What are two characteristics of L2 circuits? (Choose two.)
A.
Routing instance configuration is required for L2 circuits to function correctly.
B.
Routing instance configuration is not required for L2 circuits to function correctly.
C.
BGP is required for L2 circuits to function correctly.
D.
BGP is not required for L2 circuits to function correctly.
Explanation:
B: You configure Layer 2 VPNs in a routing instance. As a result, Layer 2 VPNs have unique site and VPN
identifiers. However, Layer 2 circuits do not require a routing instance configuration and instead use an
alternate method of identifying circuits.
D: Layer 2 VPNs, like Layer 3 VPNs, require Border Gateway Protocol (BGP) for transport of traffic between PE
routers. In contrast, Layer 2 circuits do not require BGP. Instead, Layer 2 circuits rely on LDP and MPLS for
their operation.
http://www.juniper.net/techpubs/en_US/junos12.3/topics/concept/layer-two-circuits-overviewsolutions.html