Configure troubleshoot Cisco router, switch top to bottom

I can configure Cisco router and switch

1. User Management using Cisco default system and Tacacs+
2. NAT, PAT
3. Sub netting [IPV4, IPV6]
4. VTP,
5. VLANs management
6. STP, PVST, RSTP, MSTP,
7. DHCP Snooping, ARP poisoning, Port Security.
8. Ether channel
9. HSRP, VRRP, GLBP
10. Routing Rip, EIGRP, OSPF, BGP {​​eBGP, iBGP}​​,
11. MPLS.
12. Backup system.
13. IOS installation
14. IPsec VPN, SSL VPN, PPTP VPN
15. IP SLA
16. ACL [Standard, Extend, Time based]