You are asked to design a branch WAN. The branch sites have limited bandwidth and it is imperative to limit overhead. Which technology will satisfy the requirements?

Question

Options

• ASecure Vector Routing
• BGeneric Routing Encapsulation
• CIPsec
• DEVPN-VXLAN

• A
  86% (31)
• B
  8% (3)
• C
  3% (1)
• D
  3% (1)

Explanation

Secure Vector Routing (SVR) is specifically engineered for bandwidth-constrained branch WAN environments because it uses session-based forwarding instead of traditional tunneling, eliminating the per-packet encapsulation headers that other technologies impose - making it the clear choice when overhead must be minimized.

GRE (B) adds a fixed 24-byte header to every packet and provides no native security, making it costly on limited links. IPsec (C) provides strong encryption but introduces significant overhead through ESP/AH headers, IKE negotiation traffic, and packet expansion - valuable for security, but expensive on low-bandwidth WAN links. EVPN-VXLAN (D) is a data-center fabric technology that adds ~50 bytes of UDP/IP/VXLAN overhead per packet and is simply not designed for branch WAN scenarios.

Memory tip: Associate SVR with "Slim, Very lean Routing" - when the branch can't afford fat headers, SVR trims the overhead that tunneling protocols like GRE and IPsec can't avoid.

No community discussion yet for this question.