What ICMP message types are used by the ping command?
Answer(s): B
ICMP Type 0 = Echo Reply, ICMP Type 8 = Echo
Which of the following systems would not respond correctly to an nmap XMAS scan?
Answer(s): A
When running a XMAS Scan, if a RST packet is received, the port is considered closed, while no response means it is open|filtered. The big downside is that not all systems follow RFC 793 to the letter. A number of systems send RST responses to the probes regardless of whether the port is open or not. This causes all of the ports to be labeled closed. Major operating systems that do this are Microsoft Windows, many Cisco devices, BSDI, and IBM OS/400.
home/root # traceroute www.targetcorp.com <http://www.targetcorp.com> traceroute to www.targetcorp.com <http://www.targetcorp.com> (192.168.12.18), 64 hops may, 40 byte packets1 router.anon.com (192.13.212.254) 1.373 ms 1.123 ms 1.280 ms2 192.13.133.121 (192.13.133.121) 3.680 ms 3.506 ms 4.583 ms3 firewall.anon.com (192.13.192.17) 127.189 ms 257.404 ms 208.484 ms4 anon-gw.anon.com (192.93.144.89) 471.68 ms 376.875 ms 228.286 ms5 fe5-0.lin.isp.com (192.162.231.225) 2.961 ms 3.852 ms 2.974 ms6 fe0-0.lon0.isp.com (192.162.231.234) 3.979 ms 3.243 ms 4.370 ms7 192.13.133.5 (192.13.133.5) 11.454 ms 4.221 ms 3.333 ms6 * * *7 * * *8 www.targetcorp.com <http://www.targetcorp.com> (192.168.12.18) 5.392ms 3.348 ms 3.199 msUse the traceroute results shown above to answer the following questions: The perimeter security at targetcorp.com does not permit ICMP TTL-expired packets out.
As seen in the exhibit there is 2 registrations with timeout, this tells us that the firewall filters packets where the TTL has reached 0, when you continue with higher starting values for TTL you will get an answer from the target of the traceroute.
While attempting to discover the remote operating system on the target computer, you receive the following results from an nmap scan:Starting nmap V. 3.10ALPHA9 ( www.insecure.org/nmap/<http://www.insecure.org/nmap/> ) Interesting ports on 172.121.12.222:(The 1592 ports scanned but not shown below are in state: filtered) Port State Service21/tcp open ftp 25/tcp open smtp 53/tcp closed domain 80/tcp open http 443/tcp open httpsRemote operating system guess: Too many signatures match to reliably guess the OS.Nmap run completed -- 1 IP address (1 host up) scanned in 277.483 secondsWhat should be your next step to identify the OS?
Answer(s): D
Most people don’t care about changing the banners presented by applications listening to open ports and therefore you should get fairly accurate information when grabbing banners from open ports with, for example, a telnet application.
When Nmap performs a ping sweep, which of the following sets of requests does it send to the target device?
The default behavior of NMAP is to do both an ICMP ping sweep (the usual kind of ping) and a TCP port 80 ACK ping sweep. If an admin is logging this will be fairly characteristic of NMAP.
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