The most confusing thing to me is the number of deployment options available for Clean Access. I have a flat network with wireless and VPN users with fewer than 100 hosts. What is the best deployment option and do I have to reconfigure my network. The in-band VG option seems appropriate but I am not sure. Should I create L2 vlans?
Even though your network is considered small network, you could also deploy CCA in out-of-band mode.
But to choose between in-band and out-of-band, you need to look at the way your network is being designed (simple/complex), LAN switches capabilities, bandwidth/traffic volume and access flow & control and few other factors.
But in a flat & small network with mixture of users, including wireless and VPN users, the design/topology should be less complex/simple. I would say the in-band mode is more suitable.
This is based on few factors like smaller amount of traffic that need to always pass through the CCA inspection, availability of 1 vlan and easy to centralize (fewer) CCA in the network.
Out-of-band is more suitable for medium to large network due to combination of large traffic volume, complexity, routing and L2/L3 design as well as how frequent the traffic need to be inspected plus no of available CCA & its volume capacity.
So really, I can have a single VLAN with the CAM and CAS on the same network. Here is my design as an example. The CAM will be 172.16.100.211/16. My gateway is 172.16.100.1/16. The CAS is running in-band VG mode and has the same IP address 172.16.100.212/16 on both the trusted and untrusted. So if this will work, what exactly defines the untrusted network. If I plug a PC in and get an IP address on the 172.16.0.0/16 network, what makes me untrusted. How does that work? Is it done through ACLs against my IP address?
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