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Question 35

A new VLAN vlan301 has been configured on a highly available LTM device in partition ApplicationA. A new directly connected backend server has been placed on vlan301. However, there are connectivity issues pinging the default gateway. The VLAN self IPs configured on the LTM devices are 192.168.0.251 and

192.168.0.252 with floating IP 192.168.0.253. The LTM Specialist needs to perform a packet capture to assist with troubleshooting the connectivity.

Which command should the LTM Specialist execute on the LTM device command line interface to capture the attempted pings to the LTM device default gateway on VLAN vlan301?

    Correct Answer: A

    The correct command for capturing the attempted pings to the LTM device default gateway on VLAN vlan301 involves capturing packets associated with the floating IP, since this is typically used as the default gateway in a high availability setup. The command needs the appropriate partition and VLAN specified. The correct command is 'tcpdump -ni /ApplicationA/vlan301 'host 192.168.0.253''. This ensures that packets directed to the floating IP within the specified VLAN are captured.

Discussion
lbys

why not 192.168.0.252 or 192.168.0.251

techbot

192.168.0.253 is the floating IP and is configured specifically for the purpose of being used as the next-hop or default-gateway for servers in a HA set up. So from a server in the VLAN301, regardless of which LTM device is active, 192.168.0.253 would always be reachable.