What is exactly creating an alias of interfaces?

[Blason_R]

Hi Team,

Just wondering creating an alias interface means creating a sub-interface in CISCO? Will it carry the traffic for sub-interfaces if so?

e.g. on Bond20 Physical IP is 192.168.10.20/24 and alias created is 10.10.10.20/24. In that case if 192.168.10.x and 10.10.10.x is on same swtich with default vlan will they able to communicate through firewall?