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






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






3. Uses protocol number 50.






4. A






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






6. The DES algorithm that performs 3 times sequentially.






7. 'MACs with hash algorithms -'






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






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






10. Key exchange for IPSEC






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






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






13. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.






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






15. '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.'






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






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






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






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






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






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






22. Common key size is 1024 bits.






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






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






25. DoS attacks are more probable with this mode.






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






27. 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.






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






29. Uses IKE for key exchange.






30. '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.'






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






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






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

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






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






36. Provides authentication and encryption of the payload.






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






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






39. Uses protocol number 51.






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






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






42. Act of encapsulating a packet within another packet.






43. '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.'






44. 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.






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






46. Integrity checks are done

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






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






49. More CPU intensive






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