Which two options are limitations of stateful NAT64? (Choose Two)

A. It is unable to route VRF traffic.

B. It is unable to route multicast traffic.

C. It supports FTP traffic only with an ALG.

D. It supports DNS64 only.

E. Layer 4 supports TCP only






 

Suggested Answer: AB

Restrictions for Configuring Stateful Network Address Translation 64 "¢ Applications without a corresponding application-level gateway(ALG) may not work properly with the Stateful NAT64 translator. "¢ IP Multicast is not supported. "¢ The translation of IPv4 options,IPv6 routing headers,hop-by-hop extension headers,destination option headers,and source routing headers is not supported. "¢ Virtual routing and forwarding(VRF)-aware NAT64 is not supported. "¢ When traffic flows from IPv6 to IPv4,the destination IP address that you have configured mustmatch a stateful prefix to prevent hairpinning loops.However,the source IPaddress (source address of the IPv6 host) must not match the stateful prefix.If the source IP address matches the stateful prefix,packets are dropped.
Hair pinning allows two endpoints inside Network Address Translation(NAT) to communicate with each other,even when the endpoints use only each other's external IPaddresses and ports for communication. "¢ Only TCP and UDP Layer4 protocols are supported for header translation. "¢ Route maps are not supported. "¢ Application-level gateways (ALGs) FTP and ICMP are not supported. "¢ In the absence of apre-existing state in NAT64,stateful translation only supports IPv6-initiated sessions. "¢ If a static mapping host-binding entry exists for an IPv6 host,the IPv4 nodes can initiate communication. In dynamic mapping,IPv4 nodes can initiate communication only if a host-binding entry is created for the IPv6 host through a previously established connection to the same or a different IPv4 host. Dynamic mapping rules that use Port-Address Translation(PAT),host-binding entries cannot be created because IPv4-initiated communication not possible through PAT. "¢ Both NAT44 (static,dynamic and PAT)configuration and stateful NAT64 configuration are not supported on the same interface. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-3s/nat-xe-3s-book/iadnat-stateful-nat64.pdf

This question is in 300-101 Cisco Implementing Cisco IP Routing (ROUTE) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate




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