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Category: 642-661

642-661-BGP -Configuring BGP on Cisco Routers Exam

Which of the following is the correct partial router configuration to cause updates from CK1

Refer to the partial topology diagram shown.Service Provider 1 (SP1) assigned the customer an AS number of 65275. Service Provider 2 (SP2) assigned an AS number of 65745 to Domain . Domain decides to use AS 65275 internally.Which of the following is the correct partial router configuration to cause updates from CK1 to SP1 to report a source AS of 65275, while updates from CK2 to SP2 report the source AS of 65745 in addition to AS 65275?
Exhibit:

SIMULATION

SIMULATION
Network topology exhibit

Domain .com recently issued a contract to ISP (AS 65020) to provide a second Internet connection their Boston location. A new router, Domain 3, will need to be configured to connect to the Internet Service Providers. It is necessary to configure this router to exchange routes with both ISPs, and to filter the routing advertisements out to the ISPs. The basic configuration for the new router has been entered. It is only necessary to complete the BGP configuration steps outlined below.
On the Domain 3 router:
Configure BGP to exchange routes with ISP-A (AS 65010). Configure BGP to exchange routes with ISP-B (AS 65020). Only announce the two local Ethernet LAN prefixes (172.16.1.0/24 and 172.16.2.0/24) to the ISPs.
Configure the appropriate as-path access-list to permit only locally originated routes to be advertised in outbound routing updates to the ISPs. Use as-patch ACL number 10 containing only one statement. Start the simulation by clicking on the local host icon.

SIMULATION

SIMULATION
Exhibit, Simulation

You work as a network engineer at Domain .com. An EBGP update about the 113.0.0.0/8 prefix is received by the router in the 51509 Sub-AS from AS 50809.
Tasks:
1. Identify the AS Path information as the 113.0.0.0/8 prefix propagated within the Confederation and to AS 52733 by selecting the correct AS-Path information from the available options.
2. Also identify if the update will be denied by any of the routers. Click on the update path to place an “X” on the respective router(s) that will deny the update.


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