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






2. 'MACs with hash algorithms -'






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






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






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






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






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






8. Uses IKE for key exchange.






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. One of the most popular tunneling protocols is






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






12. Provides authentication and encryption of the payload.






13. '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






14. Act of encapsulating a packet within another packet.






15. '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






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






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






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






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






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






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

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






23. 'Encryption - where Peer X uses Peer Y






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






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






26. More CPU intensive






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






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






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






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






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

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






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






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






36. 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.






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






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






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






40. IPSEC Encryption is performed by

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






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






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






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






45. '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.'






46. Key exchange for IPSEC






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






48. Used in IPsec for two discreet purposes:






49. 'key exchange is vulnerable to a man-in-the-middle attack. You can rectify this problem by allowing the two parties to authenticate themselves to each other with a shared secret key - digital signatures - or public-key certificates.'






50. A