(ISC)² CISSP Certified Information Systems Security Professional Official Study Guide

5 Basic Port Scanning Techniques

Apache Kafka Series - Kafka Security (SSL SASL Kerberos ACL)

Kafka Security Setup in AWS with SSL Encryption and Authentication, SASL Kerberos, ACL in Zookeeper

Learn Kafka Security, with encryption (SSL), authentication (SSL & SASL), and authorization (ACL). 
Encryption (SSL) for Apache Kafka
Authentication (SSL & SASL) for Apache Kafka
Authorization (ACL) for Apache Kafka

Authentication

Basic Concepts for the Kerberos Protocol

Cisco DevNet Sandbox: Collaboration Labs

CISS Cert Prep - 6 Security Assessment and Testing

CISSP Cert Guide, 2nd Edition Pearson

CISSP Cert Prep - 4 Communication and Network Security Part 1

CISSP Cert Prep - 4 Communication and Network Security Part 2

CISSP Cert Prep - 5 Identity and Access Management Part 1

CISSP Cert Prep - 5 Identity and Access Management Part 2

CISSP Cert Prep 2 - Asset Security

CISSP Cert Prep: 1 Security and Risk Management (Feb. 2018)

CISSP Cert Prep: 1 Security and Risk Management (Feb. 2018) Part 2