200-301 · Question #1114
Refer to the exhibit. A packet that is sourced from 172.16.3.254 is destined for the IP address of GigabitEthernet0/0/0. What is the subnet mask of the destination route?
The correct answer is D. 255.255.255.255. When a packet is destined for a router's specific interface IP address, the destination is treated as a host, requiring a host route with a 255.255.255.255 subnet mask.
Question
Exhibits
Options
- A0.0.0.0
- B255.255.254.0
- C255.255.255.0
- D255.255.255.255
How the community answered
(32 responses)- A3% (1)
- B9% (3)
- C3% (1)
- D84% (27)
Why each option
When a packet is destined for a router's specific interface IP address, the destination is treated as a host, requiring a host route with a 255.255.255.255 subnet mask.
A subnet mask of 0.0.0.0 represents a default route, which is used for all destinations not explicitly matched by other routes, not for a specific host.
A subnet mask of 255.255.254.0 (/23) would indicate a network range, not a route to a single, specific host IP address.
A subnet mask of 255.255.255.0 (/24) indicates a network range (e.g., 172.16.2.0/24), not a specific route to an individual IP address within that network.
A packet destined for the specific IP address of GigabitEthernet0/0/0 (172.16.2.1) represents a host route. Host routes are always identified by a subnet mask of 255.255.255.255, indicating that all bits of the IP address must match.
Concept tested: Host routes and subnet masks
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_static/configuration/15-mt/irs-15-mt-book/irs-static-route-cfg.html
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