The best practice when traveling internationally with laptops containing Personally Identifiable Information (PII) is to do not take unnecessary information, including sensitive information. PII is any information that can be used to identify, contact, or locate a specific individual, such as name, address, phone number, email, social security number, or biometric data. PII is subject to various privacy and security laws and regulations, and must be protected from unauthorized access, use, disclosure, or theft. When traveling internationally with laptops containing PII, the best practice is to minimize the amount and type of PII that is stored or processed on the laptop, and to take only the information that is absolutely necessary for the business purpose. This can reduce the risk of losing, exposing, or compromising the PII, and the potential legal or reputational consequences. Using a thumb drive to transfer information from a foreign computer, connecting the laptop only to well-known networks like the hotel or public Internet cafes, and requesting international points of contact help scan the laptop on arrival to ensure it is protected are not the best practices when traveling internationally with laptops containing PII, as they may still expose the PII to various threats, such as malware, interception, or tampering, and may not comply with the privacy and security requirements of different countries or regions. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 1, Security and Risk Management, page 43. Official (ISC)2 CISSP CBK Reference, Fifth Edition, Chapter 1, Security and Risk Management, page 56.

Explanation/Reference:
Explanation:
CHAP (Challenge Handshake Authentication Protocol) is not used within IKE and IPSec.
Internet Key Exchange (IKE or IKEv2) is the protocol used to set up a security association (SA) in the IPsec protocol suite. IKE builds upon the Oakley protocol and ISAKMP. IKE uses X.509 certificates for authentication - either pre-shared or distributed using DNS and a Diffie-Hellman key exchange - to set up a shared session secret from which cryptographic keys are derived.
IKE phase one's purpose is to establish a secure authenticated communication channel by using the Diffie-Hellman key exchange algorithm to generate a shared secret key to encrypt further IKE communications. This negotiation results in one single bi-directional ISAKMP Security Association (SA).
The authentication can be performed using either pre-shared key (shared secret), signatures, or public key encryption.
Incorrect Answers:
B: Pre-shared key is an authentication method that can be used within IKE and IPsec.
C: Certificate-based authentication is an authentication method that can be used within IKE and IPsec.
D: Public key authentication is an authentication method that can be used within IKE and IPsec.
References:
https://en.wikipedia.org/wiki/Internet_Key_Exchange

In the Waterfall model (W.W. Royce, Managing the Development
of Large Software Systems: Concepts and Techniques, Proceedings,
WESCON, August 1970).
* answer "A complete, validated specification of the required functions, interfaces, and performance for the software product" defines the term requirements.
*Similarly, answer "To establish the fitness or worth of a software product for its operational mission", defines the term validation, and answer d is the definition of product design. In summary, the steps of the Waterfall model are:
System feasibility
Software plans and requirements
Product design
Detailed design
Code
Integration
Implementation
Operations and maintenance
In this model, each phase finishes with a verification and validation
(V&V) task that is designed to eliminate as many problems as
possible in the results of that phase.