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






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






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






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






5. 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.






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






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






8. '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






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






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






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






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






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






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






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






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






17. A






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






19. Used in IPsec for two discreet purposes:






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






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






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






23. Key exchange for IPSEC






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






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






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






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






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






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






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






31. One of the most popular tunneling protocols is






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






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






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






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






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






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






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






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






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






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






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






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

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






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






47. Common key size is 1024 bits.






48. The DES algorithm that performs 3 times sequentially.






49. Provides authentication and encryption of the payload.






50. '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.'







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