BGP Prefix Paths and SD-WAN

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Questions and Answers

Which direction must fec-egress be enabled in order for FortiGate to send parity packets?

  • Egress (correct)
  • Neither Ingress nor Egress
  • Both Ingress and Egress
  • Ingress

Which direction must fec-ingress be enabled in order for FortiGate to process parity packets sent by the remote FortiGate?

  • Both Ingress and Egress
  • Egress
  • Neither Ingress nor Egress
  • Ingress (correct)

What must be enabled on the firewall policy that matches the traffic you want to generate parity packets for?

  • FEC (correct)
  • Neither FEC nor Hardware Offloading
  • Hardware Offloading
  • Both FEC and Hardware Offloading

What does FortiOS automatically do on sessions that are subject to FEC?

<p>Manually disable hardware offloading (D)</p> Signup and view all the answers

What does FortiGate use for original and parity packets when FEC is enabled?

<p>Specific security payload index (B)</p> Signup and view all the answers

What does a packet capture taken using the example configuration show?

<p>Original and parity packets (C)</p> Signup and view all the answers

What is the impact of FEC on the quality of IPsec overlays?

<p>Positive impact (A)</p> Signup and view all the answers

What is the reported packet loss before enabling FEC?

<p>27% (D)</p> Signup and view all the answers

What is the reported packet loss after increasing fec-redundant to 3?

<p>1% (C)</p> Signup and view all the answers

What should you keep in mind when increasing the value of fec-redundant?

<p>Increased bandwidth usage (A)</p> Signup and view all the answers

Which of the following is true about FortiGate's default behavior when advertising BGP prefixes?

<p>FortiGate advertises one path per prefix by default. (B)</p> Signup and view all the answers

In the SD-WAN overlay deployment shown, how many paths does the hub reflect for each prefix?

<p>One path (C)</p> Signup and view all the answers

Why is it recommended to have sites learn all available paths to all possible destinations in SD-WAN?

<p>To ensure SD-WAN rules are not skipped. (C)</p> Signup and view all the answers

How many paths does the hub learn for the prefix 10.0.1.0/24 in the diagram on this slide?

<p>Two paths (D)</p> Signup and view all the answers

What are the next hop addresses for the two paths learned by the hub for the prefix 10.0.1.0/24?

<p>10.201.1.1 and 10.202.1.1 (B)</p> Signup and view all the answers

How many additional paths does the hub send in addition to the two paths it learns for the prefix 10.0.1.0/24?

<p>Two additional paths (C)</p> Signup and view all the answers

What is the purpose of configuring the spoke to receive any additional paths sent by the neighbor?

<p>To allow the spoke to learn all available paths for a prefix. (B)</p> Signup and view all the answers

How many routes does spoke2 receive for the prefix 10.0.1.0/24 from the hub?

<p>Four routes (C)</p> Signup and view all the answers

What does the routing table on spoke2 show for the prefix 10.0.1.0/24?

<p>Duplicate routes (B)</p> Signup and view all the answers

What does the hub do to the prefixes learned from clients?

<p>Reflects the prefixes to all peers. (C)</p> Signup and view all the answers

Which command can be used to view the identified paths in FortiGate's BGP configuration?

<p>get router info bgp network (C)</p> Signup and view all the answers

How can you control the number of selected identified paths to be advertised by the hub in FortiGate's BGP configuration?

<p>By enabling additional-path-select setting (A)</p> Signup and view all the answers

What does FortiOS 7.0.1 and 6.4.7 do with duplicate routes in the routing table?

<p>Consolidates them for cosmetic purposes (B)</p> Signup and view all the answers

What is the purpose of Forward Error Correction (FEC) in FortiGate's IPsec overlays?

<p>To reduce the number of retransmissions (C)</p> Signup and view all the answers

Which command can be used to configure FEC on an IPsec overlay in FortiGate?

<p>CLI configuration (B)</p> Signup and view all the answers

What happens if the fec-send-timeout period is reached in FortiGate's FEC configuration?

<p>FortiGate sends the parity packets regardless of fec-base (B)</p> Signup and view all the answers

Which SPI is used for both original and parity packets in FortiGate's FEC implementation?

<p>0x00000001 (D)</p> Signup and view all the answers

What is the purpose of parity packets in FortiGate's FEC implementation?

<p>To contain error-correcting data (A)</p> Signup and view all the answers

Which FortiGate version introduced the consolidation of duplicate routes in the routing table?

<p>FortiOS 7.0.0 and 6.4.7 (B)</p> Signup and view all the answers

What is the recommended use case for Forward Error Correction (FEC) in FortiGate's IPsec overlays?

<p>Delivering a better user experience for business-critical applications (B)</p> Signup and view all the answers

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