You can see these common ports in the /etc/services file and online at
http://www.iana.org/assignments/port-numbers.
As a system administrator, you can assign ports on your server to different applications.
You can do so by editing the server??™s configuration file. This can occasionally thwart
remote attacks on a common port, but it requires you to notify your legitimate remote
users to connect to the new port instead of the common port.
Network Organization
The bigger your network gets, the more problematic the organization of your addressing
becomes. If you have fewer than 254 devices needing an IP address, you??™re pretty much
home free with a Class C network. But after that, it can get interesting. There are some
workarounds, though, which is what this section is about.
Subnetting
Class A and B networks can include separate networks called subnets. These subnets are
specified in the second octet (in Class A networks) or in the third octet (in Class B
networks). One computer with an address of 172.19.25.0 and another of 172.19.120.5
would be on the same Class B network (172.
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