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CCIE Sec Encryption Ipsec

Subjects : cisco, it-skills, ccie
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Invented by Ron Rivest of RSA Security (RFC 1321).






2. One of the most popular tunneling protocols is






3. 'When using the hash-based key function -'






4. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'






5. 'produces a 160-bit hash output - which makes it more difficult to decipher.'






6. 'is a block-cipher algorithm - which means that it performs operations on fixed-length data streams of 64-bit blocks. The key ostensibly consists of 64 bits; however - only 56 are actually used by the algorithm.'






7. The DES algorithm that performs 3 times sequentially.






8. 'in most cases - this mode is preferred with certificates.'






9. Uses protocol number 51.






10. The protocol of choice for key management and establishing security associations between peers on the Internet.






11. The receiving device then encrypts the data with the second key.






12. 'Three keys encrypt the data - which results in a 168-bit encryption key. The sending device encrypts the data with the first 56-bit key.'






13. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'






14. 'Encryption - where Peer X uses Peer Y






15. IPSec SAs are negotiated and protected by the existing IPsec SA.






16. Uses IKE for key exchange.






17. Integrity checks are done

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18. 'A 56-bit encryption algorithm - meaning the number of possible keys






19. A variable block- length and key-length cipher.






20. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'






21. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.






22. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.






23. RFC 2631 on the workings of the key generation/exchange process.






24. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.






25. The receiving device decrypts the data with the third key.






26. 'Digital signatures. Peer X encrypts a hash value with his private key and then sends the data to Peer Y. Peer Y obtains Peer X






27. 'DSA is roughly the same speed as RSA when creating signatures - but 10 to 40 times slower when verifying signatures. Because verification happens more frequently than creation - this issue is worth noting when deploying DSA in any environment.'






28. 'MACs with hash algorithms -'






29. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.






30. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'






31. 'It is not used for encryption or digital signatures; it is used to obtain a shared secret






32. DoS attacks are more probable with this mode.






33. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'






34. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'






35. Uses the D-H algorithm to come to agreement over a public network.






36. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'






37. 'often called public-key algorithms - do not rely on a randomly generated shared encryption key; instead - they create two static keys. These static keys are completely different - but mathematically bound to each other; what one key encrypts - the o






38. ' is defined in RFC 3174. has as output a 160-bit value -'






39. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits

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40. Main disadvantage of asymmetric algorithms is that they are slow.






41. Act of encapsulating a packet within another packet.






42. Data integrity is the process of making sure data is not tampered with while it






43. Used in government installs and was created to work with the SHA-1 hash algorithm.






44. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'






45. It also provides protection for ISAKMP peer identities with encryption.






46. Used in IPsec for two discreet purposes:






47. Where the original Layer 3 header and payload inside an IPsec packet is encapsulated. Tunnel mode does add overhead to each packet and uses some additional CPU resources.






48. That authenticate data packets and ensure that data is not tampered with or modified.






49. Is a two-phase protocol: The first phase establishes a secure authenticated channel and the second phase is where SAs are negotiated on behalf of the IPsec services.






50. Used for integrity checks on peer and data sent by peer and for authentication checks.