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






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






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

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4. '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.'






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






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






7. More CPU intensive






8. Common key size is 1024 bits.






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






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






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






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






13. 'Encryption - where Peer X uses Peer Y






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






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






16. 'MACs with hash algorithms -'






17. 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.






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






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






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






21. Uses protocol number 50.






22. DoS attacks are more probable with this mode.






23. Uses IKE for key exchange.






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






25. Key exchange for IPSEC






26. IPSEC Encryption is performed by

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






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






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






30. The DES algorithm that performs 3 times sequentially.






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






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






33. 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.






34. '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






35. Used in IPsec for two discreet purposes:






36. '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.'






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






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






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






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






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






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






43. '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.'






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






45. '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.'






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

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47. Uses protocol number 51.






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






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