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






2. IPsec implements using a shim header between L2 and L3






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






4. One of the most popular tunneling protocols is






5. A






6. Key exchange for IPSEC






7. Common key size is 1024 bits.






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

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






10. Uses protocol number 50.






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






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






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






14. '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.'






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






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






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






18. 'Encryption - where Peer X uses Peer Y






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






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






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






22. Integrity checks are done

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






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






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






26. The DES algorithm that performs 3 times sequentially.






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






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






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






30. Provides authentication and encryption of the payload.






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

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






33. IPSEC Encryption is performed by

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






35. Verify whether the data has been altered.






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






37. Used in IPsec for two discreet purposes:






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






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






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






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






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






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






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

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45. '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






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






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






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






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