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Keep GRE underlay reachability independent of overlay routes to avoid recursive routing loops is relevant to the different engineering topic "GRE underlay route recursion", but it is not the most directly supported technical design or decision for this precise case: A customer assumes traffic inside GRE is cryptographically hidden from transit observers. the best answer here is: Use GRE to carry supported network payload protocols across a reachable IP underlay.

Account for added GRE and outer IP header overhead when sizing tunneled traffic is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported technical design or decision for this precise case: A customer assumes traffic inside GRE is cryptographically hidden from transit observers. the best answer here is: Use GRE to carry supported network payload protocols across a reachable IP underlay.

Use BPDU protection at true edge ports to react to unexpected switches is relevant to the different engineering topic "BPDU protection for edge ports", but it is not the most directly supported technical design or decision for this precise case: A customer assumes traffic inside GRE is cryptographically hidden from transit observers. the best answer here is: Use GRE to carry supported network payload protocols across a reachable IP underlay.

Review reverse underlay reachability and filter policy at both ends is relevant to the different engineering topic "GRE tunnel forwarding tests", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer assumes traffic inside GRE is cryptographically hidden from transit observers. the best answer here is: Clarify the need for separate encryption when confidentiality is required.

Verify IP protocol handling and security policy rather than changing only TCP port rules is relevant to the different engineering topic "GRE protocol and security limitations", but it is not the most directly supported implementation and troubleshooting step for this precise case: A customer assumes traffic inside GRE is cryptographically hidden from transit observers. the best answer here is: Clarify the need for separate encryption when confidentiality is required.

That option concerns Qualified-next-hop selection. GRE adds encapsulation but does not provide confidentiality or integrity as an encryption service by itself.

Bidirectional overlay packets are forwarded correctly is relevant to the different engineering topic "GRE tunnel forwarding tests", but it is not the most directly supported operational verification evidence for this precise case: A customer assumes traffic inside GRE is cryptographically hidden from transit observers. the best answer here is: The design distinguishes encapsulation from cryptographic protection.

The IPv6 service behaves correctly for expected packet sizes is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported operational verification evidence for this precise case: A customer assumes traffic inside GRE is cryptographically hidden from transit observers. the best answer here is: The design distinguishes encapsulation from cryptographic protection.

That option concerns Root protection policy. GRE adds encapsulation but does not provide confidentiality or integrity as an encryption service by itself.

Keep GRE underlay reachability independent of overlay routes to avoid recursive routing loops is relevant to the different engineering topic "GRE underlay route recursion", but it is not the most directly supported technical design or decision for this precise case: Two routers need a GRE connection using stable transport loopbacks. the best answer here is: Match GRE tunnel source/destination endpoints to reachable transport addresses.

That option concerns IS-IS authentication checks. A GRE interface requires valid encapsulation endpoints and uses underlay IP reachability to carry overlay packets.

Validate security and protocol support before selecting GRE for a service-provider application is relevant to the different engineering topic "GRE protocol and security limitations", but it is not the most directly supported technical design or decision for this precise case: Two routers need a GRE connection using stable transport loopbacks. the best answer here is: Match GRE tunnel source/destination endpoints to reachable transport addresses.

Configure a supported GRE tunnel and ensure proper underlay endpoints is relevant to the different engineering topic "GRE encapsulation purpose", but it is not the most directly supported implementation and troubleshooting step for this precise case: Two routers need a GRE connection using stable transport loopbacks. the best answer here is: Set the correct source/destination addresses and underlay routes.

Ensure a more specific underlay path to the peer exists outside the tunnel is relevant to the different engineering topic "GRE underlay route recursion", but it is not the most directly supported implementation and troubleshooting step for this precise case: Two routers need a GRE connection using stable transport loopbacks. the best answer here is: Set the correct source/destination addresses and underlay routes.

That option concerns MPLS route and forwarding tables. A GRE interface requires valid encapsulation endpoints and uses underlay IP reachability to carry overlay packets.

The intended overlay packets appear within GRE encapsulation is relevant to the different engineering topic "GRE encapsulation purpose", but it is not the most directly supported operational verification evidence for this precise case: Two routers need a GRE connection using stable transport loopbacks. the best answer here is: Encapsulated packets arrive at the intended peer.

