You can still install and use them:
yum install network-scripts
Als there an answer on stackexchange on how it's working now and that you can still use network-scripts.
iptables -v -L FORWARD
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 ACCEPT all -- any any anywhere anywhere ctstate RELATED,ESTABLISHED
0 0 ACCEPT all -- lo any anywhere anywhere
0 0 FORWARD_direct all -- any any anywhere anywhere
0 0 FORWARD_IN_ZONES_SOURCE all -- any any anywhere anywhere
0 0 FORWARD_IN_ZONES all -- any any anywhere anywhere
0 0 FORWARD_OUT_ZONES_SOURCE all -- any any anywhere anywhere
0 0 FORWARD_OUT_ZONES all -- any any anywhere anywhere
0 0 DROP all -- any any anywhere anywhere ctstate INVALID
0 0 REJECT all -- any any anywhere anywhere reject-with icmp-host-prohibited
iptables -v -L OUTPUT
Chain OUTPUT (policy ACCEPT 322 packets, 150K bytes)
pkts bytes target prot opt in out source destination
1836 13M ACCEPT all -- any lo anywhere anywhere
322 150K OUTPUT_direct all -- any any anywhere anywhere
iptables -v -L INPUT
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
36813 146M ACCEPT all -- any any anywhere anywhere ctstate RELATED,ESTABLISHED
425 25500 ACCEPT all -- lo any anywhere anywhere
792 52738 INPUT_direct all -- any any anywhere anywhere
792 52738 INPUT_ZONES_SOURCE all -- any any anywhere anywhere
792 52738 INPUT_ZONES all -- any any anywhere anywhere
0 0 DROP all -- any any anywhere anywhere ctstate INVALID
0 0 REJECT all -- any any anywhere anywhere reject-with icmp-host-prohibited