Setup an access list on the router allowing them to communicate in the first place. If that is the 4500 set it up there.

Cisco Access Lists allow businesses to increase system security by defining exactly which devices are allowed to access network resources. Each Access List comprises a series of entries, with each ...

What is the best way to modify a Cisco access-list? I have several where I want to insert entries into them, but in many cases there's not enough space between entries to allow for the old 332, 333, ...

In Cisco LAN switch environments, the native VLAN is typically untagged on 802.1Q trunk ports. This can lead to a security vulnerability in your network environment. It is a best practice to ...