For a large-scale deployment with 30,000 hosts per location, capacity planning and high availability are critical for success. The number of hosts (D) is a primary factor in determining the required bandwidth for the IPsec tunnel and ensuring the selected Netskope Points of Presence (POPs) can handle the traffic volume. To maintain a resilient and continuous connection, it is a standard best practice to configure tunnels to redundant POPs (C). This involves setting up a primary tunnel to one POP and a secondary (failover) tunnel to another, ensuring service continuity if the primary POP becomes unavailable.

A. browsers in use: IPsec operates at the network layer (Layer 3). The tunnel forwards traffic from the network gateway, making the specific browser on an endpoint irrelevant to the tunnel's establishment.
B. operating systems: The IPsec tunnel is configured between a network device (e.g., firewall) and Netskope, not the individual hosts. Therefore, the operating system on the endpoints is not a consideration.

1. Netskope Official Documentation, "IPsec Configuration Guide": In the section on "High Availability," the guide explicitly recommends configuring tunnels to both a primary and a secondary POP for failover and redundancy. This directly supports option C.

2. Netskope Official Documentation, "Netskope NewEdge": The documentation on the NewEdge architecture and deployment planning emphasizes sizing considerations. The section on "Bandwidth and Sizing" states that the number of users (hosts) is a key metric for calculating the required bandwidth and selecting appropriate POPs to ensure performance. This directly supports option D.

3. Netskope Official Documentation, "Secure Web Gateway Deployment Guide": In the chapter covering traffic steering methods, the IPsec section highlights that planning must account for the total number of users and their expected traffic load to prevent performance bottlenecks. This reinforces the importance of considering the number of hosts (D).