Workaround: None. This issue has been observed when the DNS did not resolve localhost to the loopback address in an IPv6 environment. Reviewing your network configuration may assist in resolving this issue.
Explanation: After all LSRs have been satisfied for a given router, the adjacent routers are considered synchronized and in a full state. Updates (LSUs) are sent to neighbors only under the following conditions:when a network topology change is detected (incremental updates)every 30 minutes15. What will an OSPF router prefer to use first as a router ID?a loopback interface that is configured with the highest IP address on the routerany IP address that is configured using the router-id commandthe highest active interface IP that is configured on the routerthe highest active interface that participates in the routing process because of a specifically configured network statementExplanation: The first preference for an OSPF router ID is an explicitly configured 32-bit address. This address is not included in the routing table and is not defined by the network command. If a router ID that is configured through the router-id command is not available, OSPF routers next use the highest IP address available on a loopback interface, as loopbacks used as router IDs are also not routable addresses. Lacking either of these alternatives, an OSPF router will use the highest IP address from its active physical interfaces.16. What are the two purposes of an OSPF router ID? (Choose two.)
Explanation: OSPF router ID does not contribute to SPF algorithm calculations, nor does it facilitate the transition of the OSPF neighbor state to Full. Although the router ID is contained within OSPF messages when router adjacencies are being established, it has no bearing on the actual convergence process.17. Refer to the exhibit. If no router ID was manually configured, what would router Branch1 use as its OSPF router ID?10.0.0.110.1.0.1192.168.1.100126.96.36.199Explanation: In OSPFv2, a Cisco router uses a three-tier method to derive its router ID. The first choice is the manually configured router ID with the router-id command. If the router ID is not manually configured, the router will choose the highest IPv4 address of the configured loopback interfaces. Finally if no loopback interfaces are configured, the router chooses the highest active IPv4 address of its physical interfaces.18. A network technician issues the following commands when configuring a router:
R3 will be elected BDR.The R4 FastEthernet 0/0 priority is 128.The R4 router ID is 172.16.1.1.R1 will be elected BDR.The router ID on R2 is the loopback interface.R2 will be elected DR.Explanation: R2 will be elected DR because it has the highest priority of 255, all of the others have a priority of 1. R3 will be elected BDR because it has the numerically highest router-ID of 192.168.1.4. The R4 router-ID is 172.16.1.1 because it is the IPv4 address attached to the loopback 0 interface.21. Refer to the exhibit. If the switch reboots and all routers have to re-establish OSPF adjacencies, which routers will become the new DR and BDR?Router R4 will become the DR and router R1 will become the BDR.Router R2 will become the DR and router R3 will become the BDR.Router R1 will become the DR and router R2 will become the BDR.Router R4 will become the DR and router R3 will become the BDR.Explanation: OSPF elections of a DR are based on the following in order of precedence:
Interface Fa0/0 has not been activated for OSPFv2 on router R2.Interface Fa0/0 is configured as a passive-interface on router R2.Interface S0/0 is configured as a passive-interface on router R2.Interface s0/0 has not been activated for OSPFv2 on router R2.Explanation: If a LAN network is not advertised using OSPFv2, a remote network will not be reachable. The output displays a successful neighbor adjacency between router R1 and R2 on the interface S0/0 of both routers.29. What is the recommended Cisco best practice for configuring an OSPF-enabled router so that each router can be easily identified when troubleshooting routing issues?Configure a value using the router-id command.Use the highest active interface IP address that is configured on the router.Use a loopback interface configured with the highest IP address on the router.Use the highest IP address assigned to an active interface participating in the routing process.Explanation: A Cisco router is assigned a router ID to uniquely identify it. It can be automatically assigned and take the value of the highest configured IP address on any interface, the value of a specifically-configured loopback address, or the value assigned (which is in the exact form of an IP address) using the router-id command. Cisco recommends using the router-id command.30. Which step in the link-state routing process is described by a router running an algorithm to determine the best path to each destination?
Firefox Upgrade NotesIf you installed Firefox version 188.8.131.52 or laterbefore you installed MP4, then after installing MP4you must remove this later version of Firefox and then reinstall it.(ID: 535210:1)
Thunderbird Upgrade NotesIf you installed Thunderbird version 184.108.40.206 or later beforeinstalling MP4 and then installed Thunderbird 220.127.116.11 from CD #2,you must remove the later version of Thunderbird and then reinstall it.(ID: 535215:1)