CCIE CCIE Service Provider

Question 1

In MPLS L3VPN, which protocol is used to distribute VPN labels and VPNv4 routes between PE routers?

Accepted Answer

MP-BGP

Answer

LDP

Answer

RSVP

Answer

OSPF

Question 2

What is the purpose of a Route Distinguisher (RD) in MPLS L3VPN?

Accepted Answer

Making overlapping customer IP prefixes unique in the BGP table

Answer

Encrypting customer routes

Answer

Defining which routes to import into a VRF

Answer

Assigning MPLS labels

Question 3

What mechanism in MPLS service provider networks controls which VPN routes are imported/exported between VRFs?

Accepted Answer

Route Target (RT) community

Answer

Route Distinguisher

Answer

VPN label

Answer

BGP confederation

Question 4

In a service provider network, which IS-IS level is used for routing within a single area?

Accepted Answer

Level 1

Answer

Level 0

Answer

Level 2

Answer

Level 3

Question 5

What is the function of RSVP-TE (Resource Reservation Protocol - Traffic Engineering) in MPLS networks?

Accepted Answer

Signaling LSPs with bandwidth reservations for traffic engineering

Answer

Distributing IP routing information

Answer

Providing MPLS label distribution between adjacent routers

Answer

Encrypting MPLS tunnels

Question 6

Which BGP feature allows ISPs to aggregate customer routes and prevent specific customer prefixes from being advertised to the internet?

Accepted Answer

BGP aggregate-address with summary-only

Answer

BGP confederation

Answer

BGP route reflectors

Answer

BGP communities