An nmap command that includes the host specification of 202.176.56-57.* will scan____ number of hosts.
Answer(s): C
The hosts with IP address 202.176.56.0-255 & 202.176.56.0-255 will be scanned (256+256=512)
A specific site received 91 ICMP_ECHO packets within 90 minutes from 47 different sites.77 of the ICMP_ECHO packets had an ICMP ID:39612 and Seq:57072. 13 of the ICMP_ECHO packets had an ICMP ID:0 and Seq:0. What can you infer from this information?
Answer(s): B
Which of the following commands runs snort in packet logger mode?
Note: If you want to store the packages in binary mode for later analysis use./snort-l./log -b
Which of the following command line switch would you use for OS detection in Nmap?
OS DETECTION: -O: Enable OS detection (try 2nd generation w/fallback to 1st) - O2: Only use the new OS detection system (no fallback) -O1: Only use the old (1st generation) OS detection system --osscan-limit: Limit OS detection to promising targets --osscan-guess: Guess OS more aggressively
You ping a target IP to check if the host is up. You do not get a response. You suspect ICMP is blocked at the firewall. Next you use hping2 tool to ping the target host and you get a response. Why does the host respond to hping2 and not ping packet?[ceh]# ping 10.2.3.4PING 10.2.3.4 (10.2.3.4) from 10.2.3.80 : 56(84) bytes of data.--- 10.2.3.4 ping statistics ---3 packets transmitted, 0 packets received, 100% packet loss[ceh]# ./hping2 -c 4 -n -i 2 10.2.3.4HPING 10.2.3.4 (eth0 10.2.3.4): NO FLAGS are set, 40 headers + 0 data bytes len=46 ip=10.2.3.4 flags=RA seq=0 ttl=128 id=54167 win=0 rtt=0.8 ms len=46 ip=10.2.3.4 flags=RA seq=1 ttl=128 id=54935 win=0 rtt=0.7 ms len=46 ip=10.2.3.4 flags=RA seq=2 ttl=128 id=55447 win=0 rtt=0.7 ms len=46 ip=10.2.3.4 flags=RA seq=3 ttl=128 id=55959 win=0 rtt=0.7 ms--- 10.2.3.4 hping statistic ---4 packets tramitted, 4 packets received, 0% packet loss round-trip min/avg/max = 0.7/0.8/0.8 ms
Default protocol is TCP, by default hping2 will send tcp headers to target host's port 0 with a winsize of 64 without any tcp flag on. Often this is the best way to do an 'hide ping', useful when target is behind a firewall that drop ICMP. Moreover a tcp null-flag to port 0 has a good probability of not being logged.
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