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Here offer in-depth coverage of several key aspects, including Layer 2 technologies, infrastructure security, dual-stack (IPv4/IPv6) architectures, VPN technologies, infrastructure services and automation - essential concepts that need to be understood for maintaining efficient yet safe and automated networks.

Layer 2 Technologies: These essential network layers form the backbone of local area networks (LANs), facilitating efficient data transfer between devices. We will cover fundamental concepts like Ethernet, Virtual Local Area Networks (VLANs), Spanning Tree Protocols (STP), and Link Aggregation Protocol (EtherChannel). Being familiar with Layer 2 technologies enables you to design and configure reliable and scalable LAN infrastructures.

Infrastructure Security: Whilst network infrastructure security may seem like a tedious and time-consuming endeavor, protecting data is of utmost importance for smooth operations and protection of sensitive information. Here we discuss various security mechanisms and best practices, such as access control lists (ACLs), port security protocols such as SSH/SNMPv3, and creating defense-in-depth strategies - by taking these precautionary measures you can lower risks to your network infrastructure while mitigating threats that threaten it further.

Dual-Stack (IPv4 and IPv6) Architecture: Transitioning from IPv4 to IPv6 is crucial in meeting the growing number of connected devices. Here, we explore dual-stack architecture which permits simultaneous operation of both protocols - IPv4 in this instance - so as to design networks which seamlessly accommodate both protocols. Understanding IPv6 addresses, routing rules, and tunneling mechanisms helps in designing networks to support both protocols seamlessly.

Virtual Private Networks (VPNs) provide secure remote access and site-to-site connectivity over public networks, offering secure remote access and site-to-site connectivity between sites. In this course we will explore various VPN technologies like IPsec (Internet Protocol Security) and SSL/TLS (Secure Sockets Layer/Transport Layer Security), providing secure communication across networks while maintaining privacy and confidentiality.

Infrastructure Services:
Our Infrastructure services enhance network functionality and support key operations. We will cover critical services like Network Time Protocol (NTP) for accurate time synchronization, Dynamic Host Configuration Protocol (DHCP) for automated IP address assignment, and Domain Name System (DNS) for name resolution - each implemented and managed effectively to ensure reliable operations and user experiences.

Automating Network Management:
Automation has dramatically transformed network management by streamlining tasks, increasing efficiency, and decreasing human errors. We will examine its advantages as well as key technologies like network programmability, software-defined networking (SDN), configuration management tools (such as Ansible Puppet Chef etc). Understanding automation principles enables network administrators to streamline operations while adapting quickly to rapidly shifting requirements of their network environment.

By mastering Layer 2 technologies, infrastructure security, dual-stack architecture, VPN technologies, infrastructure services and automation you can create and maintain robust and secure networks. Implementation of these fundamental concepts ensures efficient data transfer, protects against threats, supports both IPv4 and IPv6 protocols, enhances connectivity security connectivity features functionality while making for more automated network management approaches. By continually expanding your knowledge in networking you'll excel in this ever-evolving field of network engineering.