The LD50 of nicotine is 50 mg/kg for rats and 3 mg/kg for mice. 0.5-1.0 mg/kg can be a lethal dosage for adult humans, and 0.1 mg/kg for children.
IPSec is a suite of protocols that provide security services at IP layer of TCP/IP stack i.e. Network Layer in OSI model. As Andy Lemke mentioned, IPSec suite comprises of two protocols to offer security to. 1. AH - Authentication Header Protocol.(Protocol no: 51) 2. ESP - Encapsulation of security payload Protocol.
The OSI Model stands for Open System Interconnection. This model  defines the seven layers of a network which are:    Application (7th Layer)  Presentation (6th Layer)â¦  Session (5th Layer)  Transport (4th Layer)  Network (3rd Layer)  Data Link (2nd Layer)  Physical (1st Layer)  .