 240 from exam 400-351: CCIE Wireless Written Exam


Which of the below devices can cause unintentional RF jamming attacks against an 802.11 wireless network? (Choose two.)



A. B. C. D.


The correct answers are B. Microwave Oven and C. Radar.

Microwave ovens and radar are both sources of electromagnetic radiation that operate in the same frequency bands as some 802.11 wireless networks. If a microwave oven or radar device is placed too close to a wireless network, it can cause interference that disrupts the operation of the network. This is known as unintentional RF jamming.

Microwave ovens operate in the 2.4 GHz frequency band, which is the same frequency band used by the 802.11b/g/n wireless standards. When a microwave oven is turned on, it emits electromagnetic radiation in this frequency band that can interfere with nearby wireless networks. This interference can cause a range of issues, including reduced network performance, dropped connections, and even complete network outages.

Radar devices operate in a number of frequency bands, including the 2.4 GHz and 5 GHz frequency bands used by some 802.11 wireless networks. Radar devices emit pulses of electromagnetic radiation that can also cause interference with nearby wireless networks. This interference can be particularly problematic for outdoor wireless networks that may be located near airports or military installations where radar devices are commonly used.

Rogue access points (answer A) are not a source of unintentional RF jamming attacks. Rather, they are unauthorized access points that are installed on a network without the knowledge or consent of the network administrator. They can be a security risk as they can be used to intercept and modify network traffic.

900 MHz cordless phones (answer D) operate in a different frequency band than most 802.11 wireless networks. While they could potentially cause interference with wireless networks operating in the 900 MHz frequency band, this frequency band is not commonly used for wireless networks.