Domain 3 virtualization&architecture

Question 1

s2.20 What is DCE? Verus what is this system? Why use DCEs?

Answer 1

Distributed computing environment. Not a centeralized system. It gives us horizaotnal scaling. modualr grwoth ,fault tolerance, coste effectiveness, low laency.

Question 2

s2.20 Grid vs HPC system. Edge vs CDN?

Answer 2

Grid is different. it uses what ever resoruce is available. Edge is closest to where it is needed. Not all edge is cdn. all cdns are edge.

Question 3

s2.22 What is emanation? What is steganography? what is cover timing channel?

Answer 3

2ndary information given. Unintentional signals. Steg: it is midden message within another media. Covert timing is manipulating the timing of events to covertly transmit information.

Question 4

s2.23 exam tip on malware

Answer 4

You will not a get definition of a malware. it will ask how to protect by words like embedded, alter signature.

Question 5

s2.24 What are rootkits?

Answer 5

Malware. Replace some of the OS/Kernel with a malicious payload. User rootkits work on ring 3 and kernel rootkits on ring 0

Question 6

s2.24 What are packers?

Answer 6

programs to compress *.exe files, which can be used to hid malware in a executable neutral technology. Trojan file. Changes the hash

Question 7

s2.24 what can help with server side atacks? Can firewalls help with client side attacks?

Answer 7

defense in depth can mitigate some of these. Firewalls do not help. they only monitor inbound traffic.

Question 8

s2.25 8min great exam tip

Question 9

s2.26 What is polyinstantiation? What is aggregation?

Answer 9

alternative facts. two or more instance of the same file depending on who accesses it. Aggregation is collection of data for the purpose of statistical analysis.

Question 10

s2.28 What is SCADA Supervisory Conrol and Data Acquistion?

Answer 10

Control system architecture that uses comptuers, networked data communications and GUI for high level process supervisory management. It uses the DNP3 Distributed Network Protocal .

Question 11

s2.29 What is difference between Cryptology and crypotgraphy? What is cipher?

Answer 11

Crptology is the science of securing communication. Crypotography is the study of creing messages where the meaning is hidden. Cipher is a cyptographi algorithm.

Question 12

s2.31 What is spartan scytale?

Answer 12

Message written lengthwise on a long thin pieceof parchment wrapped in a stick. By itself it is no sense but if rewrapped around a stick of hte same diameter it would be decipherable.

Question 13

s2.31 What is caesar cipher?

Answer 13

done by switching letters by a certain number of spots in the alphabet.

Question 14

s2.31Vigenere cipher?

Answer 14

16th century. alphabet is repeated 26 times to form a matrix.

Question 15

s2.31 What is cipher disk?

Answer 15

2 concertric disk with alphabets on them.

Question 16

s2.31 What is purple?

Answer 16

japanese rotary based very similar to the enigma. 3 rotors. German enigma is 4 rotors.

Question 17

s2.32 What is one time pad in cryptogprahy?

Answer 17

Algorithm where plaintext is combined with a random key. Unbreakable but very iimpractical. Charactered must be random

Question 18

s2.32 What is vernam cipher?

Answer 18

1st known use of one time pad. Used in bits and bits were XOR’d in plaintext bits.

Question 19

s2.32 Project VENONA?

Answer 19

US and UK broke KGB one time pad. KGB reused pads and many messages were decoded.

Question 20

s2.32 What is Jefferson Disk (Bazeries Cylinder)?

Answer 20

a cipher system each with 26 letters around the edge. each disk hasa unique number. the order of the disk is the cipher key. Both sender and receiver must arrange the disk in the same predefined order.

Question 21

s2.32 What is Sigaba?

Answer 21

US version of the enigma. It has 3x5 = 15 set of rotors. no successful cryptanalysis known.

Question 22

s2.32 what is cocom and wassenaar arrangement?

Answer 22

cocom prevent the export of critical tech. ended in 94. Wassenaar is from 96 to now. limits exports for dual use tech. crypotgraphy is part of that.

Question 23

s2.32 What is monoaplhabetic substitution?

Answer 23

Its a cipher text encryption using frequency to replace each letter of the plain text. Frequency analysis is an attack message

Question 24

s2.32 What is transposition? What is substitution?

Answer 24

IT is a cryptographic method that rearranging the letters of the plaintext. Substitution is replacing the plaintext symbols with other symbols.