Alcatel Lucent Interior Routing Protocols and High Availability Set 1

When two areas need to communicate and there is no area 0. ✘ When an area needs to traverse another area to reach area 0. ✘ When two areas are connected to area 0, but there is no direct path between them. ✘ When an area needs to connect directly to another area without using area 0. ✔

The term backbone router has the same definition as the term area border router. ✘ An OSPF network needs at least one area border router to function. ✘ Area border routers connect the backbone area to other areas in an OSPF network. ✘ By definition, an area border router must perform route summarization between areas. ✔

Hello, link state update, link state packet, link State acknowledgement, database description. ✘ Link state update, link state refresh, link state acknowledgement, database description, notification. ✘ Hello, link state refresh, link state update, link state acknowledgement, link state authentication. ✘ Hello, link state update, link state request, link state acknowledgement, database description. ✔

Manual route summarization can only be done on autonomous system border routers. ✘ Manual route summarization must be done on all the backbone routers to be effective. Manual route summarization is optional on the routers in non backboneareas. ✘ Manual route summarization is done on the ABRs. By default, automatic summarization is done; however, it may not be optimal for all networks. ✘ Manual route summarization is done on the ABRs. By default, no route summarization is done and all routes are advertised to all areas. ✔

IP packets sent to an IP multicast address. ✘ TCP packets sent to an IP multicast address. ✘ IP packets sent to an IP unicast address. ✘ UDP packets sent to an IP multicast address. ✔

An OSPF type 3 LSA is an intra-area LSA, generated by the ABR only when route summarization is configured. ✘ An OSPF type 3 LSA is an inter-area LSA, generated by the ABR only when route summarization is configured. ✘ An OSPF type 3 LSA is an inter-area LSA, generated by an ASBR to describe external routes. ✘ An OSPF type 3 LSA is an inter-area LSA, generated by the ABR to describe a route to neighbors outside the area. ✔

Configure IS-IS interfaces ✘ Enable IS-IS ✘ Configure level capabilities ✘ Specify an area address ✔

There are three types of LSPs: L1, L2 and L1/L2. ✘ An LSP packet contains the ATT bits and the IS-type bits. ✘ The lower the LSP sequence number, the more current the update. ✘ Separate databases are maintained for L1 ✔

CSNPs are used to maintain consistency in the link state database. ✘ CSNPs are advertised before an adjacency is formed with another router. ✘ There are two types of CSNPs: Level 1 and Level 2. ✘ CSNPs are advertised after an adjacency is formed with another router. ✔

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