Differential backups are advantageous because they only back up data that has changed since the last full backup. This means they require less storage space than taking a full backup every time, which can be significant as data accumulates over time. Additionally, differential backups are generally faster than full backups because they involve less data. This speed can be crucial for maintaining regular backup schedules without disrupting network operations. Lastly, because differential backups involve less data and take less time, they can be less expensive than full backups, considering the costs associated with storage and the time required for backup operations.
References: The Certified Network Defender (CND) program by EC-Council includes discussions on various backup strategies, including differential backups, as part of its comprehensive approach to network security. The program emphasizes the importance of efficient and effective backup strategies as a part of disaster recovery and business continuity planning12.

An incremental backup is a type of data backup that copies only the files that have been created or modified since the last backup operation of any type. This method is efficient because it only backs up data that has changed, which can save on storage space and reduce the time needed to complete the backup. In Kelly's case, since he is backing up only the new or changed files since the last backup, he is using an incremental backup approach.
References: The explanation aligns with the standard backup methodologies where an incremental backup captures only the changes made since the last backup, which can be either a full or another incremental backup1234.

A Web Application Firewall (WAF) validates traffic before it reaches a web application by using a rule-based filtering technique. This involves inspecting HTTP requests and applying predefined rules to identify and block potentially malicious traffic. The rules are designed to detect common web-based threats and vulnerabilities, ensuring that only safe traffic is allowed to reach the application. By analyzing parts of the HTTP conversation such as GET and POST requests, headers, query strings, and the body of requests, the WAF can effectively prevent data breaches and other attacks by blocking traffic that matches known malicious patterns12345.

Class addresses D and E are not allotted to hosts. Class D addresses are reserved for multicasting, and their address range can extend from 224 to 239. Class E addresses are reserved for experimental purposes. Their addresses range from 240 to 254.
Answer option C is incorrect. Class A addresses are specified for large networks. It consists of up to
16,777,214 client devices (hosts), and their address range can extend from 1 to 126.
Answer option D is incorrect. Class B addresses are specified for medium size networks. It consists of up to
65,534 client devices, and their address range can extend from 128 to 191.
Answer option A is incorrect. Class C addresses are specified for small local area networks (LANs). It consists of up to 245 client devices, and their address range can extend from 192 to 223.