Q and A: What are DOS and DDOS Attacks?

October 5, 2015 | Views: 4235

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Q and A: What are DOS and DDOS Attacks?


Q1. What is a DOS attack?
Ans: DOS attack is short for Denial of Service attack. An attacker sends a lot of garbage traffic to a server, such that it consumes all the resources on the server, rendering it unusable to the legitimate users. In the worst case, a DOS can cause the server to shut down temporarily.


Q2. Whats the difference between DOS and DDOS attacks?
Ans: When a DOS attack originates from hundreds of Botnets (aka compromised PCs), servers that are controlled by a BotMaster and are targeting another specific server or a group of servers is called a DDOS attack (Distributed Denial of Service). When a single server is used to flood the traffic, it’s called a DOS attack.


Q3. How can I identify such an attack?
Ans: You may experience unavailability of a web service or a site. Your access may denied to some servers or sites for a long period and you may see an obvious, sudden decrease in network performance.


Q4. How many types of DOS/DDOS attacks can be performed?
Ans: Types of DOS/DDOS attacks are numerous. Some of them include:
1. ICMP Flooding or Ping Flooding.
2. TCP SYN Flooding or UDP Flooding.
3. Permanent DOS attacks.
4. Distributed attack or DDOS.
5. Teardrop, Nuke etc.


Use this information for good in your pentesting efforts.

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