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






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






3. '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






4. Uses protocol number 50.






5. 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.






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






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






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






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






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






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






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






13. 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.






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






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






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






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






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






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






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

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






22. Key exchange for IPSEC






23. Uses IKE for key exchange.






24. 'A 56-bit encryption algorithm - meaning the number of possible keys






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






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






27. '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.'






28. IPSEC Encryption is performed by

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29. Uses protocol number 51.






30. '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.'






31. '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.'






32. 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.






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






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






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






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






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






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






39. Integrity checks are done

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40. '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.'






41. More CPU intensive






42. 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.






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






44. '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.'






45. The DES algorithm that performs 3 times sequentially.






46. 'Encryption - where Peer X uses Peer Y






47. 'MACs with hash algorithms -'






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






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






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







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