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101 · Question #95
101 Question #95: Real Exam Question with Answer & Explanation
The correct answer is A: Destination IP: 10.10.2.10. When destination IP 10.10.2.10 matches only the IP Forwarding virtual server VirtualServer3 (10.10.2.0/24:80), BIG-IP passes the packet through unchanged, preserving the original destination IP.
Question
An LTM has the 3 virtual servers, a SNAT, four self IP addresses defined and the networks shown in the exhibit. Selected options for each object are shown below. Settings not shown are at their defaults. VirtualServerl Destination: 10.10.2.102:80 netmask 255.255.255.255 Pool: Pool with 3 members in the 172.16/16 network VirtualServer2 Destination: 10.10.2.102:* netmask 255.255.255.255 Pool: Pool with 3 members in the 192.168/16 network VirtualServer3 Destination: 10.10.2.0:80 netmask 255.255.255.0 Type: IP Forwarding SNAT1 Source IP: All Addresses SNATAddress: SNAT Pool with 2 members 172.16.20.50 and 192.168.10.50 Self IPs 192.168.1.1; 172.16.1.1; 10.10.2.1; 10.10.1.1 A connection attempt is made with a source IP and port of 10.20.100.50:2222 and a destination IP and port of 10.10.2.10:80. When the request is processed, what will be the destination IP address?
Options
- ADestination IP: 10.10.2.10
- BDestination IP: pool member in the 192.168/16 network.
- CDestination IP: pool member in the 172.16/16 network
- DThe request will be dropped.
Explanation
When destination IP 10.10.2.10 matches only the IP Forwarding virtual server VirtualServer3 (10.10.2.0/24:80), BIG-IP passes the packet through unchanged, preserving the original destination IP.
Common mistakes.
- B. VirtualServer2 (10.10.2.102:*) requires the exact IP 10.10.2.102 and does not match destination 10.10.2.10, so its 192.168/16 pool is never selected.
- C. VirtualServer1 (10.10.2.102:80) also requires the exact IP 10.10.2.102 and does not match destination 10.10.2.10, so its 172.16/16 pool is never selected.
- D. The packet is not dropped because VirtualServer3 (10.10.2.0/24:80) does match 10.10.2.10:80 and forwards it as an IP Forwarding virtual server without modification.
Concept tested. BIG-IP LTM IP Forwarding virtual server behavior
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