Assume a network that uses the private IP space 192.168.10.0/24. NAT is being pe

Question

Assume a network that uses the private IP space 192.168.10.0/24. NAT is being performed and the network has connectivity to the Internet. Assume the perimeter frewall has the following state table (note: this table is used for multiple test questions): Source Address Source Port Destination Address Destination Port Connection State 192.168.10.2 50192 192.168.10.131 49511 31.75.35.3 192.168.10.140 61887 192.168.10.141 58239 54.121.219.8 192.168.10.145 52705 192.168.10.150 64239 192.168.10.152 55002 83.19 41.193.47.250 51487 142.153.70.183 49881 192.168.10.3 184.4.12.112 58255 105.60.54.32 123 80 443 443 443 443 Established Established Established Established Established Established Established Established Established Established 54.121.219.8 54.121.219.8 97.114.165.45 2.243.15 192.168.10.3 192.168.10.10 443 What is the host 192.168.10.2 most likely doing? Accessing an unsecured web site on the outside Accessing a GPS time source on the outside Accessing a secure web site on the outside O Being accessed by host 105.60.54.32

Explanation / Answer

The IP address 192.168.10.2 is on Port 123.

Port 123 is used for time synchronization form NTP(Network time Protocol ) server that is being used for GPS time synchronization.

hence Option B( Accessing a GPS time source on the outside) is correct.

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Kindly Check and Verify Thanks..!!!

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