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






2. Uses protocol number 51.






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






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






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






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






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

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8. The DES algorithm that performs 3 times sequentially.






9. 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.






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






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

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12. 'is a more secure version of MD5 - and hash-based message authentication codes (HMAC) provides further security with the inclusion of a key-based hash.'






13. '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.'






14. Uses IKE for key exchange.






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






16. '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






17. 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.






18. Does not provide payload encryption.






19. Integrity checks are done

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






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






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






23. '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.'






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

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






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






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






28. IPSEC Encryption is performed by

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






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






31. 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.






32. 'key exchange is vulnerable to a man-in-the-middle attack. You can rectify this problem by allowing the two parties to authenticate themselves to each other with a shared secret key - digital signatures - or public-key certificates.'






33. DoS attacks are more probable with this mode.






34. Key exchange for IPSEC






35. Used in IPsec for two discreet purposes:






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






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






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






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






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






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






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






43. One of the most popular tunneling protocols is






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






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






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






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






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






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






50. Uses protocol number 50.







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