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NBNS Name query

By qjdflgf ·
On page 4 and 5 of Exam 640-802 By Todd Lammle.

Bob(source) doesn't know Sally(destination)'s IP and MAC. Bob tries resolve Sally's name:
Source Destination Prototol Info NBNS Name query NB Sally<00>

Following lines confused me:
Before the name is rresolved, the first thing Bob has to do isbroadcaset on the LAn to get ally's MAC address so he can communicated to her PC and resolve here name to an IP address:
Source Destination Prototol Info Broadcast ARP Who has Tell

How does the Bob know the if Bob received this IP address (from Sally), Are the lines below necessary because, I believe, when Sally sent out the IP must with MAC address already. I know quite little about NBNS. Maybe the book has missed some line?

Next, check out Sally's response ARP is at 00:0b:db:99:d3:5e NBNS query response NB


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