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






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






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






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






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






6. A






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






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






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






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






11. '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.'






12. Used in IPsec for two discreet purposes:






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






14. The DES algorithm that performs 3 times sequentially.






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






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






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

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18. 'key exchange is vulnerable to a man-in-the-middle attack. You can rectify this problem by allowing the two parties to authenticate themselves to each other with a shared secret key - digital signatures - or public-key certificates.'






19. Does not provide payload encryption.






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






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






22. '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.'






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






24. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.






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

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






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






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






29. IPSEC Encryption is performed by

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30. Uses protocol number 50.






31. Integrity checks are done

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32. Uses IKE for key exchange.






33. 'is a more secure version of MD5 - and hash-based message authentication codes (HMAC) provides further security with the inclusion of a key-based hash.'






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






35. Common key size is 1024 bits.






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






37. 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.






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






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






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






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






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






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






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






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






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






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






48. Provides authentication and encryption of the payload.






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






50. More CPU intensive







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