tcp/ip iot public key security ethernet arp routing networks network osi network layer 5g hard skill soft skills industry 4.0 smart network internet gratuitous arp hub switch arp poisoning cracker rainbow table salting password keyloggers guessing mac digital signatures ca crl certificates pki 3des des aes asymmetric cryptography symmetric cryptography private key rsa ciphertext plaintext cryptography chosen plaintext ciphertext-only attack hacking access control cia 10 gigabit ethernet lan fast ethernet gigabit ethernet virtual circuits packet switching circuit switching datagram packet switching semantics standards syntax protocols supernetting ipv4 address subnetting ipv4 ospf rip bgp icmp vlans protocol application layer ipv6
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