Hi,
I have passed 642-436 one month ago.
a) there are some questions (about 10) about QoS:
CB-WFQ, LFI, cRTP, Traffic-shaping, WRR, WRED, number of calls with such codec + cRTP within a link ........
b) no labs but some CLI commands to choose to make GW, GK, CUBE ... to work
Regards
Guy