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






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






3. One of the most popular tunneling protocols is






4. 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.






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






6. Uses IKE for key exchange.






7. Key exchange for IPSEC






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






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






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






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






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






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






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






15. '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






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






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






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






19. 'Encryption - where Peer X uses Peer Y






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






21. Integrity checks are done

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22. Used in IPsec for two discreet purposes:






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

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24. Turns clear-text data into cipher text with an encryption algorithm. The receiving station decrypts the data from cipher text into clear text. The encryption key is a shared secret key that encrypts and decrypts messages.






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






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






27. Verify whether the data has been altered.






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






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






30. '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.'






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






32. Provides authentication and encryption of the payload.






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






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






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






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






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






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






39. Does not provide payload encryption.






40. More CPU intensive






41. Act of encapsulating a packet within another packet.






42. '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.'






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






44. Provide authentication in Internet Key Exchange (IKE) Phase 2.






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






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






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






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






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