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Systems Administrator varies from lots of different things. Typically you manage all servers/clients on your network. So thinks like server maintenance, OS Imaging, package creation and deployment, group policies, users/groups and LDAP, so on and so forth.
Network Admin is typically the person that sets up and maintains all your networking hardware. Such as: switches, controllers, routers, access points, and so forth. Since networking hardware can also run services like firewalls, DHCP, DNS, and so forth, a Network Admin would take control of that aspect as well.
A system administrator mainly focus on local systems and local area networks and optimization fine turning of Desktop server etc.
On the other hand, a network Administrator more focus on Wild area network
Optimization fine turning of Router and switch like Cisco for their wan connectivity
Infact, you can say he is taking care of your connectivity between branch offices which is in different geographical location.