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






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






3. Verify whether the data has been altered.






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






5. 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.






6. Uses protocol number 51.






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






8. '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.'






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






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






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






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






13. Common key size is 1024 bits.






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






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






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






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

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






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






20. No additional Layer 3 header is created. The original Layer 3 header is used.






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






22. One of the most popular tunneling protocols is






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






24. A






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






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






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






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






29. Key exchange for IPSEC






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






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






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






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






34. The DES algorithm that performs 3 times sequentially.






35. Does not provide payload encryption.






36. Act of encapsulating a packet within another packet.






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






38. Turns clear-text data into cipher text with an encryption algorithm. The receiving station decrypts the data from cipher text into clear text. The encryption key is a shared secret key that encrypts and decrypts messages.






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

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40. IPSEC Encryption is performed by

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41. 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.






42. '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






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






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






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






46. '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.'






47. Uses protocol number 50.






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

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






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