network security

[j-hammond]

i am quite neww to this,i have a network connected to a fibre optic back bone connected to other buildings.i want to put a cisco switch/router between my fibre node and my switch to prevent intrusion and dhcp request from other nodes.i have 300 computers on my network.any idea which particular cisco device to use?

[JORGE RODRIGUEZ]

let me understand, your site of 300 computers connects to a already trusted network via fiber to the backbone CORE network, and you want to implement intrution prevention as well as block DHCP requests from nodes outside your site.

Whith that amount of users in a single site I would guess it has a router, and the site is segmented with few subnets, and possibly local windows DC with DHCP services, if this is what I think there is not need for placing a device or implement ACLs to block DHCP requests from other nodes because your local subnets are bound to your edge router and DHCP servers at the site .. can you be more specific on how your site is design in relation to the other nodes/sites?

For intrution prevention take a look at IPS solutions.

http://www.cisco.com/en/US/products/sw/secursw/ps2113/index.html

HTH

Jorge