Troubleshooting Serial Lines - Cisco Systems
Solved: Serial0/1/1, changed state to down When use the encapsulation PPP - Cisco Community
networking - Line protocol on Interface GigabitEthernet1/0/1, changed state to down - Server Fault
Solved: FastEthernet is down, line protocol is down (disabled) - Cisco Community
Unable to connect between Router and PC with crossover cable in Cisco Packet Tracer Student - Stack Overflow
Interface status codes
Solved: Router interface protocol is down - Cisco Community
Cisco CCNA Configuring Router Interfaces
![Troubleshooting Layer 2 Problems - Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide [Book]](https://www.oreilly.com/api/v2/epubs/9780133363289/files/graphics/12tab06.jpg "Troubleshooting Layer 2 Problems - Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide [Book]")
Troubleshooting Layer 2 Problems - Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide [Book]
Troubleshooting Serial Line Problems - Cisco
Troubleshooting Serial Lines - Cisco Systems
Troubleshooting Serial Lines - Cisco Systems
Solved: Status UP , Protocol DOWN - 2811 Router on Cisco Packet Tracer - Cisco Community
Ciscoルータ - show interfacesの見方
Cisco CCNA Configuring Router Interfaces
Troubleshooting Serial Lines - Cisco Systems
Q.101571: What does the Serial 0 is administratively do
![SOLVED] VLAN Status up, protocol down? - Networking](https://content.spiceworksstatic.com/service.community/p/post_images/0000067397/54d1700d/attached_image/ScreenShot456.png "SOLVED] VLAN Status up, protocol down? - Networking")
SOLVED] VLAN Status up, protocol down? - Networking
Cisco - Hot Standby Router Protocol (HSRP): Frequently Asked ...
T1 Line Protocol Down - Cisco Community
