F5 F5CAB1 Dumps

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. tcpdump -i eth0 -n port 443

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. tcpdump -i mgmt -n port 443

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. tcpdump -i 0.0

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

Itdoes NOTcapture management-plane traffic.

D. tcpdump -i tun0

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

Not related to management access.

E. tcpdump -i management

There isnointerface named management on BIG-IP.

The correct names are mgmt or eth0.

BIG-IP licensing information, including theService Check Date, is stored in the file:

/config/bigip.license

This file contains all license attributes downloaded from the F5 licensing server, including:

License key

Licensed modules

Useful life date

Service check date

TheService Check Datedetermines whether the system is eligible for upgrades to specific TMOS versions. When reviewing upgrade readiness, administrators extract this value directly from the license file with:

grep "Service check date" /config/bigip.license

Why the other options are incorrect:

/config/bigip.confstores BIG-IP configuration objects, not license metadata.

/config/svc_chk_date.datisnota valid file in the licensing system; it does not contain license parameters.

/config/BigDB.datstores internal database values, not licensing attributes.

Thus, only thebigip.licensefile contains the correct licensing information required for verifying upgrade eligibility.

Self-IPs include a security feature calledPort Lockdown, which restricts which services respond on that Self-IP.

By default, Self-IPs block management access (SSH and HTTPS/TMUI), meaning an administrator cannot manage the device through in-band Self-IPs unless explicitly allowed.

Allow Mgmt / Allow Management

These settings enable only the management services required for administrative access, specifically:

SSH (22)

HTTPS/TMUI (443)

These options allow secure administration without opening unnecessary ports.

Why these are correct:

They provide only the essential access for management.

They follow F5 security best practices when using in-band admin access.

They donotexpose all services, reducing the attack surface.

Why the other options are incorrect:

A. Allow Default

This allows only a minimal set of system-required ports (e.g., failover, config sync), not SSH or HTTPS.

Administrator access would still fail.

B. Allow All

Opens all ports on the Self-IP, which isnot secure.

Exposes services that should remain restricted.

Therefore,Allow Mgmt / Allow Managementare the correct choices.