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






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






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






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






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






6. Used in IPsec for two discreet purposes:






7. Uses protocol number 51.






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






9. 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.






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






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






12. Verify whether the data has been altered.






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






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

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15. '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






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






17. DoS attacks are more probable with this mode.






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






19. A






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






21. Uses protocol number 50.






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






23. Uses IKE for key exchange.






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






25. '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






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






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






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






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






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






31. '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.'






32. '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.'






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






34. One of the most popular tunneling protocols is






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






36. Common key size is 1024 bits.






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






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






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






40. 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.






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






42. 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.






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






44. 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.






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






46. Integrity checks are done

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47. Provides authentication and encryption of the payload.






48. 'Encryption - where Peer X uses Peer Y






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






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