Assume for the following questions that we are referring only to IPv4.1.) (3 points) The United States Computer Emergency Preparedness Team (US-CERT) publishes what this is called technical cybersecurity. Vulnerability Alerts and Notes and these documents alert users to potential threats to the security of their systems. Select a technical security alert or vulnerability note published within the last twelve months that has a network-related component and search for the reported issue and suggested solution (if available). Analyze and describe the problem and solution, paying particular attention. to the network-related issues it raises. We want to read your analysis, not a copy and paste of what's on the website. The list of recent technical security alerts is available at: http://www.us-cert.gov/cas/techalerts/ and the list of vulnerability notes is at http://www.kb .cert.org/vuls. I would like to describe the following security alertAlert (TA13-175A)Risks related to default passwords on the InternetDescription: Typically, factory default configurations for devices and embedded systems contain simple and open passwords publicly and the provider expects the user to change the password once he starts using them. systems for personal use. The alert concerns the risk of retaining these default passwords when using the system for personal purposes. Attackers can easily track and identify an Internet-connected system that uses default passwords and can hack your system or your entire network. Default passwords are readily available in the product documentation. Hackers can find these vulnerable systems using search engines like Shodan. Attackers use common attack techniques by logging in with a blank space, in the middle of a sheet of paper......and switching back to OS.10. The operating system then adds the IP address in the HTTP request and sends the data to the MIT server.5b.) What is DNS caching? How and why is it used? DNS is used to provide a mapping between the name of websites and their respective IP addresses. DNS caching is a mechanism to cache this website name – IP address mapping on the DNS server for a certain period of time. When a number of users in office or universities access the same websites again and again, DNS caching is used to improve system performance because the DNS server does not need to perform all hierarchical searches using root nameservers and TLD nameservers for each. each user request. The network will be too overloaded if we don't use DNS caching, because the DNS server has to make a number of DNS queries in order to find an IP address. DNS caching stores IP addresses of frequently used websites in the organization.