# Computer Security - lesson 14
#### Stefano Zanero
###### 20 May 2016
## Network protocol attacks
The three common types of attacks are:
- Denial of Service: service unable to serve users
- Sniffing
- Spoofing

### Denial of Service
A __Killer packet__ is capable of bringing down the machine which is sent to.
Ping-o-death(ICMP) and Teardrop(TCP) Were two vulnerabilities with
the same principle of just handling cases provided by the standard,
and not handling abnormal or erroneous packets.

Attacks like __smurf__ are hardly fixed because the ones that have interest
of fixing the vulnerability are not the same ones that need to spend
the money in order to fix it.

### Sniffing
Switched networks as opposed to hub-based networks send to every host
only the packets that are destined to it, and also are faster.