Denial of Service

 

Denial of Service

Force a service to fast (It happens due to overload of services)

It cause a system or service to be unavailable

Attacker use advantage of a design failure or vulnerability

It may happen unintentional or may be intentional

Cause:

1. If there is low bandwidth and everyone try to download something

2. If an attacker attack any computer from multiple location

3. A loop without STP (STP stand for spanning tree protocol is a net work protocol that build a loop free logical topology for Ethernet network. The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them )

 

 

 

 

 

 

 

DDOS amplification

In This attack, attacker send very small attack but when it reach us it become larger attack protocols use for this are NTP, DNS, ICMP.

Ex. When we request for DNS key we get answer in large key.

Now attacker use this, he ask for small information but he get larger information in return, now if attacker ask this information to multiple computer all computer will send request to DNS server and all DNS server will send this information to web server.