Explanation/Reference:
Explanation:
Virtual private networks (VPNs) are used to provide administrative personnel with secure communication channels through security systems and into trust zones. They allow staff who perform system administration tasks to have access to ports and systems that are not allowed from the public Internet.
IPSec is an encryption protocol for point-to-point communications at the network level, and may be used within a trust zone but not to give access into a trust zone. TLS enables encryption of communications between systems and services and would likely be used to secure the VPN communications, but it does not represent the overall concept being asked for in the question. SSH allows for secure shell access to systems, but not for general access into trust zones.

In order to obtain and comply with certifications, independent external audits must be performed and satisfied.
Although some testing of certification controls can be part of an internal audit, they will not satisfy requirements.

Print spooling is not a metric for system performance; all the rest are.

Simple Object Access Protocol (SOAP) uses Extensible Markup Language (XML) for data passing, and it must rely on the encryption of those data packages for security. TLS and SSL (before it was deprecated) represent two commons approaches to using encryption for protection of data transmissions. However, they are only two possible options and do not encapsulate the overall concept the question is looking for. Tokenization, which involves the replacement of sensitive data with opaque values, would not be appropriate for use with SOAP because the actual data is needed by the services.

A bastion is a system that is exposed to the public Internet to perform a specific function, but it is highly restricted and secured to just that function. Any nonessential services and access are removed from the bastion so that security countermeasures and monitoring can be focused just on the bastion's specific duties. A honeypot is a system designed to look like a production system to entice attackers, but it does not contain any real data. It is used for learning about types of attacks and enabling countermeasures for them. A firewall is used within a network to limit access between IP addresses and ports. A proxy server provides additional security to and rulesets for network traffic that is allowed to pass through it to a service destination.