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






2. Uses IKE for key exchange.






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






4. Uses protocol number 50.






5. 'is a block-cipher algorithm - which means that it performs operations on fixed-length data streams of 64-bit blocks. The key ostensibly consists of 64 bits; however - only 56 are actually used by the algorithm.'






6. Does not provide payload encryption.






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






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






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






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






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

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

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13. DoS attacks are more probable with this mode.






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






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






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






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






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






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






20. Uses protocol number 51.






21. 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.






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






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






24. A






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






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






27. '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.'






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






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






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






31. Integrity checks are done

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32. '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.'






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






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






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






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






37. Act of encapsulating a packet within another packet.






38. Provides authentication and encryption of the payload.






39. More CPU intensive






40. '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.'






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






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






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






44. 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.






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






46. Used in IPsec for two discreet purposes:






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






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






49. Key exchange for IPSEC






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