Which of the following is an extension of the public telephone network into a business?
A)PBX
B)COTS
C)SNMP
D)SMTP

Question

Quizplus · Accepted Answer

PBX (Private Branch Exchange) is a system that extends the public telephone network into a private business environment by dividing the main line into multiple extensions that can be used by different people within the organization. COTS (Commercial off-the-shelf), SNMP (Simple Network Management Protocol), and SMTP (Simple Mail Transfer Protocol) are not related to extending the public telephone network into a business.

Which of the Following Is an Extension of the Public