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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. IPSEC Encryption is performed by

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2. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits

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






4. Integrity checks are done

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






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






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






8. 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.






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

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10. Does not provide payload encryption.






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






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






13. '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.'






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






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






16. Verify whether the data has been altered.






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






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

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






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






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






22. 'MACs with hash algorithms -'






23. More CPU intensive






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






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






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






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






28. Key exchange for IPSEC






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






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






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






32. The DES algorithm that performs 3 times sequentially.






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






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






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






36. One of the most popular tunneling protocols is






37. '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






38. Uses IKE for key exchange.






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






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






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






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






43. Common key size is 1024 bits.






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






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






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






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






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






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






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