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CEH Video Questions
questions to remember from videos
58
Computer Science
Professional
05/07/2012

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Term
what is Passive information gathering in footprinting?
Definition
collecting info from target publicly - staying off radar
Term
what is active information gathering in footprinting?
Definition
gather info from social engineering and on-site visits, interviews, calls, telnet banner grabbing.
Term
tcp push?
Definition
instructs sending system to send all buffered data now.
Term
tcp urg?
Definition
states this data packet should be processed asap.
Term
tcp fin?
Definition
tells system there will be no more transmissions.
Term
tcp rst?
Definition
used to reset the connection.
Term
tcp ack?
Definition
used to acknowledge the receipt of a packet.
Term
tcp syn?
Definition
used to initiate a connection between two hosts. session setup only.
Term
hping3 -1 10.0.0.25
Definition
normal ICMP Ping
Term
hping3 -F -P -U 10.0.0.25 -p 80
Definition
FIN, PUSH and URG scan on port 80
Term
hping3 -1 10.0.1.x --rand-dest -I eth0
Definition
scan entire subnet for live host
Term
hping3 -2 10.0.0.25 -p 80
Definition
UDP scan on port 80
Term
hping3 -A 10.0.0.25 -p 80
Definition
ACK scan on port 80
Term
hping3 -8 50-56 -S 10.0.0.25 -V
Definition
SYN scan on ports 50-56
Term
you send a SYN packet to a host to determine if it's alive. It responds with an RST. Why?
Definition
port is closed.
Term
you send a SYN packet to a server. It responds with SYN/ACK. Why?
Definition
port is open.
Term
URG, ACK, RST, SYN, FIN flags set on the TCP packet. What type of scan is this?
Definition
Xmas scan.
Term
you send an Xmas packet to a Unix box. You get nothing back. Why?
Definition
port is open. it doesn't respond to xmas if port is open.
Term
you send an Xmas packet to a Unix box. You get an RST. Why?
Definition
port is closed.
Term
you send an Xmas packet to a Windows box. You get an RST. Why?
Definition
Xmas packets don't work with Windows. They will always send an RST packet either for open or closed ports.
Term
Is the FIN scan the same as Xmas scans in regards to responses from Unix or Windows boxes?
Definition
Yes.
Term
What are the three inverse scans?
Definition
FIN, Xmas, NULL
Term
You send an inverse scan to a Unix box. No response. Why?
Definition
Open port.
Term
Do inverse scans work with Windows boxes for determining if ports are open? (FIN, Xmas, NULL)
Definition
No.
Term
In a NULL scan, which flags are set?
Definition
None.
Term
in an IDLE scan, what are you probing the zombie for?
Definition
IPID.
Term
In an IDLE scan, once you have the zombie's IPID and send a SYN packet using his IP to the target server for probing a port, you find his IPID has incremented by 2. What does this mean?
Definition
port was open.
Term
In an IDLE scan, once you have the zombie's IPID and send a SYN packet using his IP to the target server for probing a port, you find his IPID has incremented by 1. What does this mean?
Definition
port was closed.
Term
A list scan generates a list of IP/Names and then does what query?
Definition
DNS name resolution.
Term
in a UDP scan, if the port is open what will you receive?
Definition
nothing.
Term
in a UDP scan, what you receive if the port is closed?
Definition
ICMP port unreachable message.
Term
Generally if probing a Unix box for open ports receiving a RST/ACK means?
Definition
port is open.
Term
Generally if probing a Unix box for open ports receiving no response means?
Definition
port is closed.
Term
What does IIS Lockdown Tool do?
Definition
disables or changes the server banner in Microsoft's IIS product.
Term
Nessus is what type of scanner for the windows environment?
Definition
vulnerability
Term
SAINT/SATAN/SARA is what type of scanning tool for the Unix environment?
Definition
vulnerability
Term
GFI Languard/Nessus/Core Impact/MBSA is what type of scanner?
Definition
vulnerability
Term
LANsurveyor/IPsonar/CartoReso/NetMapper does what?
Definition
draws a network diagram based on the topology.
Term
what is the process of extracting data such as user names, machine names, network resources, shares, services, banners?
Definition
enumeration
Term
What is this command doing? "ls -d ebay.com"
Definition
zone transfer
Term
nslookup and Men & Mice suite perform what type of enumeration?
Definition
DNS
Term
superscan, netbios enumerator, pstools suite perform what type of enumeration?
Definition
netBIOS
Term
NULL sessions use which two ports?
Definition
139, 445
Term
SNMPUtil and SNScan can do what over the network?
Definition
SNMP inquiries.
Term
What does the sid2user program do?
Definition
takes the 500 user account SID and outputs the username associated with it.
Term
Would creating a NULL session allow a hacker to enumerate users and shares on a network?
Definition
yes
Term
netBIOS ports? (3)
Definition
135,139,445
Term
You ACK scan a host. You receive an RST. Is the port open or closed?
Definition
open.
Term
How to determine an LM hash if the password is less than 8 chars?
Definition
rightmost portion ends in "4EE"
Term
You ACK scan a host. You receive an RST. Is the port open or closed?
Definition
closed.
Term
What is the Microsoft SID for the admin?
Definition
500
Term
What is the Microsoft SID for the guest?
Definition
501
Term
the tool macof performs which utility?
Definition
port to mac address table (CAM table) overflow on switches. will put the switch into hub mode broadcasting all packets.
Term
What two things should the network admin do to prevent attackers from capturing SNMP data?
Definition
change default community strings. enable encryption.
Term
the tool filesnarf sniffs what type of data over the network?
Definition
NFS files being moved
Term
packet signing is good protection against session hijacking?
Definition
Yes. it authenticates each packet, defeating a takeover.
Term
server has received packet #120 from client. server has a receive window of 250. what's the range of packet sequence numbers that would be accepted by the server?
Definition
121-371
Term
server has received packet #120 from client. server has a receive window of 250. what's the range of packet sequence numbers that would be accepted by the server?
Definition
121-371
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