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






2. '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






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






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






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






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






7. 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.






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






9. '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.'






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






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






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






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






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

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






16. More CPU intensive






17. Does not provide payload encryption.






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






19. Key exchange for IPSEC






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






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






22. Uses protocol number 50.






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






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






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






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






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






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






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






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






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






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






33. 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.






34. IPSEC Encryption is performed by

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35. 'Encryption - where Peer X uses Peer Y






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






37. 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.






38. Provides authentication and encryption of the payload.






39. '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.'






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






41. Uses protocol number 51.






42. '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.'






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






44. DoS attacks are more probable with this mode.






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

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






47. Uses IKE for key exchange.






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






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






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







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