3V0-25.25 Question #52: Real Exam Question with Answer & Explanation

Question

Options

• ATEP and RTEP networks must use separate physical NICs.
• BRTEP needs to be configured on only one edge node.
• CThe default MTU for the RTEP network is 1500.
• DDHCP must be used to assign IP addresses to the RTEP.

Explanation

In an NSX Federation deployment, which is a key component of multi-site VMware Cloud Foundation (VCF) architectures, the Remote Tunnel End Point (RTEP) is used specifically for inter-site communication. While standard TEPs (Tunnel End Points) handle overlay traffic within a single site (East-West), RTEPs facilitate the encapsulation of traffic that needs to traverse the Layer 3 network between different geographical locations. A critical design consideration for RTEP is the Maximum Transmission Unit (MTU). Within a local VCF site, jumbo frames (MTU 1600 or 9000) are highly recommended and often required for the Geneve overlay to account for encapsulation overhead. However, when traffic leaves a site to travel over a WAN or a provider's long-haul network, it often encounters physical infrastructure that only supports the standard internet MTU of 1500 bytes. According to VMware's "NSX Federation Design Guide," the default MTU setting for the RTEP configuration is 1500. This ensures that inter-site traffic can pass through standard routers and VPNs without being dropped due to size constraints. If the inter-site physical links support larger frames, this value can be increased, but 1500 remains the baseline compatible default.

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