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






2. 'Encryption - where Peer X uses Peer Y






3. Provides authentication and encryption of the payload.






4. DoS attacks are more probable with this mode.






5. '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.'






6. 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.






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

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






9. 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.






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






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

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






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






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






15. Key exchange for IPSEC






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






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






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






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






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






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






22. '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.'






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






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






25. '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.'






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






27. '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






28. '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.'






29. IPSEC Encryption is performed by

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






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






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






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






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






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






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






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






38. Verify whether the data has been altered.






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






40. Does not provide payload encryption.






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






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






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






44. Integrity checks are done

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






46. The DES algorithm that performs 3 times sequentially.






47. '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






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






49. Uses protocol number 50.






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







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