350-501 · Question #402
What is the primary role of a BR router in a 6rd environment?
The correct answer is C. It connects the CE routers with the IPv6 network. In a 6rd environment, the Border Relay (BR) router serves as the crucial gateway, connecting the customer-facing CE routers, which operate over an IPv4 infrastructure, to the native IPv6 network. It performs the necessary encapsulation and decapsulation of IPv6 traffic within…
Question
What is the primary role of a BR router in a 6rd environment?
Options
- AIt provides connectivity between end devices and the IPv4 network
- BIt provides IPv4-in-IPv6 encapsulation
- CIt connects the CE routers with the IPv6 network
- DIt embeds the IPv4 address in the 2002::/16 prefix
How the community answered
(30 responses)- A7% (2)
- B3% (1)
- C87% (26)
- D3% (1)
Why each option
In a 6rd environment, the Border Relay (BR) router serves as the crucial gateway, connecting the customer-facing CE routers, which operate over an IPv4 infrastructure, to the native IPv6 network. It performs the necessary encapsulation and decapsulation of IPv6 traffic within IPv4 tunnels to facilitate this connectivity.
The BR's role is specifically related to IPv6 connectivity over an IPv4 infrastructure, not general IPv4 connectivity for end devices.
6rd involves IPv6-in-IPv4 encapsulation, not IPv4-in-IPv6 encapsulation.
The Border Relay (BR) router in a 6rd environment is a key component that acts as the gateway between the 6rd domain (where IPv6 traffic is tunneled over IPv4) and the native IPv6 Internet. Its primary function is to connect the customer-edge (CE) routers, which handle the IPv6-in-IPv4 encapsulation for customer traffic, to the broader IPv6 network.
Embedding the IPv4 address into the IPv6 prefix describes how 6rd prefixes are constructed, not the primary operational role of the BR router.
Concept tested: 6rd Border Relay (BR) router function
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_6rd/configuration/xe-3s/6rd-xe-3s-book/6rd-overview.html
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