I'm currently self studding for my CCNP ONT certification Exam.
I read the official certification guide for this exam from Cisco Press. But, some point are still confuse for me :
1- Why WRED is most deploy on cores devices then all devices in Enterprise Network ? (The author saied :"Because WRED is usually applied to network core router....") And which implementation of congestion management system I should deploy on none core device, because thoses can also experience congestion in some point of the day and tail drop should be avoid also on thoses (distribution and access devices) devices also if I understand correctly ?
2- I understand WRED is an evolution of RED. Is still exist some reason to choose to use RED over WRED ? If WRED is available in device, is the RED is also available ? In my book in the example it say to activate WRED the command is RANDOM-DETECT, what about to activate RED ?
3- I do not understand why RED created or do not TCP global synchronisation.... (in my understand the author is contradict himself... maybe due to gate language)