a$.$ Configure G$0/1$ and G$0/2$ interfaces on S$1$ for trunking.

S$1($config$)$# interface range g$0/12$

S$1($config$-$if$)$# switchport mode trunk

b$.$ Configure VLAN $99$ as the native VLAN for G$0/1$ and G$0/2$ interfaces on S$1.$

S$1($config$-$if$)$# switchport trunk native vlan $99$

The trunk port takes about a short time to become active due to Spanning Tree Protocol. Click Fast Forward Time to speed the process. After the ports become active, you will periodically receive the following syslog messages:

$\%$CDP$-4-$NATIVE$\_$VLAN$\_$MISMATCH: Native VLAN mismatch discovered on GigabitEthernet$0/2(99),$ with S$3$ GigabitEthernet$0/2(1).$

$\%$CDP$-4-$NATIVE$\_$VLAN$\_$MISMATCH: Native VLAN mismatch discovered on GigabitEthernet$0/1(99),$ with S$2$ GigabitEthernet$0/1(1).$

You configured VLAN $99$ as the native VLAN on S$1.$ However, S$2$ and S$3$ are using VLAN $1$ as the default native VLAN as indicated by the syslog message.

Question:

Although you have a native VLAN mismatch, pings between PCs on the same VLAN are now successful. Explain