Do i need to be a technology expert in order to secure it?

Hello Everyone,
I received an offer from one of the top oil & gas employers in the gulf region. I will be responsible for server & desktop systems hardening, network security hardnening, and other IT security related tasks. One of the critical server systems that
i will be going to harden is Exchange 2010 server. I don't have much experience in Exchange except basic installation and creating couple of mailbox-enabled users. My question is, do i really need to know how the e-mail system works in order to secure it?
I mean my job is going to be a pure security job and i will not configure SMTP, POP3, connectors,..etc. The same applies to other technologies, for example, do i need to know how Lync, Hyper-V, System Center servers work first prior securing them?
Appreciate your prompt response.

Good point Paul and thank you.
I agree with you that having a strong knowledge on a specific technology will greatly help in the journey of securing it. However, in-depth understanding is not required as told by some info sec friends. For example, do you really need to know about technology's
installation software prerequisites, server roles placement, emails got stuck in the Queue, failure in the SMTP service, database maintenance, and stuff like that as a full time Exchange admin knows? Of course it will not hurt to get this knowledge but it
will hurt me in terms of time as i need to quickly focus on the security side of the equation.  I don't have the time to grab an Exchange cookbook of 780 pages and read them. I already have tens of security books that i need to read and finish.
What do you think?

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