Objective 1.05 Distinguish IPv4 Versus IPv6 Query Including Differentiating IPv4/6 Transport Versus IPv4/6 Query Type and Extrapolating When Different Query Types Will Be Used on Different Transports 302 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A company is deploying a new application that will be accessed by both IPv4 and IPv6 clients. The application team wants to ensure that DNS resolution is fast and reliable. The BIG-IP DNS administrator is considering whether to use IPv4 or IPv6 transport for DNS queries. What is the most important factor to consider?

   • AThe choice of transport for DNS queries should match the client's network capabilities and the BIG-IP DNS listener configuration.
   • BIPv4 transport is more reliable than IPv6 transport for DNS queries.
   • CThe transport for DNS queries should be the same as the transport used for the application data.
   • DIPv6 transport is always faster than IPv4 transport for DNS queries.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A BIG-IP DNS administrator is troubleshooting a client that is not receiving AAAA records. The client is on a dual-stack network. The BIG-IP DNS logs show that the client's queries are arriving over IPv6 transport. What is the most likely reason the client is not receiving AAAA records?

   • AThe BIG-IP DNS system is configured to only return A records to clients on IPv6 transport.
   • BThe BIG-IP DNS system is not configured to respond to queries over IPv6 transport.
   • CThe client's DNS resolver is configured with an IPv4 address, so it cannot receive AAAA records.
   • DThe client is sending A queries, not AAAA queries, because its application is using an IPv4 socket.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   What does an AAAA DNS record represent?

   • AThe IPv6 routing table entry used by routers to forward packets.
   • BThe IPv4 address of a domain name, used for name resolution.
   • CThe IPv6 address of a domain name, used for name resolution.
   • DThe actual IPv6 packet that carries data between hosts.
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5. 4application · medium

   A company is migrating its public-facing website to a new hosting provider. The new provider only offers IPv6 addresses. The BIG-IP DNS administrator is updating the DNS records. What is the most important consideration for clients that are still on IPv4-only networks?

   • AThe A record should be kept and point to an IPv4 address that can be used as a fallback, or a translation mechanism like NAT64 should be implemented.
   • BThe AAAA record must be configured with a valid IPv6 address, and the A record should be removed to avoid confusion.
   • CThe BIG-IP DNS system should be configured to return the AAAA record only to IPv6-capable clients.
   • DThe AAAA record should be configured with an IPv4-mapped IPv6 address to allow IPv4 clients to connect.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A network engineer is troubleshooting a slow connection to a website. The BIG-IP DNS logs show that the client received an AAAA record in response to its query, but the subsequent data connection is failing. The engineer confirms the client is on an IPv4-only network. What is the most likely cause of the failure?

   • AThe AAAA record is malformed and contains an IPv4 address.
   • BThe client's DNS resolver is not configured to use IPv6 transport for DNS queries.
   • CThe BIG-IP DNS system is not configured to translate AAAA records to A records for IPv4-only clients.
   • DThe client received an AAAA record, but the network cannot route IPv6 packets, so the client cannot establish a connection to the IPv6 address.
   Reveal Solution Discussion Select an answer first