I have a question which asks the following:
Suppose a router has the following CIDR entries in its routing table:
Net/Prefix Next Hop 128.96.39.0/24 Interface 0 128.96.39.128/25 Interface 1 128.96.40.0/25 Router 2 192.4.153.0/26 Router 3 default Router 4
For each of the following IP addresses, what does the router do if a packet with that address arrives?
- 128.96.39.10;
- 128.96.40.12;
- 128.96.39.151;
- 192.4.153.17;
- 192.4.153.90.
I know that /24
means that 24 bits are assigned to the network address meaning that 8 bits are assigned to hosts. How do I get the subnet mask from the IP address represented in decimal and then from there determine where the IP would go?
Well, the most specific subnet is always used first:
/25 is more specific then /24. In your example, this would mean:
The Router takes the route with the longest fitting subnet mask.
(i) interface 0 (ii) Router 2 (iii) interface 1 (iv) Router 3 (v) Router 4
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