CCNA Routing and Switching Complete Study Guide by Todd Lammle

Author:Todd Lammle
Language: eng
Format: epub, pdf
ISBN: 9781119288299
Publisher: Wiley
Published: 2016-09-12T00:00:00+00:00

The any command is pretty obvious—any source address matches the statement, so every packet compared against this line will match. The host command is relatively simple too, as you can see here:

Corp(config)#access-list 10 deny host ? Hostname or A.B.C.D Host address Corp(config)#access-list 10 deny host 172.16.30.2

This tells the list to deny any packets from host 172.16.30.2. The default parameter is host. In other words, if you type access-list 10 deny 172.16.30.2, the router assumes you mean host 172.16.30.2 and that’s exactly how it will show in your running-config.

But there’s another way to specify either a particular host or a range of hosts, and it’s known as wildcard masking. In fact, to specify any range of hosts, you must use wildcard masking in the access list.

So exactly what is wildcard masking? Coming up, I’m going to show you using a standard access list example. I’ll also guide you through how to control access to a virtual terminal.

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