TCP/UDP is the protocol that has been used to apply the rule to block the web application www.abchacker.com in the above scenario. pfSense is a firewall and router software that can be installed on a computer or a device to protect a network from variousthreats and attacks. pfSense can be configured to block or allow traffic based on various criteria, such as source, destination, port, protocol, etc. pfSense rules are applied to traffic in the order they appear in the firewall configuration . To perform an analysis on the rules set by the admin, one has to follow these steps:
* Open a web browser and type 20.20.10.26
* Press Enter key to access the pfSense web interface.
* Enter admin as username and admin@l23 as password.
* Click on Login button.
* Click on Firewall menu and select Rules option.
* Click on LAN tab and observe the rules applied to LAN interface.
The rules applied to LAN interface are:

The first rule blocks any traffic from LAN interface to www.abchacker.com website using TCP/UDP protocol.
The second rule allows any traffic from LAN interface to any destination using any protocol. Since the first rule appears before the second rule, it has higher priority and will be applied first. Therefore, TCP/UDP is the protocol that has been used to apply the rule to block the web application www.abchacker.com. POP3 (Post Office Protocol 3) is a protocol that allows downloading emails from a mail server to a client device. FTP (File Transfer Protocol) is a protocol that allows transferring files between a client and a server over a network.
ARP (Address Resolution Protocol) is a protocol that resolves IP addresses to MAC (Media Access Control) addresses on a network.