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






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

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3. More CPU intensive






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






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






6. Verify whether the data has been altered.






7. Act of encapsulating a packet within another packet.






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






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






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






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






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






13. 'Encryption - where Peer X uses Peer Y






14. '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.'






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






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






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






18. IPSEC Encryption is performed by

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






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






21. Can be implemented efficiently on a wide range of processors and in hardware.






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






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






24. '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.'






25. Integrity checks are done

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






27. One of the most popular tunneling protocols is






28. Does not provide payload encryption.






29. Used in IPsec for two discreet purposes:






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






31. 'MACs with hash algorithms -'






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






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






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






35. '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.'






36. 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.






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






38. 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.






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






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






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






42. '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.'






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






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






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






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






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






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






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






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