Which three Layer 2 VPN pseudowire components are true? (Choose three.)
Click on the arrows to vote for the correct answerA. B. C. D. E. F.
Layer 2 VPN pseudowires are used to connect two sites over a Layer 2 infrastructure, allowing the transmission of Ethernet frames between the sites as if they were on the same LAN. A pseudowire is essentially a point-to-point connection between two provider edge (PE) routers. Here are the explanations for the three true components:
A. Attachment Circuit: This refers to the physical or logical interface on a CE (Customer Edge) device that connects to the provider network. The attachment circuit is the source or destination of the Layer 2 traffic that will be transported over the pseudowire.
D. Virtual Circuit Label: This is a label used to identify a pseudowire. It is used by the provider routers to forward traffic from one end of the pseudowire to the other. Each pseudowire has a unique virtual circuit label assigned to it.
E. Pseudowire Identifier: This is a unique identifier used to identify a pseudowire. It is used by the control plane protocols that set up and maintain the pseudowire. The pseudowire identifier is used by the PE routers to determine which pseudowire a received packet belongs to.
The other components mentioned in the question are not Layer 2 VPN pseudowire components:
B. Bandwidth Requirement: While bandwidth requirements are important considerations for designing a network, they are not a component of a Layer 2 VPN pseudowire.
C. Route Distinguisher and F. Route Target: These are components of a VPN route target (RT), which is used to control the distribution of VPN routes between different VPNs. While a Layer 2 VPN may use VPN RTs, they are not specific components of a pseudowire.