IPv6 questions test address types (global unicast, link-local, multicast, anycast), address assignment (SLAAC, DHCPv6, EUI-64), OSPFv3, and dual-stack. The CCNA often presents an IPv6 address and asks you to identify the prefix, type, or calculate the EUI-64 interface ID.
Start Scenario PracticeWhich THREE of the following are required for successful operation of OSPFv3 in an IPv6 service provider network?
Explanation: OSPFv3 requires interface-level activation using the 'ipv6 ospf <process> area <area>' command to enable the OSPFv3 process on a specific interface and associate it with an area. Without this, the interface will not participate in OSPFv3 neighbor discovery or routing updates, even if the process is configured globally.
In IS-IS, which type of LSP is used to advertise prefix information for IPv4 and IPv6 in a modern SP network that supports traffic engineering?
Explanation: TLV 135 for IPv4 (extended IP reachability) and TLV 236 for IPv6 (IPv6 reachability) are used in IS-IS for prefix advertisement.
An SP network is running OSPFv3 for IPv6 and needs to support traffic engineering extensions for RSVP-TE. Which three statements about OSPFv3 TE extensions are true?
Explanation: OSPFv3 uses Opaque LSA types 9, 10, and 11 for TE, with Type 10 carrying TE information link-state. OSPFv3 TE requires the OSPFv3 process to be configured for TE.
In SRv6, which SID behavior is used to achieve L3VPN IPv6 VPN forwarding, where the SID points to a VPN instance and performs decapsulation and IPv6 lookup?
Explanation: End.DT6 is the SRv6 endpoint behavior for L3VPN over IPv6, performing decapsulation and lookup in the appropriate VPN routing table.
An ISP is implementing 6PE to provide IPv6 connectivity over an MPLS network that only supports IPv4 in the core. In 6PE, how are IPv6 prefixes carried across the MPLS backbone?
Explanation: 6PE uses MP-BGP to carry IPv6 prefixes (using the IPv6 unicast address family, AFI=2 SAFI=1) with an IPv4 next-hop address (the loopback of the peer 6PE router). The BGP session is over IPv4, but the NLRI carries IPv6 prefixes. MPLS labels are used to forward traffic across the IPv4-only core. It is important to note that 6PE does not use the VPNv6 address family (AFI=1 SAFI=128) — that is used for MPLS L3VPN.
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Practice all IPv6 Configuration ScenariosIPv6 questions test address types (global unicast, link-local, multicast, anycast), address assignment (SLAAC, DHCPv6, EUI-64), OSPFv3, and dual-stack. The CCNA often presents an IPv6 address and asks you to identify the prefix, type, or calculate the EUI-64 interface ID. These appear throughout the 350-501 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 350-501. Practicing each scenario type ensures you're ready for any format.
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