====== Various ======

These items will probably get their own pages at one point.

===== WAN - Serial =====
----
Uses V.35 connector!

===== Switching =====
----
==== Range / Port Sec ====
----
Good things to know:
  * Work on blocks of ranges with a comma separator:
  *<code>Switch(config)#interface range fastEthernet 0/1-5, fastEthernet 0/10-15</code>
  * Clear port-sec macs? Supposedly removes ERR DISABLED states as mentioned in a Crouthamel video. Test this:
  * <code>Switch#clear port-security all</code>

  * **Violation Modes:**
    * **Shutdown:**
      *  Shutdown the port to ERR DISABLED on violation.
    * **Protect:**
      * Ignore MAC traffic not configured in port-sec.
      * AKA don't count 3rd machine's traffic if only a max of 2 addresses on the port.
    * **Restrict:**
      * Same as protect but throws a message to the console.

==== Switchport Modes ====
----
Default switchport mode appears to be dynamic auto.

  * //**Dynamic:**//
    * Auto: Will comply with trunk requests
    * Desirable: Will comply AND initiate trunk requests.
  * //**Trunk**//: Will act as trunk.
  * //**Access**//: Will act as access (no trunking).

==== Speed / Duplex ====
----
Speed and Duplex are auto-negotiated by default. These commands also work on routers.
Manually configure them with:

<code>
Switch(config-if)#speed ?
  10    Force 10 Mbps operation
  100   Force 100 Mbps operation
  auto  Enable AUTO speed configuration
  
Switch(config-if)#duplex ?
  auto  Enable AUTO duplex configuration
  full  Force full duplex operation
  half  Force half-duplex operation
</code>

Re-enable auto-negotiation by removing the configured speed/duplex:
<code>
Switch(config-if)#no duplex
Switch(config-if)#no speed
</code>

==== Useful Commands ====
----
I'll update these as I come across them.

<code>
SW1# show interfaces description
SW1# show interfaces switchport
SW1# show interfaces status
SW1# show port-security interface fa0/1
</code>


===== OSI Model =====
----
Open Systems Interconnection model, 7 layers.

  * "All people seem to need data processing." -- Top to bottom
  * "Please do not throw sausage pizza away." -- Bottom to top.

  * Application
  * Presentation
  * Session
  * Transport
  * Network
  * Data-link
  * Physical