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Network Fundamentals

Lesson 7: Recognize common protocol port values (such as, SSH, Telnet, HTTP, HTTPS, and NETCONF)

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Network Fundamentals Lesson 6: Describe the functionality of these IP Services: DHCP, DNS, NAT, SNMP, NTP
Network Fundamentals Lesson 8: Identify cause of application connectivity issues (NAT problem, Transport Port blocked, proxy, and VPN)