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






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






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






4. A






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






6. Uses protocol number 51.






7. Key exchange for IPSEC






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






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






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






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






12. IPSEC Encryption is performed by

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






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

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15. DoS attacks are more probable with this mode.






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






17. Act of encapsulating a packet within another packet.






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. 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.






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






21. Used in IPsec for two discreet purposes:






22. '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.'






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






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






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

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






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






28. Does not provide payload encryption.






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






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






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






32. Uses protocol number 50.






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






34. 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.






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






36. 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.






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






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






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






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






41. '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.'






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






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






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






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






46. 'MACs with hash algorithms -'






47. Provides authentication and encryption of the payload.






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






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






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







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