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






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






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






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






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






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






7. 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.






8. '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.'






9. A






10. Uses IKE for key exchange.






11. '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.'






12. '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






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






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






15. IPSEC Encryption is performed by

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






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






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






19. '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.'






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






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






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






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






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






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






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

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






28. Act of encapsulating a packet within another packet.






29. A variable block- length and key-length cipher.






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

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31. 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.






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






33. '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.'






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






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






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






37. DoS attacks are more probable with this mode.






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






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






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






41. Provides authentication and encryption of the payload.






42. Uses protocol number 51.






43. '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.'






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






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






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






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

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






49. Key exchange for IPSEC






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