Question by don: Network ID, Host ID, IP Address, Default Gateway and Subnet mask?

http://img527.imageshack.us/img527/3415/network0b.jpg

According to the Image:-

“IP Address: Unique Device (host) Address.”
What is a host?

“Default Gateway: IP Address of the Router on the Same Physical Segment”
What is a Physical Segment?

Best answer:

Answer by Tim the Tech
A host is a device that is using the IP address, like your PC or laptop.

Same Physical Segment in a nutshell means that it is in the same IP range as your host, so if your IP address is 192.168.10.100 with a subnet mask of 255.255.255.0 then in order to be in the same physical segment your router would need to have an address of 192.168.10.X.
This could get really in depth if we start explaining subnets etc., but in short form when a subnet mask is 255.255.255.0 it means that any device that wants to communicate with it must have an IP address that matches the first 3 sets of numbers. A subnet mask of 255.255.0.0 means that it only has to match the first 2 sets of numbers (in this example 192.168.X.X) and 255.0.0.0 only needs to be in the 192.X.X.X range.
Hope this helps

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Question by splice: How does a host know the IP of the router (remote gateway) if it is connected to a switch before the router?

Best answer:

Answer by Link H
Tthe host is always provided with the IP address of the router/gateway in its internet configuration. The address can be provided as part of the IP configuration that the host receives from a DHCP server.

By the way, switches do not have IP addresses of their own, and do not use them. The switch learns the MAC address of the device connected to each of its ports.

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