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






2. '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.'






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






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






5. Does not provide payload encryption.






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






7. '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.'






8. Uses protocol number 50.






9. Common key size is 1024 bits.






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






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






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






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






14. The DES algorithm that performs 3 times sequentially.






15. Uses protocol number 51.






16. One of the most popular tunneling protocols is






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






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






19. 'MACs with hash algorithms -'






20. Integrity checks are done

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






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






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






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






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






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






27. 'Finally - the receiving devices decrypt the data with the first key.'






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






29. Used in IPsec for two discreet purposes:






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






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






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

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






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






35. 'defines the mode of communication - creation - and management of security associations.'






36. '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.'






37. '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.'






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






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






40. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'






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






42. Key exchange for IPSEC






43. '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






44. IPSEC Encryption is performed by

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






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






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






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






49. Uses IKE for key exchange.






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