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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 tunnels data through IP using one of two protocols?






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






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






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






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






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






7. Uses protocol number 50.






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






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






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






11. '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.'






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






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

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






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






16. A






17. Key exchange for IPSEC






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






19. 'Message digest algorithms have a drawback whereby a hacker (man in the middle) can intercept a message containing the packet and hash values - then re-create and transmit a modified packet with the same calculated hash to the target destination.'






20. Common key size is 1024 bits.






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






22. 'Encryption - where Peer X uses Peer Y






23. 'produces a 160-bit hash output - which makes it more difficult to decipher.'






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






25. One of the most popular tunneling protocols is






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






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






28. Does not provide payload encryption.






29. DoS attacks are more probable with this mode.






30. Uses protocol number 51.






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






32. Uses IKE for key exchange.






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

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






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






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






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. '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.'






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






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






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






42. Integrity checks are done

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






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






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






46. '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.'






47. '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.'






48. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'






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






50. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.







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