PrepAway - Latest Free Exam Questions & Answers

Which two statements related to this deployment are true?

An L2VPN (draft-kompella-mpls-l2vpn) is established between two PE routers to provide connectivity between
two customer sites.
Which two statements related to this deployment are true? (Choose two.)

PrepAway - Latest Free Exam Questions & Answers

A.
BGP must be used for the control plane communications.

B.
Kompella encapsulation is used in the data plane communications.

C.
LDP must be used for the control plane communications.

D.
Martini encapsulation is used in the data plane communications.

Explanation:
Junos OS substantially supports t RFC 4447, Pseudowire Setup and Maintenance Using the Label Distribution
Protocol (LDP).
Martini uses directed LDP to signal the VPN label between the PE devices, Kompella uses BGP to signal the
VPN label between the PE devices.
https://www.juniper.net/documentation/en_US/junos15.1/topics/reference/standards/layer-2-
circuit.html

8 Comments on “Which two statements related to this deployment are true?

  1. donkeykong says:

    I believe the answer is AD

    Kompella can use martini encapsulation in the data plane because it helps in preserving and padding the information in the original L2 frame as it is relayed between PE devices.




    0



    0
  2. Chuck says:

    Options A and B, Final answer.

    Draft-martini called l2circuits, tends to be simpler to configure in small environments, as there is no need for a BGP infrastructure. Draft-martini uses LDP sessions for emulated VC signaling and do not provide for auto-discovery. However, the true benefits of draft-kompella L2VPNs (as well as BGP-based VPLS) come from scaling. As your environment supports large numbers of PE routers and l2circuits or VPLS endpoints, the autodiscovery features of BGP-based signaling mean less redundant configuration and less concurrent control plane connections.

    The data-plane signaling is the same for draft-martini and draft-kompella l2vpn, the only difference is the control plane infrastructure to establish and maintain the connections.

    There is neither nothing like Kompella nor martini encapsulation they both use same encapsulation from the following list.

    Encapsulation Type

    Identifies the layer 2 encapsulation, e.g., ATM, Frame Relay etc. The following encapsulation types are defined:

    Value Encapsulation
    0 Reserved
    1 ATM PDUs (AAL/5), atm-ccc
    2 ATM Cells
    3 Frame Relay
    4 PPP
    5 Cisco-HDLC
    6 Ethernet VLAN (unswitched), ethernet-ccc
    7 MPLS

    Etc.




    1



    0

Leave a Reply