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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. 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.






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






3. 'Encryption - where Peer X uses Peer Y






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






5. 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.






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






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






8. '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.'






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






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






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






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

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






14. '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.'






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






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






17. '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.'






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






19. Uses protocol number 51.






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






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






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






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






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






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






26. Does not provide payload encryption.






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






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






29. DoS attacks are more probable with this mode.






30. Verify whether the data has been altered.






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

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






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

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34. '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.'






35. Integrity checks are done

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






37. Common key size is 1024 bits.






38. '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.'






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






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






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






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






43. '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.'






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






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






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






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






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






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






50. A







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