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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. Common key size is 1024 bits.






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






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






4. Act of encapsulating a packet within another packet.






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






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






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






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






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






10. 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.






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






12. '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.'






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






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






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






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






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






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






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






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






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






22. Integrity checks are done

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






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






25. More CPU intensive






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






27. Key exchange for IPSEC






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






29. Does not provide payload encryption.






30. 'MACs with hash algorithms -'






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






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

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33. Provides authentication and encryption of the payload.






34. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.






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






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






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






38. '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.'






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






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

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






42. Uses IKE for key exchange.






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






44. '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






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






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






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






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






49. DoS attacks are more probable with this mode.






50. Uses protocol number 50.