Cisco BGP + MPLS

1.

What benefit does AToM provide to the service provider's customers?

By supporting Layer 2 VPNs, customers maintain control of their site-to-site routings over the WAN. By supporting Layer 3 VPNs, a full mesh of virtual circuits will not be required between the differentcustomer sites to enable optimal routing. By supporting secured Layer 3 VPNs, customers do not have to deal with the complexity of configuringIPSec. By supporting MPLS traffic engineering over ATM, customers can better utilize their WAN link. By supporting Diff-Serv QoS, AToM allows customers to deploy voice/video applications across the WAN.

2.

What is a benefit of CEF switching?

CEF supports IP source prefix-based switching using the FIB. CEF uses less memory than fast switching uses. CEF is less CPU intensive than fast switching is. CEF provides Netflow statistics with minimum CPU overhead. CEF allows multiple data planes to share a common control plane.

3.

With MPLS VPN-aware NAT, what additional information is tracked inside the NAT translation table?

RD information RT information VRF information Multi-protocol BGP prefixes MPLS Labels

4.

What is the purpose of the global configuration command, ip dhcp relay information option vpn?

enables the DHCP relay agent to insert the VPN suboptions to the BOOTP request enables the DHCP relay agent to convert the broadcast DHCP request to a unicast DHCP request to ashared DHCP server enables the DHCP relay agent to perform VRF-aware NAT before forwarding the DHCP request to a sharedDHCP server enables ODAP (On-Demand Address Pool) on the DHCP relay agent

5.

Which of the following could be called a VPN identifier in the MPLS/VPN architecture?

route target route distinguisher VRF VPN IPv4 address BGP site-of-origin (SOO) extended community attribute

6.

An OSPF LSA type 1 route is redistributed into MP-BGP. That same route is then redistributed back from MP- BGP into OSPF on another PE router. In this case, which LSA type on the destination CE router will the OSPF route appear as?

LSA type 1 LSA type 2 LSA type 3 LSA type 4 LSA type 5

7.

When using the redistribute ospf {process-id} command, which types of OSPF routes will be redistributed into BGP?

all internal (interarea and intra-area) OSPF routes all external OSPF routes all external OSPF routes except type 7 LSAs both internal and external OSPF routes only classful OSPF routes without the subnet option

8.

What best describes the following configuration example of allowas-in?
router bgp 100
address-family ipv4 vrf CustomerA
neighbor 195.12.4.5 remote-as 123
neighbor 195.12.4.5 activate
neighbor 195.12.4.5 allowas-in 2

permits incoming BGP updates defined by access-list 2 permits incoming BGP updates defined by class-map 2 permit incoming BGP updates defined by route-map 2 permits incoming BGP updates with no more than two occurrences of AS 100 in the AS path permits incoming BGP updates with no more than two occurrences of AS 123 in the AS path

9.

Using MPLS unicast IP forwarding, what will happen if an LSR receives an unlabeled incoming packet?

It will process switch the packet by doing a routing table lookup. It will forward the packet using the LFIB. It will forward the packet using the LIB. It will forward the packet using the FIB. It will drop the packet immediately.

10.

When using MPLS unicast IP forwarding, what will happen if an LSR receives an incoming labeled packet but the LSR can't find that incoming label in its LFIB?

The packet will be forwarded using the FIB. The packet will be forwarded using the LIB. The packet will be process switched by performing a route lookup in the routing table. The packet will be forwarded using the LFIB with an imp-null outgoing label. The packet will be dropped even if the IP destination exists in the FIB.

Cisco BGP + MPLS

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