Contents
News & Tools
- NSA to Pentagon: Lock Down Your Weapons Before Hackers Get to Them: The U.S. military’s pivot to high-tech enemies means weapons that run on computers are at risk.
- Cyberattack on Toyota’s supply chain shuts its 14 factories in Japan for 24 hours
- Hundreds of companies potentially hit by Okta hack
- LAPSUS$ Hacker Group Arrests; Okta Breached – ThreatWire
Lab-01 Debriefing
Decoding the output from “show ip route”
This is one entry from: show ip route
O 90.125.0.0 [110/74] via 18.1.25.2, 05:29:08, Serial0/0
| O | Routing protocol “OSPF” |
| 90.125.0.0 | Remote network |
| [110 | Administrative Distance (AD) |
| /74] | OSPF cost |
| via 18.1.25.2 | Next hop IP to Forward the packet to the 90.125.0.0 network |
| 05:29:08 | Aging time. How long the protocol has been running |
| Serial0/0 | Interface used to reach the next hop |
Reference:
Router Configuration Checklist
- Identify the interfaces to be used.
- Identify the directly connected networks.
- Determine the network address of each network.
- Configure the IP address and subnet mask on only those interfaces to be used.
- Enable the interface(s) : no shutdown
- Add the routing protocol
- Add only the network address of each “directly connected” interface of specific router.
Cisco IOS Reference
Troubleshooting & Verifying Networks
Diagnostic Commands
Get very familiar with the output from each of these commands.
show ip interface brief
show ip route
show ip protocol
show ip ospf neighbor {If you’re using OSPF}
show controllers s0/0 or s0/1 {Determine if the serial interface is DCE or DTE}
show ip dhcp binding {If the router is configured as a DHCP server}
show running-config {Make sure to press the space bar to show additional pages if the CLI says “–More–”}
show ip arp
Hands-on Lab-02
- Network Simulation Configuration
- Configuring Network Interfaces
- Troubleshooting Commands
- You must be in class this day to get credit for completing this lab.
- When saving, always increment the version number at the end of the filename every time you save. And, save often.
- Starting Filename: CST3607 Lab-02 <YourLastName>, <YourFirstName> v01
Read / Watch / Do
CCNA Certification Study Guide, Volume 2
- Read Chapter 8 : VLANs and Inter-VLAN Routing
- Do the Written Labs
- Answer the Review Questions
- Do not submit your answers to Review Questions. The answers are in the Appendix.