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






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

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






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






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






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






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






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






9. More CPU intensive






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






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






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






13. 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.






14. Key exchange for IPSEC






15. Common key size is 1024 bits.






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






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






18. The DES algorithm that performs 3 times sequentially.






19. '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.'






20. '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






21. 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.






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






23. 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.






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






25. Does not provide payload encryption.






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






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






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






29. Used in IPsec for two discreet purposes:






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






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






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






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






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






35. Uses IKE for key exchange.






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






37. Uses protocol number 50.






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






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






40. '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






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






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






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






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






45. Act of encapsulating a packet within another packet.






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






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






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






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






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