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






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






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






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






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






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






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






8. Integrity checks are done

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






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






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






12. Verify whether the data has been altered.






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






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






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






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






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






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






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






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






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






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






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

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






25. Provides authentication and encryption of the payload.






26. Key exchange for IPSEC






27. '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.'






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






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






30. Common key size is 1024 bits.






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






32. Uses IKE for key exchange.






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






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






36. DoS attacks are more probable with this mode.






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






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






39. 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.






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






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






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






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






44. 'Encryption - where Peer X uses Peer Y






45. '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






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






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






48. Uses protocol number 50.






49. '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.'






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