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






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






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






4. 'Encryption - where Peer X uses Peer Y






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






6. Act of encapsulating a packet within another packet.






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






8. Integrity checks are done

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9. More CPU intensive






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






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






12. Uses protocol number 51.






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






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






15. Used in IPsec for two discreet purposes:






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






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






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






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

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






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






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






23. 'MACs with hash algorithms -'






24. Key exchange for IPSEC






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






26. Does not provide payload encryption.






27. One of the most popular tunneling protocols is






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






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






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






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






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






33. A






34. Uses protocol number 50.






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






36. '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






37. DoS attacks are more probable with this mode.






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






39. Verify whether the data has been altered.






40. '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.'






41. IPSEC Encryption is performed by

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






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






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






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






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






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






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






49. 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.






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