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CEH v11 Revision > Scanning and Enumeration > Flashcards

Scanning and Enumeration Flashcards

1
Q

What type an attack is DNS Bruteforcing? (Active or Passive)

A

Passive.

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2
Q

TCP Flag

What is SYN (Synchronize) flag used for?

A

Set during initial communication. Negotiating of parameters and sequence numbers

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3
Q

TCP Flag

What is ACK (Acknowledgment) flag used for?

A

Set as an acknowledgement to the SYN flag. Always set after initial SYN

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4
Q

TCP Flag

What is RST (Reset) flag used for?

A

Forces the termination of a connection (in both directions)

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5
Q

TCP Flag

What is FIN (Finish) flag used for?

A

Ordered close to communications

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6
Q

TCP Flag

What is PSH (Push) flag used for?

A

Forces the delivery of data without concern for buffering

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7
Q

TCP Flag

What is URG (Urgent) flag used for?

A

Data inside is being sent out of band. Example is cancelling a message

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8
Q

What is the 3 step TCP handshake?

A
  1. SYN
  2. SYN-ACK
  3. ACK
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9
Q

What does ICMP stand for?

A

Internet Control Message Protocol

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10
Q

What ICMP message type is 0?

A

0: Echo Reply

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11
Q

What ICMP message type is 3?

A

3: Destination Unreachable

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12
Q

What ICMP message type is 4?

A

4: Source Quench

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13
Q

What ICMP message type is 5?

A

5: Redirect

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14
Q

What ICMP message type is 8?

A

8: Echo Request

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15
Q

What ICMP message type is 11?

A

11: Time Exceeded

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16
Q

Nmap

How do you initiate Full Connect Scan?

A

nmap -sT

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17
Q

Nmap

How do you initiate Stealth (SYN )Scan?

A

nmap -sS

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18
Q

Nmap

How do you initiate ACK Scan?

A

nmap -sA

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19
Q

Nmap

How do you initiate FIN scan?

A

nmap -sF

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20
Q

Nmap

How do you initiate IDLE (Zombie) Scan

A

nmap -sI

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21
Q

Nmap

How do you initiate DNS List Scan?

A

nmap -sL

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22
Q

Nmap

How do you initiate NULL Scan?

A

nmap -sN

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23
Q

Nmap

How do you initiate Protocol Scan?

A

nmap -sO

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24
Q

Nmap

How do you initiate Ping Scan?

A

nmap -sP

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25
Q

Nmap

How do you initiate RPC scan?

A

nmap -sR

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26
Q

Nmap

How do you initiate Window scan?

A

nmap -sW

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27
Q

Nmap

How do you initiate Xmas scan?

A

nmap -sX

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28
Q

Nmap

How do you initiate ICMP ping?

A

nmap -PI

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29
Q

Nmap

How do you initiate No ping?

A

nmap -Pn

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30
Q

Nmap

How do you initiate SYN ping?

31
Q

Nmap

How do you initiate TCP ping?

32
Q

Nmap

How do you set packet fragmentation flag?

33
Q

Nmap

How do you set Decoy flag?

34
Q

Hping

How do you initiate ICMP mode?

35
Q

Hping

How do you initiate UDP mode?

36
Q

Hping

How do you initiate Scan mode?

37
Q

Hping

How do you initiate Listen mode?

38
Q

Hping

How do you initiate Flood mode?

A

hping3 –flood

39
Q

Hping

How do you collect sequence numbers?

40
Q

Hping

How do you set port number?

41
Q

Hping

How do you set FIN flag?

42
Q

Hping

How do you set SYN flag?

43
Q

Hping

How do you set RST flag?

44
Q

Hping

How do you set PSH flag?

45
Q

Hping

How do you set ACK flag?

46
Q

Hping

How do you set URG flag?

47
Q

Hping

How do you set Xmas flag?

48
Q

SNMP: What is the read-only string?

49
Q

SNMP: What is the read-write string?

50
Q

What is meant by the following command?

ping -t 1.1.1.1

A

Continuos ping until manually stopeed

51
Q

What is meant by the following command?

ping -a 1.1.1.1

A

Resolve hostname to IP

52
Q

What is meant by the following command?

ping -n 6 1.1.1.1

A

Ping specified amount of times (6).

53
Q

What is mean by the following command?

ping -i 12 1.1.1.1

A

-i specified Time to Live

54
Q

What records does a zone file contain?

55
Q

What tool would you use to fingerprint VPN firewalls?

56
Q

What is ping of death?

A

Sending packets that exceeds the byte limit (65,535)

57
Q

What is the proper response for a NULL scan if the port is closed?

58
Q

What is a Smurf Attack?

A

DDoS attack, floods the target network with infinite ICMP request packets with spoofed address of the networks broadcast address.

59
Q

What is the pattern to identify LM hashes that are below 8 characters long?

A

The hashes will end with AAD3B435B51404EE

60
Q

What are the 3 Access Vector Metrics used in Nessus reports?

A
  1. Local (L)
  2. Adjacent Network (A)
  3. Network (N)
61
Q

What is a Fraggle attack?

A

DoS attack that uses UDP protocol

62
Q

What is a Tear Drop attack?

A

DoS attack that exploits a packet fragment bug

63
Q

What is a SYN Flood attack?

A

Sending a SYN request to host ports and leaving incomplete TCP handshakes so other users are unable to connect.

64
Q

What is a SYN Attack?

A

Floods SYN packets to the target with spoofed source IP

65
Q

What is a ICMP Flood attack?

A

ICMP Echo requests with spoofed source IP

66
Q

What is a Peer-to-peer attack?

A

Redirect peer-to-peer connections to the target host

67
Q

What is a LAND attack?

A

Sending SYN packet to the target host with same source IP as the target, crashing the system if Vulnerable.

68
Q

What is purpose of Low Ordbit Ion Cannon (LOIC) tools?

A

TCP, UDP, HTTP DDoS tool

69
Q

What type of tools is Trinity on Linux?

70
Q

What is a Tribe Flood Network?

A

Voluntary hosts of a botnet, used for DDoS.

71
Q

Which service is NBTSTAT used against?

A

To discover information from NetBios, ports 137, 138, 139

72
Q

What is Blind/Anonymous FTP?

A

Allows users to go directly to a specific directory as long as they use the correct path and file name.

73
Q

Nmap

How do you initiate default script engine scan?

A

nmap -sC
or
nmap –script=default

74
Q

nmap script options

A

nmap –script=default
nmap –script-args= : provides arguments to script
nmap –script-args-file= : provides nse script args in a file
nmap –script-trace : shows all data sent and received
nmap –script-updatedb : updates script database
nmap –script-help : shows help

CEH v11 Revision (15 decks)

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