Here you have the best Alcatel-Lucent 4A0-101 practice exam questions
When a router receives an IP packet, but does not find a match in the routing table for the destination IP address, what actions are performed by the router?
When a router receives an IP packet and cannot find a match in the routing table for the destination IP address, it will drop the packet and send an ICMP Destination Unreachable message back to the source. This behavior is part of the Internet Control Message Protocol (ICMP), which is used by network devices to send error messages and operational information.
Which of the following statements regarding distance vectors protocols are true?
(Choose two answers).
RIPv1, RIPv2, and BGP are all considered distance vector protocols, even though BGP is often categorized as a path vector protocol, it is based on principles of the distance vector type. Distance vector protocols do exchange routing tables with their immediate neighbors and do not propagate the entire routing table beyond that. This characteristic is fundamental in differentiating them from link-state protocols.
Click the exhibit button.
In the topology shown, router R1 is an ASBR configured to export external routes to OSPF. How many type 4 LSAs will be present in the network?
In the provided network topology, router R1 is an ASBR (Autonomous System Boundary Router) that exports external routes to OSPF. Type 4 LSAs (ASBR Summary LSAs) are generated by ABRs (Area Border Routers) to inform other routers within the OSPF domain about the presence of an ASBR and how to reach it. Since there is only one ASBR (R1) in this network, only one Type 4 LSA will be generated by the ABR (R2) to summarize the routes to the ASBR. Therefore, there will be one Type 4 LSA present in the network.
Which of the following conditions will prevent an OSPF adjacency from reaching the full state? Choose three answers.
An MTU mismatch can prevent OSPF routers from forming an adjacency because OSPF expects the MTU to be identical on both sides of a link. An incorrect subnet mask will prevent OSPF routers from becoming neighbors as they must be on the same subnet to form a neighbor relationship. Similarly, having different Area IDs will prevent OSPF adjacency because OSPF routers need to have matching Area IDs to form an adjacency.
Click the exhibit button.
The following command sequence is executed on router R2:
✑ A: R2# configure router ospf router-id 10.10.10.99
✑ A: R2# configure router router-id 10.10.10.66
On router R1, what router ID appears for router R2 directly after these commands are executed?
When configuring a new router ID on an OSPF router, the change does not take effect immediately if the OSPF process is already running. The OSPF process must be restarted for the new router ID to take effect. Since both commands configuring the router ID were executed one after another, the initial router ID change to 10.10.10.99 would not be preempted by the subsequent change to 10.10.10.66 until the OSPF process is restarted. Therefore, the router ID appearing for router R2 directly after these commands are executed would be 10.10.10.99.