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






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






3. Uses protocol number 51.






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






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






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






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






8. '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.'






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






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






11. 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.






12. Does not provide payload encryption.






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






14. IPSEC Encryption is performed by

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






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






17. '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.'






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






19. '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






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






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






22. A






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






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

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25. Provides authentication and encryption of the payload.






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






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

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






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






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






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






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






33. '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






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






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

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






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






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






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






40. Integrity checks are done

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41. '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.'






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






43. 'MACs with hash algorithms -'






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






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






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






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






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






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






50. The DES algorithm that performs 3 times sequentially.