The PCAP file shows that the attacker is attempting to exploit a Cross-Site Scripting (XSS) vulnerability on the victim machine. XSS is a type of vulnerability that allows an attacker to inject malicious code into a web application. This malicious code can then be executed by the victim when they visit the web application.
In this case, the attacker is attempting to inject the following malicious code into the web application:
<script> alert ("Click here for important information regarding your account!
http://externalip.com/account.php"); </script>
This code will create a pop-up window that prompts the victim to click on a link. When the victim clicks on the link, they will be redirected to the attacker's website. The attacker can then use this website to steal the victim's personal information or to install malware on the victim's machine.
To prevent future attacks of this type, the security administrator should implement a host-based firewall rule to block traffic from the attacker's IP address. This will prevent the attacker from being able to communicate with the victim machine.

Explanation
The router is experiencing a resource exhaustion issue. The output from the command indicates that the CPU is consistently busy, with a 1-second average of 99 percent busy and a 1-minute average of 83 percent busy.
This indicates that the router is struggling to keep up with the demands placed on it, potentially due to a high volume of traffic or other factors. As a result, web pages are experiencing long load times. This is an example of resource exhaustion, where the router's resources are being overwhelmed and are unable to meet the demands placed on them. A DDoS attack, memory leak, or buffer overflow would not typically cause the symptoms described in the scenario.

Explanation/Reference: