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






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






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






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






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






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






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






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






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






10. Uses protocol number 51.






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






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






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

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14. DoS attacks are more probable with this mode.






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






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






17. Act of encapsulating a packet within another packet.






18. 'Encryption - where Peer X uses Peer Y






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






20. One of the most popular tunneling protocols is






21. '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.'






22. Uses protocol number 50.






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






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






25. Uses IKE for key exchange.






26. 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.






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






28. Integrity checks are done

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






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






31. The DES algorithm that performs 3 times sequentially.






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






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






34. Provides authentication and encryption of the payload.






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






36. '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.'






37. Does not provide payload encryption.






38. Common key size is 1024 bits.






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






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






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






42. Key exchange for IPSEC






43. 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.






44. '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.'






45. '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.'






46. Verify whether the data has been altered.






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






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






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






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







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