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You have to explain to a new technician where to locate the DEMARC in your infrastructure. Which of the following best describes that?
The room that works as a wiring closet, mostly located between your MDF and the end user nodes.
The point at which the communications network owned by one company is connected to the communications network owned by another company (i.e. ISP provider to the Company).
The storage area for network attached devices that are not directly connected to your servers.
The location where the plenum patch cable is run so that it can be punched down to the appropriate block.
DEMARC: the point where the ISP's network (WAN/Cloud) is connected to the facility's internal network (LAN). DEMARCs are located either outside the facility, or, more likely, in a closet that the ISP/Telco connects all outside phone and internet (T1/DSL/etc). MDF: Main Distribution Frame - main network rack, usually located in a location that is secured from access by non-company personnel. The DEMARC may or may not be co-located here DEMARC extension: an extension from the DEMARC to MDF Smart Jack: A "smart" DEMARC, that allows the Telco to do remote troubleshooting on their circuit up to the Point of Presence (POP)/DEMARC. Allows the Telco to remotely "Loopback" towards themselves for troubleshoting.
See: https://en.wikipedia.org/wiki/Networkinterfacedevice and https://en.wikipedia.org/wiki/Demarcation_point
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