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(ISC)2

301B · Question #26

301B Question #26: Real Exam Question with Answer & Explanation

The correct answer is B. Loose Initiation. See the full explanation below for the reasoning.

Question

An LTM device has a virtual server configured as a Performance Layer 4 virtual listening on 0.0.0.0:0 to perform routing of packets to an upstream router. The client machine at IP address 192.168.0.4 is attempting to contact a host upstream of the LTM device on IP address 10.0.0.99. The network flow is asymmetrical, and the following TCP capture displays:

tcpdump -nnni 0.0 'host 192.168.0.4 and host 10.0.0.99' tcpdump:

verbose output suppressed, use -v or -vvv for full protocol decode listening on 0.0, link-type EN10MB (Ethernet), capture size 96 bytes 05:07:55.499893 IP 192.168.0.4.35345 > 10.0.0.99.443: S 05:07:55.499893 IP 10.0.0.99.443 > 192.168.0.4.35345: R 1:1(0) ack 1 win 0 05:07:56.499960 IP 192.168.0.4.35345 > 10.0.0.99.443: S 05:07:56.5656213:0(0) ack 3267995082 win 1480 05:07:56.499990 IP 10.0.0.99.443 > 192.168.0.4.35345: R 1:1(0) ack 1 win 0 4 packets captured Which option within the fastL4 profile needs to be enabled by the LTM Specialist to prevent the LTM device from rejecting the flow?

Options

  • ALoose Close
  • BLoose Initiation
  • CReset on Timeout
  • DGenerate Initial Sequence Number

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