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An access switch is a switch that almost always only runs Layer 2 or Ethernet, it does not router packers only forwards frames. An access switch may only have end user computers attached and a connection (or multiple connections using LACP) to the core switch.You may also have servers connected to theaccess switch, but this may or may not be a good idea.n access switch may only have end user computers attached and a connection (or multiple connections using LACP) to the core switch. You may also have servers connected to theaccess switch, but this may or may not be a good idea.
Trunk links are required to pass VLAN information between switches. A port on a Cisco switch is either an access port or a trunk port. Access ports belong to a single VLAN and do not provide any identifying marks on the frames that are passed between switches.Access ports also carry traffic that comes from only the VLAN assigned to the port.. The most basic way to configure a trunk link is using the option on. This option enables the trunk and requires that you also specify a tagging mechanism for the trunk. For IOS devices, the command switchport mode trunk is equivalent to the set trunk mod/port on command.