Last Updated on August 7, 2021 by Admin 3
Which of the following terms refers to a method that is used to pass IPv6 traffic over an IPv4-only network? (Select the best answer.)
- 6to4 tunneling
- 4to6 tunneling
- NAT64
- dual stacks
Explanation:
To pass IPv6 traffic over a network that supports only IPv4, a tunneling method is required, such as 6to4 tunneling. The 6to4 tunneling method encapsulates an IPv6 packet inside an IPv4 header. Routers on the IPv4only network recognize only the IPv4 header information? the IPv6 packet is simply carried as the data payload of the IPv4 packet.
The 4to6 tunneling method is the reverse of the 6to4 tunneling method. Routers on the IPv6only network recognize only the IPv6 header information. Therefore, IPv4 packets must be encapsulated inside an IPv6 header so that they can pass over the IPv6only network.
Network Address Translation 64 (NAT64) enables communication between IPv4only hosts and IPv6only hosts. NAT64 translates IPv4 packets to IPv6 packets and translates IPv6 packets to IPv4 packets. However, a NAT64 router must contain address mappings so that the router can correctly translate IPv4 and IPv6 addresses. NAT64 supports stateless and stateful address translation. When performing stateless translation, NAT64 uses algorithms to create a onetoone relationship between IPv6 addresses on the inside network and IPv4 addresses on the outside network. When performing stateful translation, NAT64 maps multiple IPv6 addresses to a single IPv4 address and keeps track of the state of each connection. Static mappings can also be applied manually.
Dual stacks are used so that a host or router can use IPv4 and IPv6 simultaneously. Dualstack devices are configured with an IPv4 address and an IPv6 address; thus a dualstack device can communicate directly with both IPv4 and IPv6 devices without requiring protocol translation. However, a network infrastructure capable of routing both IPv4 and IPv6 traffic is required.
To pass IPv6 traffic over a network that supports only IPv4, a tunneling method is required, such as 6to4 tunneling. The 6to4 tunneling method encapsulates an IPv6 packet inside an IPv4 header. Routers on the IPv4only network recognize only the IPv4 header information? the IPv6 packet is simply carried as the data payload of the IPv4 packet.
The 4to6 tunneling method is the reverse of the 6to4 tunneling method. Routers on the IPv6only network recognize only the IPv6 header information. Therefore, IPv4 packets must be encapsulated inside an IPv6 header so that they can pass over the IPv6only network.
Network Address Translation 64 (NAT64) enables communication between IPv4only hosts and IPv6only hosts. NAT64 translates IPv4 packets to IPv6 packets and translates IPv6 packets to IPv4 packets. However, a NAT64 router must contain address mappings so that the router can correctly translate IPv4 and IPv6 addresses. NAT64 supports stateless and stateful address translation. When performing stateless translation, NAT64 uses algorithms to create a onetoone relationship between IPv6 addresses on the inside network and IPv4 addresses on the outside network. When performing stateful translation, NAT64 maps multiple IPv6 addresses to a single IPv4 address and keeps track of the state of each connection. Static mappings can also be applied manually.
Dual stacks are used so that a host or router can use IPv4 and IPv6 simultaneously. Dualstack devices are configured with an IPv4 address and an IPv6 address; thus a dualstack device can communicate directly with both IPv4 and IPv6 devices without requiring protocol translation. However, a network infrastructure capable of routing both IPv4 and IPv6 traffic is required.
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