R1: incorrecte default gateway in DHCP pool

  > ip dhcp pool Access
  > default router 192.168.10.1

R1: geen default route propagation

  > router ospf 1
  > no default-information originate

R2: default route propagation is noodzakelijk

  > router ospf 1
  > default-information originate

R2: incorrecte encapsulation S0/0/1

  > int s0/0/1
  > encqapsulation hdlc

R3: geen adjacencies met R2 of R1

  > router ospf 1
  > no passive-interface default
  > passive-int g0/1

S1: incorrecte port security

  > int fa0/1
  > switchport access vlan 10
  > switchport mode access
  > switchport port-security
  > switchport port-security mac-address sticky

S3: int G1/1 moet een trunkpooort zijn
 
  > int g1/1
  > switchport mode trunk

S4: port channel misconfig

  > int range f0/1-2
  > no channel-group 3 mode auto
  > channel-group 2 mode auto
  > 
  > int range f0/3-4
  > no channel-group 2 mode auto
  > channel-group 3 mode auto