QUESTION 13 What type of BGP path attributes are propagated to BGP peers with the partial bit set even if they are not recognized? A. Optional Transitive B. Well Known Mandatory C. Optional Non-Transitive D. Well Known Discretionary Answer: A Explanation: Optional transitive. Attributes are passed on even if not recognized. Wrong Answer • B. Well known mandatory must be recognized • C. Non-transitive would not be propagated • D. Well known discretionary must be recognized . | Exam 642-661 Title Configuring BGP on Cisco Routers BGP Ver 642-661 QUESTION 1 Exhibit AS 65103 There is no direct physical connectivity between Certkiller3 and Certkiller5. The Transit AS 65102 is only running partial-meshed IBGP between Certkiller3 and Certkiller5 and is using OSPF as its IGP. Both Certkiller3 and Certkiller5 are using the next-hop-self options. The external BGP routes are not being redistributed into OSPF. BGP synchronization is disabled. What happens to the packet from AS 65101 to AS 65103 A. Packets will be black-holed because it will be dropped by Certkiller4. B. Packets will be black-holed because it will be dropped by Certkiller5. C. Packets will be black-holed because it will be dropped by Certkiller6. D. Packets can be transported via the Transit AS 65102 without any problems. Answer C Explanation Even with synchronization off testing 6 does not know how to route the packet because OSPF does not know about the route that BGP knows about. Synchronization being off assumes that there is a full mesh of BGP routers. QUESTION 2 Identify the most appropriate method to connect the customers to the ISPs to interconnect the two ISPs and to interconnect the router within each ISP. Place the methods in their correct locations in the diagram. - The Power of Knowing 642-661 Explanation Box1 EBGP 1 to ISP1. This is a multi-homed Internet connection. Box 2 IBGP Routers within ISP1 Box 3 EBGP Between ISP1 and ISP2 Box 4 IBGP Routers within ISP 2 Box 5 Static Routing Here is the catch . Because this is not a multi-homed connection the most appropriate method is static routes Box 6 EBGP 2 to ISP2. This is a multi-homed Internet connection. Most appropriate Answer QUESTION 3 By default NOT using the next-hop-self option what is the next-hop for the 8 BGP updates shown in the diagram Place the correct next-hops in their locations in the diagram. - The Power of .
