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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. 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.






2. The DES algorithm that performs 3 times sequentially.






3. IPSEC Encryption is performed by

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4. Uses IKE for key exchange.






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






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






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






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






9. Uses protocol number 51.






10. Provides authentication and encryption of the payload.






11. 'MACs with hash algorithms -'






12. '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






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






14. 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.






15. IPSec SAs are negotiated and protected by the existing IPsec SA.






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






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






18. Used in IPsec for two discreet purposes:






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






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

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






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






23. '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.'






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






25. '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.'






26. '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.'






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






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






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






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






31. '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.'






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






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






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






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






37. Common key size is 1024 bits.






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






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






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






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






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






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






44. Uses protocol number 50.






45. 'Encryption - where Peer X uses Peer Y






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






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

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






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






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