Troubleshooting Methodologies and Tools
B1 thu thap dau hieu su co
B2 khoanh vung va co lap
B3 khac phuc su co
Transpot //NAT ACL
Network //ping den router, gateway, xem mang internet co mat khong
Datalink //PPP, Frame Relay
Loi tang 1 //lam hieu nang giam, mat ket noi, CPU tang cao, …