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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 51.






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






3. 'MACs with hash algorithms -'






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






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






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






7. '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






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

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






10. Integrity checks are done

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






12. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'






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






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






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






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






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






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






19. Does not provide payload encryption.






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






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






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






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






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






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






26. 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.






27. Verify whether the data has been altered.






28. Uses IKE for key exchange.






29. One of the most popular tunneling protocols is






30. IPSEC Encryption is performed by

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






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






33. Act of encapsulating a packet within another packet.






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






35. Key exchange for IPSEC






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






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

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






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






40. Is a two-phase protocol: The first phase establishes a secure authenticated channel and the second phase is where SAs are negotiated on behalf of the IPsec services.






41. A






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






43. '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.'






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






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






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






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






48. '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.'






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






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