A question regarding EMI

WangMichael

A new AP has been installed and there are problems with packets being dropped. Which of the following BEST explains the packet loss?

A EMI
B XML injection
C DDoS
D Botnet

I choose answer 'C' but the official answer is 'A' . I search a round but can not find exact defintion what's EMI means, can someone help to me ? thanks

lsud00d

EMI stands for electromagnetic interference (which can result in noise and consequently dropped packets), here's a video from the man Professor Messer on the subject:

CompTIA Security+ SY0-301: 2.6 - Environmental Monitoring, EMI Shielding, and Video Monitoring | Professor Messer - CompTIA A+, Network+, Security+, Linux, Microsoft Technology Training

Also, while 'C' is the only possibly relevant answer, typically an AP (access point) itself wouldn't be DDoS'd. Here's a good article on L4 vs. L7 DDoS:

https://devcentral.f5.com/articles/layer-4-vs-layer-7-dos-attack#.UoMEb_nbPfQ

HTH

TechGuru80

You are reading too far into the question. Also a DDoS would be towards servers for example.

An AP is installed and immediately packets are dropping. The only answer that makes sense is EMI.

samurai86

Indeed EMI is the most likely issue to cause this problem.