A Network Engineer specializing in Cisco and Juniper is responsible for designing, implementing, managing, and troubleshooting network infrastructure using Cisco and Juniper technologies. They configure routers, switches, firewalls, and other networking devices to ensure secure and efficient data communication. Their role includes monitoring network performance, optimizing configurations, and troubleshooting connectivity issues. They often work with protocols like BGP, OSPF, and VLANs to maintain network stability. Certification in Cisco (CCNA, CCNP) or Juniper (JNCIA, JNCIP) is often preferred for this role.