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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. 'provides everything required to securely connect over a public media - such as the Internet.'






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






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






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






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






6. 'Encryption - where Peer X uses Peer Y






7. 'MACs with hash algorithms -'






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






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






10. '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.'






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






12. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'






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






14. 'requires that the sender and receiver have key pairs. By combining the sender






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






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

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






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






19. Verify whether the data has been altered.






20. Negotiation of the ISAKMP policy by offering and acceptance of protection suites






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






22. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).






23. Used in IPsec for two discreet purposes:






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






25. The DES algorithm that performs 3 times sequentially.






26. Negotiation of the ISAKMP policy by offering and acceptance of protection suites

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






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






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






30. Integrity checks are done

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






32. No additional Layer 3 header is created. The original Layer 3 header is used.






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






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






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






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






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






38. Uses IKE for key exchange.






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






40. '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






41. DoS attacks are more probable with this mode.






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






43. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.






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

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






46. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.






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






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






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






50. '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.'