Tier-1 SR Router Port: This port is used for ingress traffic on the Tier-1 Service Router (SR), which handles traffic as it enters the Tier-1 gateway.

Tier-1 SR Router Port: This port is used for ingress traffic on the Tier-1 Service Router (SR), which handles traffic as it enters the Tier-1 gateway.

The RouterLink port between a Tier-1 Gateway and a Tier-0 Gateway is automatically created when the Tier-1 Gateway is connected to the Tier-0 Gateway through the NSX UI. This link enables routing between the Tier-1 and Tier-0 gateways without the need for manual configuration of segments or logical switches.

According to the VMware NSX Documentation, these are two of the ways that you can use to configure Distributed Firewall on VDS:

NSX API: This is a RESTful API that allows you to programmatically configure and manage Distributed Firewall on VDS using HTTP methods and JSON payloads. You can use tools such as Postman or curl to send API requests to the NSX Manager node.

NSX UI: This is a graphical user interface that allows you to configure and manage Distributed Firewall on VDS using menus, tabs, buttons, and forms. You can access the NSX UI by logging in to the NSX Manager node using a web browser.

https://docs.vmware.com/en/VMware-NSX/4.1/administration/GUID-0DEF9F18-608D-4B5C-9175-5514750E901B.html

Virtual Tunnel Interfaces (VTI) are used in route-based VPNs. In this type of VPN, the tunnel is treated like a regular interface on the router. This allows for the configuration of routing protocols and the application of routing decisions to the traffic flowing through the VPN tunnel. VTIs simplify the management of routing and make it more flexible in VPN scenarios.

The insertion point for East-West network introspection in NSX is at the Guest VM vNIC (virtual Network Interface Card). By inspecting traffic at the vNIC level, NSX can monitor and apply security policies to traffic between virtual machines (East-West traffic) within the same network segment or data center, providing detailed security controls for VM-to-VM communication.

Distributed Firewall on VDS is a feature of NSX-T Data Center that allows users to install Distributed Security for vSphere Distributed Switch (VDS) without the need to deploy an NSX Virtual Distributed Switch (N-VDS). This feature provides NSX security capabilities such as Distributed Firewall (DFW), Distributed IDS/IPS, Identity Firewall, L7 App ID, FQDN Filtering, NSX Intelligence, and NSX Malware Prevention. To enable this feature, the following requirements must be met in the environment:

The NSX version must be  3.2 and later 1 . This is the minimum version that supports Distributed Security for VDS.

The VDS version must be  6.6.0 and later 1 . This is the minimum version that supports the NSX host preparation operation that activates the DFW with the default rule set to allow.

References :

Overview of NSX IDS/IPS and NSX Malware Prevention

A Service interface on the Tier-0 Gateway is required to make NSX Edge Services, such as NAT or load balancing, available to a VM on a VLAN-backed logical switch. The Service interface allows the Tier-0 Gateway to connect directly to the VLAN-backed network, enabling Edge Services to interact with VMs on that network.