300-320 · Question #685
Which answers are true about multipoint GRE? (Select two.)
The correct answer is C. It uses a single interface for all GRE peers. D. It uses the same subnet for all tunnels. Multipoint GRE (mGRE) is the foundation of DMVPN hub-spoke designs. Unlike point-to-point GRE, which requires a dedicated tunnel interface and a unique subnet per peer, mGRE uses a single tunnel interface on the hub router that can communicate with any number of spoke peers…
Question
Which answers are true about multipoint GRE? (Select two.)
Options
- AIt needs a unique subnet for each tunnel.
- BIt supports only unicast.
- CIt uses a single interface for all GRE peers.
- DIt uses the same subnet for all tunnels.
- EIt is used to encrypt traffic between multiple sites.
How the community answered
(34 responses)- A3% (1)
- C91% (31)
- E6% (2)
Explanation
Multipoint GRE (mGRE) is the foundation of DMVPN hub-spoke designs. Unlike point-to-point GRE, which requires a dedicated tunnel interface and a unique subnet per peer, mGRE uses a single tunnel interface on the hub router that can communicate with any number of spoke peers. All spokes share the same IP subnet on their tunnel interfaces, simplifying addressing and eliminating the need to provision separate /30 subnets per spoke. mGRE does not inherently encrypt traffic (that is handled by IPsec when combined in DMVPN), and it supports both unicast and multicast forwarding-making choices B and E false.
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