The example provided (' OR ' '1'='1' --) is a classic example of an SQL injection attack. In an SQL injection attack, an attacker injects malicious SQL code into an application's input fields, often with the goal of bypassing authentication, manipulating the application's database, or extracting sensitive information. In this case, the attacker is attempting to bypass the password verification process by injecting SQL code that would result in a true statement ('1'='1'), potentially allowing unauthorized access.

The statement that best describes the least privilege principle in a cloud environment is that a single cloud administrator is configured to access core functions. The least privilege principle is a security principle that states that a user or a system should be granted only the minimum or the necessary privileges or permissions to perform their tasks or functions, and nothing more. The least privilege principle helps to reduce the attack surface, mitigate the risks, and limit the damage of a system or an organization, as it prevents unauthorized or malicious access, modification, or disruption of the resources or the data. In a cloud environment, the least privilege principle can be applied by configuring a single cloud administrator to access core functions, such as creating, deleting, or managing cloud resources, and by restricting or revoking the access of other users or systems to those functions. This way, the cloud administrator can perform their duties effectively and securely, and the cloud resources can be protected from unauthorized or malicious access or modification. Network segments remain private if unneeded to access the internet, internet traffic is inspected for all incoming and outgoing packets, or routing configurations are regularly updated with the latest routes are not the statements that best describe the least privilege principle in a cloud environment, as they are not related to the access or the permissions of the users or the systems. Network segments remain private if unneeded to access the internet is a statement that describes the network isolation or segmentation principle in a cloud environment, which is a security principle that states that a network should be divided into smaller or separate segments or subnets, and that only the necessary or authorized traffic should be allowed between them. Internet traffic is inspected for all incoming and outgoing packets is a statement that describes the network monitoring or inspection principle in a cloud environment, which is a security principle that states that a network should be observed and analyzed for any anomalies, errors, or incidents, and that any suspicious or malicious traffic should be detected and blocked. Routing configurations are regularly updated with the latest routes is a statement that describes the network optimization or maintenance principle in a cloud environment, which is a security principle that states that a network should be configured and managed to ensure the optimal and secure operation of the network, and that any changes or updates should be performed regularly and properly.
References: Official (ISC)2 Guide to the CISSP CBK, Fifth Edition, Chapter 3: Security Architecture and Engineering, page 202.