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






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






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






5. 'Encryption - where Peer X uses Peer Y






6. More CPU intensive






7. '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.'






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






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

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10. '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.'






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






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






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






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






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






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






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






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






19. 'MACs with hash algorithms -'






20. 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.






21. A






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






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






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






25. '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.'






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






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






28. 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.






29. Does not provide payload encryption.






30. Used in IPsec for two discreet purposes:






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






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






33. '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.'






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






35. One of the most popular tunneling protocols is






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






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

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






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






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






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






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






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






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






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






46. '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.'






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






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






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






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