Comprehensive and Detailed Step-by-Step Explanation:To determine the correct device, we need to understand how a DOCSIS (Data Over Cable Service Interface Specification) network functions in a Small Office/Home Office (SOHO) environment:
* C. Cable Modem:
* A cable modem is required to convert the signal provided by the ISP (Internet Service Provider) over a DOCSIS network into a format that is usable by the local area network (LAN).
* DOCSIS is a standard for high-speed internet over cable television infrastructure, and the cable modem acts as the gateway between the ISP's coaxial network and the LAN.
* Without the cable modem, devices in the LAN would not be able to access the internet.
Reference: CompTIA A+ Core 1 Exam Objectives (220-1101), Domain 2.2 - Compare and contrast Internet connection types, network types, and their features.
Incorrect Options:
A: Switch:
A switch is used to connect multiple devices within the LAN. It does not connect the LAN to the ISP's DOCSIS network.
B: Firewall:
While firewalls provide security by managing inbound and outbound traffic, they do not serve as the interface between the ISP and LAN.
D: Router:
A router directs traffic between different networks (e.g., between a LAN and the internet). However, in a DOCSIS network, the cable modem is the device that first connects to the ISP. Many modern cable modems also include built-in routers, but the modem is the primary device needed.
E: Access Point:
An access point provides wireless connectivity within the LAN. It does not connect directly to the ISP or handle DOCSIS signals.
Key Takeaway:The correct device required to interface between the ISP's DOCSIS network and the SOHO LAN is the cable modem.