Internet RFCs and STDs ICSSCADA Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A SCADA engineer is designing a network for a remote oil pipeline. The network will use a mix of IPv4 and IPv6 devices. The engineer needs to ensure that the SCADA application, which uses TCP, can communicate across both address families. The application does not natively support IPv6. What is the most effective approach?

   • AReplace the application with one that supports IPv6.
   • BForce the application to use IPv6 by disabling IPv4 on all devices.
   • CUse a dual-stack implementation where the application runs over IPv4 and the network supports both IPv4 and IPv6.
   • DUse NAT64 to translate IPv6 traffic to IPv4 for the application.
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2. 17expert · hard

   An engineer is evaluating a new protocol for use in a safety-critical ICS application. The protocol is currently a Proposed Standard. The engineer is concerned about stability and long-term support. What should the engineer do?

   • AUse the protocol only in non-critical parts of the system.
   • BWait until the protocol reaches Internet Standard status before deploying it.
   • CAdopt the protocol immediately, as it is on the standards track.
   • DImplement the protocol with a fallback to an older standard.
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4. 18application · medium

   A SCADA network engineer is reviewing the status of a protocol specification that the vendor claims is 'standardized.' The engineer finds that the specification is published as an RFC with the status 'Proposed Standard.' The vendor's product implements this RFC. What should the engineer understand about this specification's maturity and stability?

   • AIt is a Draft Standard, meaning it is stable but not yet final.
   • BIt is a Proposed Standard, which is a published RFC that may still undergo changes before becoming a full Internet Standard.
   • CIt is an Internet-Draft that is still under development.
   • DIt is a mature Internet Standard that is unlikely to change.
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5. 19foundation · easy

   What does an STD number represent in the RFC series?

   • AA unique identifier for a specific Internet Standard that may be associated with multiple RFCs.
   • BThe sequential order in which RFCs were published.
   • CA classification of the RFC's maturity level.
   • DA code indicating the working group that authored the RFC.
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6. 20expert · hard

   A vendor proposes a new protocol for a smart grid application. The protocol is currently an Internet-Draft. The utility's security team requires that any new protocol be based on a published RFC. The vendor argues that the draft is stable and will become an RFC soon. What is the best course of action?

   • AReject the protocol until it becomes a Proposed Standard RFC.
   • BAccept the draft but require the vendor to sign a liability waiver.
   • CUse the draft but keep it isolated from the production network.
   • DAccept the draft because it is stable and will become an RFC soon.
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