0. 1 point for each correct option; 0 points if more options are selected than required. 1. When packets are traveling through a router: The router modifies the TTL field, decrementing it by one. The router maintains the same source and destination IP. The router changes the source physical address to the physical address of the exit interface. 2. Packets destined to which networks will require the router to perform a recursive lookup? non-directly connected to a interface 3. What statements are correct about the split horizon with poison reverse method of routing loop prevention? It is NOT enabled by default on all Cisco IOS implementations. It assigns a value that represents an infinite metric to the poisoned route. It sends back the poisoned route update to the same interface from where it was received. 4. A----0B1-----C A network administrator has enabled RIP on routers B and C in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A? B(config)# router rip B(config-router)# passive-interface S0/0 5. The show ip eigrp topology command has been run on R1: P means passive or stable A means active or unstable 6. show ip route: default route will be denoted by * O means OSPF, AD=110 D means EIGRP, AD=90 R means RIP, AD=120 7. router component: FLASH - stores IOS image ROM - stores/loads bootstrap and runs POST NVRAM - stores configuration file RAM - stores running configuration POST - power on self test, runs diagnostics on hardware 8. * What are two tasks that must be completed before two routers can use OSPF to form a neighbor adjacency? The routers must agree on the network type. The routers must use the same dead interval. 9. Which of the following are primary functions of a router? packet switching path selection 10. same as 2, show ip route, check on non-directly connected entries 11. if the destination is not shown in the routing table, it will take the default route. 12. configure a static route by the following two ways: ip route ip route 13. show cdp neighbor: all shown routers are neighbors -- they are directly connected cdp, cisco discovery protocol, is a layer 2 protocol. Unless "detail" is added to the command, layer 3 info is unknown. local interface is on the router where the command is issued; last column is the neighbor's interface 14. If a destination has two paths shown in the routing table, It will load balance the traffic 15. Link-state routing protocols: are aware of the complete network topology offer rapid convergence times in large networks flood link state info to all neighbors simultaneously 16. in a routing table, the value behind the AD is metric, in OSPF is cost. [AD/metric] 17. A router has learned about a network through static and dynamic routing processes. The priority order a router will take into a routing table, or the priority order of the route a router will take is C > S > D > O > R 18. When presented with multiple valid routes to a destination, what criteria does a router use to determine which routes to add to the routing table? longest prefix (largest /N) first, lowest administrative distance second, best metric. 19. RIP uses triggered updates to announce network changes if they happen in between the periodic updates. 20. split horizon: do not talk back 21. neglected. please review the old version of the distance-vector protocol loop problem prevention methods: http://www.eng.fsu.edu/~cisco/CCNA/ccna2_v31/start.html section 7.1 22. TTL field within an IP packet header limits the period of time or number of hops a packet can traverse through the network before it should be discarded . 23. Routers compare metrics to determine the best route. (smaller is better) 24. review show ip route info 25. supernet, minimum range of all included routes 4 x /24 should be /22; but you need to check if all routes are included the answer is /21 to accommodate all mentioned routes 26. IP overlap problem ==> subnet mask questions 27. level one routes, 2, skipped 28. excellent question: no default route or default route exists but not used ==> ip classless has been disabled (review Chapter 8) 29. the operation of routing with EIGRP: As new neighbors are discovered, entries are placed in a neighbor table. If hello packets are not received within the hold time, DUAL must recalculate the topology. The reported distance is the distance to a destination as advertised by a neighbor. The feasible distance is the metric of the current used route; or the distance from this router to the destination. Feasible successors have a reported distance smaller than the feasible distance. 30. configure EIGRP with all attached interface advertised 31. to propagate a default route though out the entire OSPF area from router A: Router_A(config-router)# default-information originate 32. Which of the following are required when adding a network to the OSPF routing process configuration? network address, wildcard mask, area ID {net 10.1.0.0 0.0.0.255 area 0} 33. What should be considered when troubleshooting a problem with the establishment of neighbor relationships between OSPF routers? (Ref: 8) OSPF interval timers mismatch interface network type mismatch 34. In OSPF with multiple paths to the same destination: The router installs all the equal cost paths in the routing table and performs equal cost load balancing to send packets out multiple exit interfaces. 35. What is the first step Link-State protocols take in building a shortest path first database? learn about directly connected networks 36. pay attention to the range of the /30 network 37. (Ref: 28) The network administrator issues the command no ip classless on Router1. The packet will be dropped if not specified. (cannot use default route) 38. The network administrator configures the router with the ip route 172.16.1.0 255.255.255.0 172.16.2.2 command. How will this route appear in the routing table? S 172.16.1.0 [1/0] via 172.16.2.2 39. 10A--R1--R2--R3--B172 The network administrator is testing network connectivity by issuing the tracert command from host A to host B. Given the exhibited output on host A, what are two possible routing table issues on the network? Router2 is missing a route to the 172.16.0.0 network Router3 is missing a route to the 10.0.0.0 network 40. EIGRP metric: use bandwidth and delay 41. Without any routing protocol configured, show ip route will show the directly conntected interfaces if they are assigned with a proper IP address and subnet mask. 42. supernet/summary address: /13 43. mind broadcast address 44. to get connected with WAN services, CSU/DSU, modem or DCE devices are needed. 45. Router booting sequence: boot, POST, load IOS from flash, load startup-config from NVRAM 46. enable secret encrypts password 47. show ip route, check routing path against routing table: via .0.17 48. sh cdp nei shows directly connected neighbors 49. if a static route does not show up in a routing table, you should enable the interfaces 50. about CDP: tests Layer 2 connectivity enabled by default on each interface provides information on directly connected devices that have CDP enabled 51. static has lowest administrative distance (next to directly connected) 52. OSPF network command v.s. /N 53. What will happen if interface Serial0/0/1 goes down on Router1? DUAL will query neighbors for a route to network 192.168.1.0. (because the RD of other choice is bigger than FD) 54. troubleshooting Use show and debug commands to determine if hellos are propagating. 55. the function of the OSPF LSU packet is to announce new OSPF information and to reply to certain types of requests 56. The JAX router needs the network 192.168.3.0 0.0.0.255 area 0 command. 57. Which three statements about routing protocols are true? EIGRP supports unequal cost load balancing. OSPF elects designated routers on multiaccess links. RIP does not advertise a route beyond a hop count of 15.