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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 SAs are negotiated and protected by the existing IPsec SA.






2. A






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






4. 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.






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






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






7. Uses protocol number 50.






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






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






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






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






12. '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






13. The DES algorithm that performs 3 times sequentially.






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






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






16. 'MACs with hash algorithms -'






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






18. DoS attacks are more probable with this mode.






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






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






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






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






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

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






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






26. 'Encryption - where Peer X uses Peer Y






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

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






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






30. Provides authentication and encryption of the payload.






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






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






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






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






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






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






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






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






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






40. '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






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






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






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

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






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






46. 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.






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






48. Uses protocol number 51.






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






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