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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. Uses protocol number 50.






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






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






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






5. Act of encapsulating a packet within another packet.






6. '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.'






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






8. '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.'






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






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






11. '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.'






12. Provides authentication and encryption of the payload.






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






14. Uses IKE for key exchange.






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

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






17. 'Encryption - where Peer X uses Peer Y






18. 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.






19. 'MACs with hash algorithms -'






20. Integrity checks are done

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21. '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






22. Key exchange for IPSEC






23. '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.'






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






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






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






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






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






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






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






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






32. DoS attacks are more probable with this mode.






33. 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.






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






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






36. 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.






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






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






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






40. Does not provide payload encryption.






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






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

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43. 'often called public-key algorithms - do not rely on a randomly generated shared encryption key; instead - they create two static keys. These static keys are completely different - but mathematically bound to each other; what one key encrypts - the o






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






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






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






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






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






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






50. One of the most popular tunneling protocols is