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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. Uses protocol number 50.






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






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






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






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






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






7. '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






8. Uses IKE for key exchange.






9. More CPU intensive






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






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






12. Act of encapsulating a packet within another packet.






13. '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.'






14. Uses protocol number 51.






15. Verify whether the data has been altered.






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






17. Does not provide payload encryption.






18. The DES algorithm that performs 3 times sequentially.






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






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






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






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






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






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






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






26. '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.'






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






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






29. A






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






31. Integrity checks are done

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32. '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.'






33. DoS attacks are more probable with this mode.






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

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






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






37. '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.'






38. Provides authentication and encryption of the payload.






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

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






41. Used in IPsec for two discreet purposes:






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






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






44. 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.






45. 'MACs with hash algorithms -'






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






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






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






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






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

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