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






2. A






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






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






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






6. 'Encryption - where Peer X uses Peer Y






7. Common key size is 1024 bits.






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






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






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






11. Does not provide payload encryption.






12. More CPU intensive






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






14. 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.






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






16. 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.






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






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






19. Integrity checks are done

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20. Used in IPsec for two discreet purposes:






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






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






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






24. Uses protocol number 51.






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






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






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






28. Key exchange for IPSEC






29. 'MACs with hash algorithms -'






30. IPSEC Encryption is performed by

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






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






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

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






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






36. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.






37. '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.'






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






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






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

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






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






43. '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.'






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






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






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






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

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






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






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