Ccna routing and Switching Complete Study Guide

1.

  Check the cables because there might be a faulty cable or interface. Verify interface 

 statistics.

2.

  Make sure that devices are determining the correct path from the source to the destina-

tion. Manipulate the routing information if needed.

3.

  Verify that the default gateway is correct.

4.

  Verify that name resolution settings are correct, and especially for IPv6, make sure the 

DNS server is reachable via IPv4 and IPv6.

5.

  Verify that there are no ACLs that are blocking traffic.

In order to troubleshoot this problem, we’ll use the same process of elimination, beginning 

with PC1. We must verify that it’s configured correctly and that IP is working properly. Let’s 

start by pinging the loopback address to verify the IPv6 stack:

C:\Users\Todd Lammle>

ping ::1

 

Pinging ::1 with 32 bytes of data:

Reply from ::1: time<1ms

Reply from ::1: time<1ms

Reply from ::1: time<1ms

Reply from ::1: time<1ms

Well, the IPv6 stack checks out, so let’s ping the Fa0/0 of R1, which PC1 is directly con-

nected to on the same LAN, starting with the link-local address:

C:\Users\Todd Lammle>