When we talk about authentication in IPSec, do we mean message authentica- tion or entity authentication? Explain

What is a monomer? how do they form a ploymer from the view point of chemical bonding?

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.