Alcatel Lucent Virtual Private Routed Networks

1.

Which of the following about inter-AS model B VPRN is TRUE?

The ASBRs use MP-eBGP to peer with each other and exchange IPv4 routes between autonomous systems. The ASBRs use MP-iBGP to peer with PE routers in their autonomous system and exchange VPN-IPv4 routes. The ASBRs maintain a mapping of labels for IPv4 routes exchanged between autonomous systems. The ASBRs require per-VPRN configuration.

2.

Which of the following is a characteristic of inter-AS model C VPRN?

A data packet destined to a remote AS is encapsulated with three labels within the originating AS. The ASBR redistributes VPN-IPv4 updates to its ASBR eBGP peers. PE routers in different ASes exchange IPv4 routes directly between each other using eBGP. The advertising ASBR assigns a new label to the route before sending it via an MP-eBGP update to its ASBR peer.

3.

For Carrier Supporting Carrier (CSC) VPRN, which of the following is NOT applicable to both types of customer carriers: BGP/MPLS service providers and Internet service providers?

eBGP is used for route and label exchange between CSC-CE and CSC-PE routers. iBGP can be used to distribute routes between CSC-CE and PE routers. MP-iBGP is used to advertise routes between the CSC-PE routers. MP-iBGP is used to advertise end-customer and Internet routes directly between the PE routers.

4.

For the data packets in a VPRN, how is the inner label in an MPLS packet signaled?

Signaled via MP-BGP and used to identify the egress PE. Signaled via T-LDP and used to identify the customer VPRN. Signaled via MP-BGP and used to identify the customer VPRN. Signaled via RSVP and LDP and used to identify the egress PE. Signaled via RSVP and LDP and used to identify the customer VPRN.

5.

VPN-IPv4 addressing is made unique by defining an address structure consisting of:

A 64-bit Route Target followed by a 32-bit IPv4 address. A 64-bit Route Distinguisher followed by a 32-bit IPv4 address. A 32-bit Route Distinguisher followed by a 32-bit IPv4 address. A 32-bit Route Target followed by a 32-bit IPv4 address.

6.

On an Alcatel-Lucent 7750 SR, which CLI command displays the Route Target(s) associated to a prefix?

Show router bgp routes Show router route-table summary Show router bgp routes vpn-ipv4 detail Show router route-table

7.

Which of the following is not a valid BGP design for a network provider supporting VPRNs?

Full mesh of MP-BGP between all P devices Full mesh of MP-BGP between PE devices Route reflector configuration between PE devices Confederation configuration between PE devices

8.

When VPRN Outbound Route Filtering (ORF) is enabled, each PE sends its ORF list to its peer using which of the following BGP message types?

Open Update Route Refresh Notification

9.

Which of the following about BGP loops in a VPRN environment is TRUE?

Traditional BGP loop detection mechanisms are unable to detect a loop in a VPRN scenario. BGP loops are detected in a VPRN when the customer has separate sites using the same BGP autonomous system number. The Alcatel-Lucent 7750 SR rejects routes containing AS_PATH loops by default.

When "remove-private" is configured at a PE, all routes received from the associated CE will have private AS numbers removed.

10.

In a VPRN that uses MPLS transport tunnels, which of the following is NOT configured on the PE device?

MP-BGP for exchanging customer routes with other PEs. A routing protocol for exchanging customer routes with the CE. A label signaling protocol for defining transport tunnels between the PE and CE. MPLS for exchanging labels with other provider core devices.

Alcatel Lucent Virtual Private Routed Networks

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