CORRECT TEXT
Out of which port on switch Sw-Ac3 would a frame containing an IP packet with destination
address that is not on a local LAN be forwarded?

Answer: See the explanation

Explanation:
To forward any packet with destination address other then the subnet network of the
switch, the switch usually forwards this IP packets to the layer 3 device example router connected
to it.
Step1: Find the default-gateway(Router or layer 3 device) configured on the switch.
use the Show run command to view the IP address used to configure default-gateway on the
switch.
Step2: Look for the router VLAN-R1 after using the show cdp neighbor detail command

Sample output of show cdp neighbor detail command for better understanding the output details
Device ID. C2950-1
Entry address(es):
Platform: Cisco WS-C2950T-24, Capabilities: Switch IGMP
InterfacE. FastEthernet0/0, Port ID (outgoing port): FastEthernet0/15 HoldtimE. 139 sec
Two things to notice from above output InterfacE. FastEthernet0/0 this statement provides that the
neighbor(c2950-1) is connected to fa 0/0 on the C3660-2 local switch.
Port ID (outgoing port): FastEthernet0/15 this explains that neighbor (C2950-1) uses fa 0/15 port
to reach C3660-2 switch.
FOR OUR QUESTION WE SHOULD LOOK FOR THE ROUTER VLAN-R1 corresponding details
and to which port it is connected on local switch Sw-Ac3.
Step3: The port number to which the routerVLAN-R1 is connected on switch Sw-Ac3 is used to
forward the packets with destination address that is not on a local LAN.