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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. IPsec implements using a shim header between L2 and L3






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






3. Verify whether the data has been altered.






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






5. '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






6. The DES algorithm that performs 3 times sequentially.






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

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






9. 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.






10. Provides authentication and encryption of the payload.






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






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






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






14. Act of encapsulating a packet within another packet.






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






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






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






18. DoS attacks are more probable with this mode.






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






20. '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






21. Uses protocol number 51.






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






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






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






25. Key exchange for IPSEC






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






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






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






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






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






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






33. '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.'






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






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






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






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






38. Integrity checks are done

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






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






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






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






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






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

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46. 'MACs with hash algorithms -'






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






48. A






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






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