Each customer's route is present in its intended table without unintended leakage is relevant to the different engineering topic "Routing-instance isolation", but it is not the most directly supported operational verification evidence for this precise case: Two routers need a GRE connection using stable transport loopbacks. the best answer here is: Encapsulated packets arrive at the intended peer.

The design meets both reachability and confidentiality requirements is relevant to the different engineering topic "GRE protocol and security limitations", but it is not the most directly supported operational verification evidence for this precise case: Two routers need a GRE connection using stable transport loopbacks. the best answer here is: Encapsulated packets arrive at the intended peer.

Use GRE to carry supported network payload protocols across a reachable IP underlay is relevant to the different engineering topic "GRE encapsulation purpose", but it is not the most directly supported technical design or decision for this precise case: A tunnel fails after a WAN interface's address changes. the best answer here is: Match GRE tunnel source/destination endpoints to reachable transport addresses.

That option concerns BGP IPv6 unicast family. A GRE interface requires valid encapsulation endpoints and uses underlay IP reachability to carry overlay packets.

Account for added GRE and outer IP header overhead when sizing tunneled traffic is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported technical design or decision for this precise case: A tunnel fails after a WAN interface's address changes. the best answer here is: Match GRE tunnel source/destination endpoints to reachable transport addresses.

Compare encapsulation overhead and effective tunnel MTU is relevant to the different engineering topic "GRE MTU and encapsulation overhead", but it is not the most directly supported implementation and troubleshooting step for this precise case: A tunnel fails after a WAN interface's address changes. the best answer here is: Review configured GRE endpoint addressing against the new transport path.

Check active transport route resolution for the outer destination is relevant to the different engineering topic "GRE underlay route recursion", but it is not the most directly supported implementation and troubleshooting step for this precise case: A tunnel fails after a WAN interface's address changes. the best answer here is: Review configured GRE endpoint addressing against the new transport path.

Check interface routing-instance membership and installed forwarding context is relevant to the different engineering topic "Routing-instance isolation", but it is not the most directly supported implementation and troubleshooting step for this precise case: A tunnel fails after a WAN interface's address changes. the best answer here is: Review configured GRE endpoint addressing against the new transport path.

That option concerns Provider bridging Q-in-Q. A GRE interface requires valid encapsulation endpoints and uses underlay IP reachability to carry overlay packets.

The design distinguishes encapsulation from cryptographic protection is relevant to the different engineering topic "GRE encapsulation purpose", but it is not the most directly supported operational verification evidence for this precise case: A tunnel fails after a WAN interface's address changes. the best answer here is: The remote endpoint is reached through a valid source route.

The required permitted GRE protocol traffic traverses the underlay is relevant to the different engineering topic "GRE protocol and security limitations", but it is not the most directly supported operational verification evidence for this precise case: A tunnel fails after a WAN interface's address changes. the best answer here is: The remote endpoint is reached through a valid source route.

That option concerns OSPFv3 neighbor formation. Encapsulation reduces available payload MTU and can trigger fragmentation or PMTUD behavior.

That option concerns GRE protocol and security limitations. Encapsulation reduces available payload MTU and can trigger fragmentation or PMTUD behavior.

Use GRE to carry supported network payload protocols across a reachable IP underlay is relevant to the different engineering topic "GRE encapsulation purpose", but it is not the most directly supported technical design or decision for this precise case: A tunneled application transfers small packets but large packets fail. the best answer here is: Account for added GRE and outer IP header overhead when sizing tunneled traffic.

Configure a supported GRE tunnel and ensure proper underlay endpoints is relevant to the different engineering topic "GRE encapsulation purpose", but it is not the most directly supported implementation and troubleshooting step for this precise case: A tunneled application transfers small packets but large packets fail. the best answer here is: Review tunnel MTU and supported PMTUD handling.

Inspect tunnel interface, encapsulation routes and return route availability is relevant to the different engineering topic "GRE tunnel forwarding tests", but it is not the most directly supported implementation and troubleshooting step for this precise case: A tunneled application transfers small packets but large packets fail. the best answer here is: Review tunnel MTU and supported PMTUD handling.

That option concerns VRRP virtual gateway failover. Encapsulation reduces available payload MTU and can trigger fragmentation or PMTUD behavior.