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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. Uses protocol number 51.






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






3. Has a trailer which identifies IPsec information and ESP integrity-check information.






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






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






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






7. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.






8. One of the most popular tunneling protocols is






9. '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






10. 'Finally - the receiving devices decrypt the data with the first key.'






11. Uses IKE for key exchange.






12. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'






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






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






15. Integrity checks are done

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16. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'






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






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






19. '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






20. 'defines the mode of communication - creation - and management of security associations.'






21. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm

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






23. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'






24. IPSEC tunnels data through IP using one of two protocols?






25. Provide authentication in Internet Key Exchange (IKE) Phase 2.






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






27. The sending device encrypts for a final time with another 56-bit key.






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






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






30. 'The sending device decrypts the data with the second key - which is also 56 bits in length.'






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






32. More CPU intensive






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






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






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






36. Act of encapsulating a packet within another packet.






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






38. Key exchange for IPSEC






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






40. Used in IPsec for two discreet purposes:






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






42. Provides authentication and encryption of the payload.






43. Can be implemented efficiently on a wide range of processors and in hardware.






44. 'MACs with hash algorithms -'






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






46. You use this encryption method by keeping one key private and giving the other key to anyone in the public Internet. It does not matter who has your public key; it is useless without the private key.






47. '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.'






48. 'Encryption - where Peer X uses Peer Y






49. Invented by Ron Rivest of RSA Security (RFC 1321).






50. It uses UDP 500 and is defined by RFC 2409.







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