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It is highly recommended that you have an autoexec.cfg file since you need to lower your interpolation in order to join a team on a competitive game mode.

Download this file and put it in the Steam\steamapps\common\Left 4 Dead 2\left4dead2\cfg folder. Restart your game.

bind f3 "record 1;stop;sm_toggleready"
bind f4 "disconnect"
bind f5 "sm_spectate"
bind pgup "jointeam 2"
bind pgdn "jointeam 3"
bind t "sm_tank;sm_health"

cl_interp 0
cl_interp_ratio 0
cl_cmdrate 100
cl_updaterate 100
rate 100000

You can modify it as you wish.