200-301 · Question #951
Refer to the exhibit. A packet sourced from 172.18.33.2 is destined for 172.18.32.38. Where does the router forward the packet?
The correct answer is A. GigabitEthernet0/0. Based on typical routing table behavior, the router forwards the packet to GigabitEthernet0/0 because the destination IP address falls within a directly connected subnet on that interface.
Question
Refer to the exhibit. A packet sourced from 172.18.33.2 is destined for 172.18.32.38. Where does the router forward the packet?
Exhibits
Options
- AGigabitEthernet0/0
- BLoopback0
- C10.1.1.1
- D10.1.1.3
How the community answered
(39 responses)- A74% (29)
- B8% (3)
- C3% (1)
- D15% (6)
Why each option
Based on typical routing table behavior, the router forwards the packet to GigabitEthernet0/0 because the destination IP address falls within a directly connected subnet on that interface.
The destination IP address 172.18.32.38 belongs to the 172.18.32.0/24 subnet. Assuming the exhibit's routing table showed 172.18.32.0/24 as directly connected to GigabitEthernet0/0, the router would perform a longest prefix match and forward the packet out this interface as the destination is on a directly attached segment.
Loopback0 is a virtual interface primarily used for routing protocol stability or management, not typically for forwarding traffic to external network destinations.
10.1.1.1 would likely be a next-hop IP address for a different subnet, not a direct match for the 172.18.32.38 destination IP.
10.1.1.3 would also likely be a next-hop IP address for a different subnet, not a direct match for the 172.18.32.38 destination IP.
Concept tested: Router packet forwarding (routing table lookup)
Source: https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/26359-ip-routing-architecture.html
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