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This was rather confusing if you compare with the rest of the ccna 200 301 syllabus pdf, e.g. they mention a service, and instead to highlight the security features use two paragraphs to describe the service and how works, advantages, etc. ( when this was already explained in previous chapters), may be good to refresh your knowledge, although in my case make me lost focus a bit.  ccna 200 301 syllabus pdf