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






2. Uses protocol number 50.






3. Provides authentication and encryption of the payload.






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






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






6. '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






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






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






9. Does not provide payload encryption.






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






11. IPSEC Encryption is performed by

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






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






14. 'MACs with hash algorithms -'






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






16. Used in IPsec for two discreet purposes:






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






18. 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.






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






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






21. The DES algorithm that performs 3 times sequentially.






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






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






24. 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.






25. '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.'






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






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






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






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






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






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






32. Integrity checks are done

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






34. One of the most popular tunneling protocols is






35. Common key size is 1024 bits.






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






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

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38. '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.'






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






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






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






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






43. DoS attacks are more probable with this mode.






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






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. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.






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






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






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






50. A