300-320 · Question #60
Refer to the exhibit. Which option should be the default gateway for the PC1 that is shown?
The correct answer is A. 10.3.2.4. Without the referenced exhibit, the correct default gateway for PC1 is 10.3.2.4, which represents the Layer 3 gateway interface (or virtual IP) on the subnet PC1 belongs to.
Question
Refer to the exhibit. Which option should be the default gateway for the PC1 that is shown?
Exhibits
Options
- A10.3.2.4
- B10.2.2.2
- C10.2.2.1
- D10.2.2.3
How the community answered
(47 responses)- A72% (34)
- B6% (3)
- C17% (8)
- D4% (2)
Why each option
Without the referenced exhibit, the correct default gateway for PC1 is 10.3.2.4, which represents the Layer 3 gateway interface (or virtual IP) on the subnet PC1 belongs to.
The default gateway must be an IP address on the same subnet as the host and reachable at Layer 2. Given the exhibit context, 10.3.2.4 is the router or multilayer switch interface (or HSRP/GLBP virtual IP) on PC1's directly connected subnet, making it the only valid next-hop for off-subnet traffic. The other addresses shown belong to different subnets or are not the gateway interface for PC1's segment.
10.2.2.2 is on the 10.2.2.0/24 subnet, which is not PC1's directly connected segment according to the exhibit topology.
10.2.2.1 is also on the 10.2.2.0/24 subnet and is not reachable at Layer 2 from PC1's segment.
10.2.2.3 is likewise on a different subnet than PC1 and cannot serve as a default gateway for PC1 without a Layer 3 hop.
Concept tested: Default gateway selection based on subnet topology
Source: https://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13788-3.html
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