An Intermediate Distribution Frame (IDF) is used to extend the network from the Main Distribution Frame (MDF) to other areas of a building or campus. Installing switches in the IDF provides local connectivity while linking back to the MDF.

The MPO (Multi-fiber Push On) connector is designed to handle multiple fiber strands in a single connector, and it is commonly used with high-density transceivers like QSFP (Quad Small Form-factor Pluggable).
QSFP can support up to four channels (hence "quad"), and MPO connectors can interface multiple fibers (e.g.,
8, 12, 24), making them ideal for 40Gbps or 100Gbps deployments.
RJ45 (A) is used for Ethernet over copper.
ST (B) and LC (C) are single-fiber connectors - they don't support the multi-fiber needs of QSFP setups.
# Therefore, MPO is the correct connector type for this use case.
Reference:CompTIA Network+ N10-009 Official Study Guide - Objective 3.1: "Compare and contrast different types of connectors and transceivers."

In a split-tunnel VPN, only corporate traffic is sent through the VPN tunnel, while public internet traffic goes directly through the user's local ISP. This reduces bandwidth use on the corporate VPN concentrator and improves performance for non-work traffic.
B . Separate tunnels for encrypted traffic describes multi-tunnel VPNs, not split tunneling.
C . All traffic routed through on-site servers is a full-tunnel VPN, not split-tunnel.
D . ACLs balancing traffic relates to routing or load balancing, not VPN split tunneling.
Reference (CompTIA Network+ N10-009):
Domain: Networking Concepts - VPN types, split vs. full tunnel, remote access.

Verifying full system functionality occurs after implementing a fix. This step ensures the solution resolved the issue and that performance is back to expected levels. Comparing current throughput to baseline measurements is part of validation testing to confirm everything is within normal operational parameters.
* A. Implement the solution applies the fix but does not confirm results.
* C. Document findings happens at the end of troubleshooting.
* D. Test the theory comes earlier, when trying to confirm the suspected cause.
References (CompTIA Network+ N10-009):
* Domain: Network Troubleshooting - Troubleshooting methodology steps, baselines, verification testing.