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






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






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






4. Act of encapsulating a packet within another packet.






5. '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.'






6. Does not provide payload encryption.






7. Uses protocol number 51.






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






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






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






11. 'MACs with hash algorithms -'






12. Used in IPsec for two discreet purposes:






13. Turns clear-text data into cipher text with an encryption algorithm. The receiving station decrypts the data from cipher text into clear text. The encryption key is a shared secret key that encrypts and decrypts messages.






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






15. This mode does not support identity protection or protection against clogging attacks and spoofing.






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






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






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






19. Uses protocol number 50.






20. '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.'






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






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






23. IPSEC Encryption is performed by

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






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






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






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






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






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

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






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






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






33. The DES algorithm that performs 3 times sequentially.






34. More CPU intensive






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






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

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

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






39. Provides authentication and encryption of the payload.






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






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






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






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






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






45. Common key size is 1024 bits.






46. A






47. Verify whether the data has been altered.






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






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






50. '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.'