200-301 Question 324
Single answerA network administrator is troubleshooting a connectivity issue and discovers that a host route exists in the router's routing table: 192.168.1.100/32 via 10.0.0.1. What does this route indicate, and in what scenario might such a route be used?
- A
The route is used to forward traffic destined for the entire 192.168.1.0/24 subnet through 10.0.0.1.
- B
The route is used to forward traffic destined only for the specific IP address 192.168.1.100 through 10.0.0.1.
- C
The route is a default route used when no other routes match the destination IP.
- D
The route is used to forward multicast traffic to 192.168.1.100.
Show answer and explanation
Correct answer: B
Explanation
Host routes are the most specific type of routes in the routing table, identified by a /32 prefix. They are used to route traffic explicitly to a single IPv4 address. In the given scenario, the host route 192.168.1.100/32 via 10.0.0.1 directs traffic destined for the IP address 192.168.1.100 to the next-hop address 10.0.0.1. These routes are often used for specific purposes, such as managing traffic for individual devices or ensuring precise routing in NAT or VPN configurations.
- A. Incorrect.
Incorrect: This explanation refers to a subnet route rather than a host route. A host route applies to a single IP address, not a subnet.
- B. Correct.
Correct: A host route, identified by the /32 prefix, is specific to a single IP address (192.168.1.100 in this case) and is used to forward traffic explicitly to that address using the specified next-hop IP (10.0.0.1).
- C. Incorrect.
Incorrect: A default route is represented as 0.0.0.0/0 and is not specific to a host route. This explanation does not apply to the scenario provided.
- D. Incorrect.
Incorrect: A host route does not define multicast traffic forwarding. Multicast routes typically involve multicast-specific protocols like PIM.