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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. IPSEC Encryption is performed by

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2. Used in IPsec for two discreet purposes:






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






4. Act of encapsulating a packet within another packet.






5. 'Encryption - where Peer X uses Peer Y






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






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






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






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






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






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






12. 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.






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






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






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






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






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






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






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






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






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






22. Verify whether the data has been altered.






23. Provides authentication and encryption of the payload.






24. Uses IKE for key exchange.






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






26. More CPU intensive






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






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






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






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






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






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






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






34. Common key size is 1024 bits.






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






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






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






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






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






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






41. Does not provide payload encryption.






42. The DES algorithm that performs 3 times sequentially.






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






44. 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.






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






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






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






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. Uses protocol number 51.






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