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I have some questions about a switch setup at one of our clients. (Studying for CCNA)<br />
Partial running config is below. <br />
<br />
Questions:<br />
What is &quot;no aaa new-model&quot;?<br />
<br />
What is &quot;system mtu routing 1500&quot;? (It is passing VLAN information, does his have to be set to prevent baby giants? )<br />
<br />
&quot;IP routing&quot; Does this indicate a layer 3 switch?<br />
<br />
What's the crypto pki trustpoint setup?<br />
<br />
Thanks!<br />

<pre><code id="code-353790">username admin privilege 15 password 0 ******
no aaa new-model
system mtu routing 1500
ip subnet-zero
ip routing
!
!
!
crypto pki trustpoint TP-self-signed-206236160
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-206236160
 revocation-check none
 rsakeypair TP-self-signed-206236160
!
!
crypto pki certificate chain TP-self-signed-206236160
 certificate self-signed 01
</code></pre>
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I have some questions about a switch setup at one of our clients. (Studying for CCNA)
Partial running config is below. 

Questions:
What is "no aaa new-model"?

What is "system mtu routing 1500"? (It is passing VLAN information, does his have to be set to prevent baby giants? )

"IP routing" Does this indicate a layer 3 switch?

What's the crypto pki trustpoint setup?

Thanks!

Switch Questions!

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.