Question $1$a$.$ Briefly explain Static and Dynamic IP Addressing Techniques,b$.$ List and explain any four common web vulnerabilities that you know.c$.$ Define Net$-$Centric ComputingQuestion$2$b$.$Explain the roles of firewalls in securing enterprise networks.List and explain any four security goals ofa computer network. CIAWhy do we need to protect enterprise network?Question $3$b$.$A$.$ Briefly explain two functions of each layer in OSI standard.Write the full meaning of esch of the following:POP$3$ouestion $4$SSLHTTPSTESC. Differentiate between tlireats and vulnerabilities using renl life example.. Briefly explain IP Address and Network Security$\mathrm{.}15$ marks$15$ marks$15$ marksb. List any three technical measures that can be used against network security threatItemize any five $(5)$ open$-$source tools that can be used for building web$-$based applications$15$ marks