F5CAB1 Practice Questions

The BIG-IP has two distinct planes:

Management-plane→ handled entirely by the management interface (MGMT)

Data-plane (TMM)→ handles Self IPs, VLAN interfaces, and traffic processing

To capture traffic on the management interface, only the management-side NICs may be used:

mgmt→ Logical name for the management interface

eth0→ Physical Linux interface mapped to the management port on most BIG-IP platforms

Both of these correctly capture inbound/outbound WebUI (HTTPS/443) traffic on the management port.

Why the correct answers are A and B

A.  

On BIG-IP appliances and VMs, the management port maps toeth0at the Linux OS level.

Capturing on eth0 correctly shows HTTPS traffic to the WebUI.

B.  

mgmtis the BIG-IP alias for the management interface.

This is thepreferredand most explicit capture interface for management-plane packet captures.

Why the other options are incorrect:

C.  

Interface0.0is the TMM switch interface used for data-plane packet captures.

Itdoes NOTcapture management-plane traffic.

D.  

Used for tunnel interfaces (IPsec, VXLAN, etc.)

Not related to management access.

E.  

There isnointerface named management on BIG-IP.

The correct names are mgmt or eth0.