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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. More CPU intensive






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






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






4. Act of encapsulating a packet within another packet.






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






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






7. Provides authentication and encryption of the payload.






8. A






9. 'MACs with hash algorithms -'






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






11. Uses protocol number 50.






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






13. Uses protocol number 51.






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






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






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






17. IPSEC Encryption is performed by

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

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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. 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.






21. '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.'






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






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






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






26. Uses IKE for key exchange.






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






28. '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.'






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






30. 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.






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

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






33. One of the most popular tunneling protocols is






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






35. DoS attacks are more probable with this mode.






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






37. 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.






38. '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






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






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






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






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






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






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






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






47. The DES algorithm that performs 3 times sequentially.






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






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






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