The required skill set is the following:
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Linux knowledge - RHCSA / LPIC-1 level knowledge
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Comfort with the bash command line
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Basic system administration skills - service manipulation, file(system) management, package management
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Debian/Ubuntu exposure a plus
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Networking knowledge - CCNP level knowledge
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Network fundamentals - IP subnetting, DHCP, DNS, ipv6, ARP, bridging, layer 1 troubleshooting, bonding with LACP
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L2 technologies - VLAN/802.1q trunking concepts, STP, MLAG
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L3 technologies - general routing - BGP, OSPF, route redistribution
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Overlay technologies - notably VxLAN is a plus
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Proven problem solving / technical troubleshooting
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Professional communication fluency in English, both verbal and written