Flow data is a summary of network traffic that can be used to monitor and analyze network performance, utilization, and security. Flow data can provide information such as source and destination IP addresses, ports, protocols, bytes, packets, and timestamps. Flow data can be collected using protocols such as NetFlow, sFlow, or IPFIX. Flow data can help identify the source of network saturation without requiring a full packet capture, which would be impractical on a 40Gb connection with a 10Gb server.
Reference:
CompTIA Network+ N10-008 Certification Exam Objectives, page 51
CompTIA Network+ N10-008 Cert Guide, Chapter 11: Switching Technologies2

Explanation
Plenum cable is the most appropriate to use when running bulk cables in ceilings because it is designed to meet fire safety standards and reduce the risk of toxic smoke in plenum spaces, which are areas with air flow above or below floors.

Explanation
The ARP table is a database that is used by a device to map MAC addresses to their corresponding IP addresses. When a device sends a packet to another device on the same network, it uses the MAC address of the destination device to deliver the packet. The ARP table allows the device to determine the IP address of the destination device based on its MAC address.