Each of these vlans has one host each on its port SVI on vlan 1 - ip 192.168.1.11 with snm Switch B - 
Ports 3， 4 connected to ports 3 and 4 on Switch A 
Port 15 connected to Port on Router. 
Tasks to do 
1. Use non proprietary mode of aggregation with Switch B being the initiator -- Assumed use LACP with B being in Active mode 
2. Use non proprietary trunking and no negotiation -- Assumed use switchport mode trunk and switchport trunk encapsulation dot1q 
3. Restrict only to vlans needed 
-- Assumed either vtp pruning or allowed vlan list. vtp pruning command did not seem to work on the simulator so landed using allowed vlan list 
4. SVI on vlan 1 with some ip and subnet given 
5. Configure switch A so that nodes other side of Router C are accessible -- Assumed this to mean that on switch A default gatway has to be configured. 
6. Make switch B the root 
-- Could not get this to work. Exam hung when I tried the command spanning-tree vlan 1，21-23 priority 4096