We recently purchased a Cisco switch for our Hadoop cluster. So I wanted to set up the Cisco switch. But first of all, I want to configure ssh and disable telnet. Let's see how we can do that.
Connect to the switch using telnet or using the console port. (You should enable telnet and give a password from express setup.)

enable
configure terminal
hostname <switchname>
ip domain-name <domain name>
crypto key generate rsa

Enter "1024" when it prompts for

How many bits int the modulus [512]:

Then run below commands

interface fa0/0
ip address 192.168.1.1 255.255.255.0
no shutdown
username <username> priv 15 secret <password>
aaa new-model
enable secret <password>

If you have a Cisco router use "0 4" instead of "0 14"

line vty 0 14
transport input ssh
end
copy running-config startup-config

Now you can use SSH client to connect to switch.