DNS:

• it keeps track of all hostnames and ip’s

• it convert host to ip address and ip to host vice versa.

Firewall:

Which stops anauthorized access to the network i.e Allow or Deny

Load Balancer:

Which destribute the traffic evenly across the multiple servers.

Protocals:

1. Http-80

2. Https-443

3. ssh - 22 for linux

RDP-3389 for windows

SOA:

Sort of authority it has ip

Data is transfor in the form of pockets.