200-301 · Question #1424
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 D. GigabitEthernet0/0. The router forwards the packet to GigabitEthernet0/0 because the destination IP 172.18.32.38 matches a route whose outgoing interface is GigabitEthernet0/0.
Question
Options
- A10.1.1.1
- B10.1.1.3
- CLoopback0
- DGigabitEthernet0/0
How the community answered
(37 responses)- A11% (4)
- B3% (1)
- C8% (3)
- D78% (29)
Why each option
The router forwards the packet to GigabitEthernet0/0 because the destination IP 172.18.32.38 matches a route whose outgoing interface is GigabitEthernet0/0.
10.1.1.1 is likely an IP address on an interface or a next-hop address, not a direct outgoing interface for the destination network.
10.1.1.3 is also likely an IP address on an interface or a next-hop address for a different network, not the direct outgoing interface.
Loopback0 is a logical interface used for router management or peering, not typically for forwarding user data packets to external destinations.
Based on standard routing principles, the router would perform a lookup in its routing table for the destination IP address 172.18.32.38 and select the route with the longest prefix match that points to GigabitEthernet0/0 as the egress interface for that destination network.
Concept tested: Router packet forwarding (routing table lookup)
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_fwd/configuration/xe-16/irp-xe-16-book/irp-ip-routing-intro.html
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