• AAA protocols
• Broadband solution
• DHCP OPTION 43 Configuration Example
• HOW TO CLEAR THE LOCAL DNS CACHE
• Carrier Ethernet and MPLS
• Dynamic routing
• DHCP
• Cisco, HuaWei, h3c command mapping table
• Datalink layer
• digital transmission
• Directed broadcast address and Local broadcast address
• Java connection issue for port less than 1024
• Ethernet
• FTP commands
• Frame Relay
• IP address
• netstat command
• HDLC and PPP
• Proxy ARP
• IPv4 vs IPv6
• Inter-VLAN routing
• Internet connection issue troubleshooting steps
• How to prevent your email from been marked as spam
• Medium access control(Collision detect)
• nslookup
• TCP：三次握手、四次握手、backlog及其他
• MTU MSU
• Manchester Coding Basic
• Metric prefix
• Network Layer
• 运维工程师
• Port forwarding or Port mapping
• Point to Point Connections basic
• Physical layer
• Routing basic
• Routing table
• Router
• Routing table and topology table in EIGRP or OSPF
• Standard orgnizations
• Route command
• SNMP protocol
• Static routing
• Single area OSPF
• Transport Layer
• TCP functional Specification
• Troubleshoot PPP
• Secure Site-to-site connection ( VPN,GRE,IPsec)
  • IPsec (CCNA)
• Troubleshooting Network
• DHCP UDP Ports 67 and 68
• VLAN
• Wireless network
• WAN technologies Layer 1 technologies
• WAN technologies Layer 2 technologies