Yes, You will need one serial cable and Ethernet cable to login to the CBU. If you know the IP address of the node.
On the CBU there are two ports:
Ethernet and Test. If you have the right set of cables to connect. Just change the IP address of your lap top one higher than the node’s ip address. Then, use the element manager and put the ip address in it and try connect. You will be able to log into the node.