First round is HR Round where HR will ask your information and test your communication skills.
Post that you will be required to give English communication and writing test. Basic level, if you are good with typing and have good communication skills, it should be easy.
Post that technical interview roundss, Understanding of Networking, DNS, OSI Later, Active Directory Forests, Domains,Trusts,DHCP process , TCP 3 way handshake, etc.
Ask for questionnaires or technical topic from HR for preparation and develop understanding of each topics.
Make use of YouTube Video on technical topics, read online documentation.
Important is good understanding of those topic related to the field you're applying for and good communication and customer handling skills.