Free 642-889 Braindumps


  • Exam Number: 642-889
  • Provider: Cisco®
  • Questions: 186
  • Updated On: 19-Sep-2020


QUESTION: 1
Which type of VPN requires a full mesh of virtual circuits to provide optimal site-to-site
connectivity?

A. MPLS Layer 3 VPNs
B. Layer 2 overlay VPNs
C. GET VPNs
D. peer-to-peer VPNs

Answer(s): B
Explanation:
http://etutorials.org/Networking/MPLS+VPN+Architectures/Part+2+MPLSbased+Virtual+Private
+Networks/Chapter+7.+Virtual+Private+Network+VPN+Implementation+Options/Overlay+and+
Peer-to-peer+VPN+Model/

Two VPN implementation models have gained widespread use:
The overlay model, where the service provider provides emulated leased lines to the customer.
The service provider provides the customer with a set of emulated leased lines. These leased
lines are called VCs, which can be either constantly available (PVCs) or established on demand
(SVCs). The QoS guarantees in the overlay VPN model usual y are expressed in terms of
bandwidth guaranteed on a certain VC (Committed Information Rate or CIR) and maximum
bandwidth available on a certain VC (Peak Information Rate or PIR). The committed bandwidth

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