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






2. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.






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






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






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






6. 'Encryption - where Peer X uses Peer Y






7. IPSEC Encryption is performed by

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






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






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






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






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






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

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






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






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






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






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






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






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






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






22. '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






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






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






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






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






27. Uses protocol number 51.






28. '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






29. 'MACs with hash algorithms -'






30. '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.'






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






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






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






34. 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.






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






36. More CPU intensive






37. '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.'






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






39. A






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






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






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






43. The DES algorithm that performs 3 times sequentially.






44. Key exchange for IPSEC






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






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






47. '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.'






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






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






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