300-320 · Question #681
Which of the following can be used to provide scalable WAN connectivity that supports a very large number of remote sites (over 500 sites)?
The correct answer is A. Layer 3 MPLS VPN. Layer 3 MPLS VPN is the correct answer because it uses BGP to distribute routing information between PE (Provider Edge) routers. When a new site is added, only the PE router needs to be configured-not every other remote site. This hub-and-spoke signaling model scales to…
Question
Which of the following can be used to provide scalable WAN connectivity that supports a very large number of remote sites (over 500 sites)?
Options
- ALayer 3 MPLS VPN
- BVPLS
- CVPWS
- DPoint-to-point GRE tunnels
How the community answered
(18 responses)- A94% (17)
- C6% (1)
Explanation
Layer 3 MPLS VPN is the correct answer because it uses BGP to distribute routing information between PE (Provider Edge) routers. When a new site is added, only the PE router needs to be configured-not every other remote site. This hub-and-spoke signaling model scales to thousands of sites without a corresponding explosion in configuration complexity. By contrast, VPLS and VPWS require a full or partial mesh of pseudowires between PE routers, which does not scale well beyond a few hundred sites. Point-to-point GRE tunnels require N×(N-1)/2 tunnels for a full mesh, making them completely impractical at 500+ sites.
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