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201 · Question #256

A VLAN has the following objects configured: Self-IP 10.10.10.100 with port lockdown set to Allow default Virtual server 10.10.10.100:443 with UDP profile enabled Virtual server 10.10.10.0/24 port for

The correct answer is A. self-IP 10.10.10.100 with port lockdown set to Allow default. When HTTPS traffic (TCP 443) targets a self-IP address directly, and no standard TCP virtual server exists for that IP and port, the self-IP's port lockdown settings determine if the traffic is processed or dropped.

Section 2: Configure Load Balancing Features

Question

A VLAN has the following objects configured:

Self-IP 10.10.10.100 with port lockdown set to Allow default Virtual server 10.10.10.100:443 with UDP profile enabled Virtual server 10.10.10.0/24 port forwarding virtual server Global destination NAT forwarding 10.10.10.100 to internal server 172.168.10.100 Which object will process this request when https://10.10.10.100 is entered into a browser?

Options

  • Aself-IP 10.10.10.100 with port lockdown set to Allow default
  • Bvirtual server 10.10.100/24 port o forwarding virtual server
  • Cglobal destination NAT forwarding 10.10.10.100 to internal server 172.168.10.100
  • Dvirtual server 10.10.10.100.443 with UDP profile enabled

How the community answered

(30 responses)
  • A
    70% (21)
  • B
    10% (3)
  • C
    3% (1)
  • D
    17% (5)

Why each option

When HTTPS traffic (TCP 443) targets a self-IP address directly, and no standard TCP virtual server exists for that IP and port, the self-IP's port lockdown settings determine if the traffic is processed or dropped.

Aself-IP 10.10.10.100 with port lockdown set to Allow defaultCorrect

The request https://10.10.10.100 targets the self-IP address on port 443 (HTTPS). Since the virtual server 10.10.10.100:443 is configured with a UDP profile, it will not process TCP traffic. Therefore, the self-IP address's port lockdown setting of Allow Default will allow the TCP 443 connection to the BIG-IP management plane, causing the self-IP to process the request.

Bvirtual server 10.10.100/24 port o forwarding virtual server

A virtual server with 10.10.10.0/24 as its destination is a network-based forwarding virtual server and would not specifically match a host address like 10.10.10.100 on port 443.

Cglobal destination NAT forwarding 10.10.10.100 to internal server 172.168.10.100

Global destination NAT forwarding applies to specific IP addresses and ports, but virtual servers take precedence for matching traffic, and this is less specific without a port.

Dvirtual server 10.10.10.100.443 with UDP profile enabled

The virtual server 10.10.10.100:443 is configured with a UDP profile, meaning it will only process UDP traffic, not the TCP-based HTTPS traffic from a browser.

Concept tested: BIG-IP traffic processing order, self-IP port lockdown

Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-system-management/configuring-network-settings-for-self-ips.html

Topics

#Self-IP#Virtual server#Packet flow#Port lockdown#Precedence

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