Which approach can you use to implement IPv6-over-IPv4 tunneling?
A.
IPv4-compatible addressing
B.
dual-stack implementations
C.
IPsec
D.
GRE
Explanation:
The Juniper Networks Tunnel Services PIC operates on all Juniper Networks M Series Multiservice Edge Routers and T Series Core Routers and provides a number of key features that support the rich tunnelling services available on Juniper Networks router portfolio.Each tunnel PIC can simultaneously support a number of different tunnel types, facilitating a wide range of applications:
* IP-IP Encapsulation: IP-IP enables the transport of IPv4 and IPv6 over disparate IP infrastructures that may be owned by a third party or have disjointed capabilities or policies.
* Generic Routing Encapsulation (GRE): GRE is an alternative to IP-IP that supports IPsec and non-IP protocols such as MPLS, in addition to IPv4 and IPv6 over any
* IP infrastructure. Junipers implementation of GRE complies with RFC 1701 and RFC 1702.
* PIM Sparse Mode Encapsulation: PIM-SM encapsulation and de-encapsulation on source designated routers and rendezvous points (RPs) are supported.
* Logical Tunnels: Logical Tunnels create a virtual interface within the router that supports the interconnection of VPNs and communication between logical routers.
* Virtual Tunnels: Virtual Tunnels support virtual private LAN Service (VPLS).
* Multicast Tunnels: Multicast Tunnels are used to create Multicast Distribution Trees (MDTs), which transport VPN multicast packets across an RFC 2547bis Layer 3 VPN.Generic Routing Encapsulation (GRE) IPv6 tunnels GRE is a protocol that was developed by Cisco and for the purposes of IPv6 tunneling operates and is configured very much the same as manual tunnels. GRE itself is able to be used to tunnel over a diverse number of network layer protocols other than IPv4. When dealing with IPv6, a GRE tunnel can be used to tunnel IPv6 over IPv4 or IPv4 over IPv6. As with manual tunnels, when configuring GRE tunnels both the source and destination must be manually configured and each must support both IPv4 and IPv6.