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An IPv6 address is a 128-bit address represented as a sequence of eight groups of 16-bit hexadecimal values. An IPv4 address is a 32-bit address represented as a sequence of four 8-bit integers. A Mac address is a 48-bit address represented as six groups of 8 bits values in hexadecimal. A web address consists of a protocol name, a server address, and a resource path (see ISC2 Study Guide, chapter 4, module 1 - Understand Computer Networking).

Only "Provide diligent and competent service to principals" contains the accurate text of the ISC2 code of ethics. Although a security professional should discourage unsafe practices, no direct reference to acting safely exists in the canons. Aside from society, the common good and infrastructure, security professionals are expected to protect public trust and confidence. Finally, they are expected to protect the profession, and not just advance and promote it.

In the code of ethics, we read "Provide diligent and competent service to principals", and not "Provide active and qualified service to principals."; all the other options are valid canons of the code of ethics (see ISC2 Study Guide Chapter 1, Module 5).

A hybrid cloud is a model that combines (i.e. orchestrates) on-premise infrastructure, private cloud services, and a public cloud to handle storage and service. A community cloud is an infrastructure where multiple organizations share resources and services based on common technological and regulatory necessities. Multi-tenancy refers to a context where several of a cloud vendor's customers share the same computing resources. A private cloud is a cloud computing model where the cloud infrastructure is dedicated to a single organization.

The ranges of IP addresses 10.0.0.0 to 10.255.255.254, 172.16.0.0 to 172.31.255.254, and 192.168.0.0 to 192.168.255.254 are reserved for private use (see ISC2 Study Guide, chapter 4, module 1, under Internet Protocol - IPv4 and IPv6). Therefore, the IP address 13.16.123.1 is the only address in a public range.

The data handling procedures are 'Classify', 'Categorize', 'Label', 'Store', 'Encrypt', 'Backup', and 'Destroy' (see ISC2 Study Guide, chapter 5, module 3).

Network intrusion detection systems (NIDS) are network devices that detect malicious traffic on a network. Host intrusion detection systems (HIDS) are applications that monitor computer systems for intrusion. Typically, HIDS are not concerned with network devices. A firewall is a device that filters incoming Internet traffic. Routers receive and forward traffic, but (typically) do not analyze it.

Defense in depth describes a cybersecurity approach that uses multiple layers of security for holistic protection (see ISC2 Study Guide Chapter 1, Module 3). According to the principle of Separation of Duties, no user should ever be given enough privileges to misuse the system on their own. The principle of Least Privilege dictates that users should be given only those privileges required to complete their specific tasks. Privileged Accounts are a class of accounts that have permissions exceeding those of regular users, such as manager and administrator accounts.

A lock is a device that prevents a physical structure (typically a door) from being opened, indicating that only the authorized person (i.e. the person with the key) can open it. A fence or a barrier will prevent ALL access. Turnstiles are physical barriers that can be easily overcome (after all, it is common knowledge that intruders can easily jump over a turnstile when no one is watching).

By definition, smoke detectors are fire protection devices employed for the early detection of fire. Firewalls are devices that filter incoming traffic, and are a type of logical preventive control. Bollards and turnstiles are types of physical preventive controls.