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






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






3. Integrity checks are done

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4. Verify whether the data has been altered.






5. Uses protocol number 51.






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






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






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






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






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






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






12. The DES algorithm that performs 3 times sequentially.






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






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






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






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






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






18. Does not provide payload encryption.






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






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






21. '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.'






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






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






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






25. DoS attacks are more probable with this mode.






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






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






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






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






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






31. Where the original Layer 3 header and payload inside an IPsec packet is encapsulated. Tunnel mode does add overhead to each packet and uses some additional CPU resources.






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






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






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






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






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






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






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






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






40. Uses protocol number 50.






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






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

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






44. '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






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






46. One of the most popular tunneling protocols is






47. '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.'






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






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






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

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