Single sign-on (SSO) is an authentication method that enables users to securely authenticate with multiple applications and websites by using just one set of credentials.

Explanation
A split-tunnel VPN is a configuration where only specific traffic is routed through a VPN, while the remaining data is sent directly over the internet. This can reduce the bandwidth consumption and cost of the company's internet connection, as cloud-based traffic does not need to pass through the VPN tunnel. A web filter, monitoring, and security are not advantages of a split-tunnel VPN, as they may require all traffic to go through the VPN.
https://www.auvik.com/franklyit/blog/vpn-split-tunneling/

Explanation
The subnet mask is a binary value that defines how many bits of an IP address are used to identify the network and how many bits are used to identify the host. The subnet mask also determines the size and number of subnets in a network. The ipconfig command shows the current IP configuration of a device, including the subnet mask. In this case, the subnet mask is misconfigured because it does not match the network address of the device. The device has an IP address of 192.168.1.55, which belongs to the network 192.168.1.0/24 (with a subnet mask of 255.255.255.0). However, the subnet mask is set to 225.225.225.224, which is an invalid value that does not correspond to any network prefix length. This causes the device to be unable to communicate with other devices on the same network or access the default gateway. References: CompTIA Network+ N10-008 Certification Study Guide, page 109; The Official CompTIA Network+ Student Guide (Exam N10-008), page 5-4.

netstat is a command-line tool that displays network connections, routing tables, interface statistics, and more.
It can help the technician identify which processes or applications are using the network bandwidth on the user's computer. netstat can also show the current bandwidth usage in bytes per second for each network interface.
References
* netstat - Wikipedia provides an overview of the netstat tool and its features.
* How to get current bandwidth usage from command line using built-in Linux tools? - Super User explains how to use netstat and other tools to monitor bandwidth usage on Linux systems.
* Get network utilization from command line - Super User shows how to use typeperf and other tools to monitor bandwidth usage on Windows systems.