NRS1 Module 6

Question 1

Which service component on the PE router provides customer access to the service?

Answer 1

The Service Access Point (SAP).

Question 2

What type of transport tunnels are typically used to forward customer packets across the provider network?

Answer 2

MPLS tunnels.

Question 3

What labels are added to the customer data at the ingress PE router to support a VPN service?

Answer 3

A service label to determine what service the data belongs to.A transport label to carry the data to the egress PE.

Question 4

What are the characteristics of VPWS, VPLS and VPRN?

Answer 4

VPWS – Provides layer-2 point-to-point service and emulates a single leased line or circuit between two locations.VPLS – Provides layer-2 point-to-multipoint service and emulates a layer-2 LAN switch between two or more locations.VPRN – Provides layer-3 service and emulates an IP router interconnecting two or more sites.

Question 5

Which VPN service maintains a MAC FDB?

Answer 5

VPLS, because it emulates an Ethernet switch