Sunday, December 15, 2019

Cisco Troubleshooting Methodology & Bread





Common tools on the router
  1. Ping - tests bidirectional connectivity
  2. Traceroute - uses the ICMP to each hop and maps the route
  3. Telenet - used to indicated if a service is running at the recipient: telenet cisco.com 53 (53 is the port number for DNS; 80 is HTTP; 443 is HTTPS…..)
  4. (PC) nslookup for DNS info - ex \nslookup www.cisco.com

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