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






2. More CPU intensive






3. Key exchange for IPSEC






4. 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.






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






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






7. Verify whether the data has been altered.






8. 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.






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






10. The sending device encrypts for a final time with another 56-bit key.






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






12. 'MACs with hash algorithms -'






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






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






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






16. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.






17. '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.'






18. Common key size is 1024 bits.






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






20. '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.'






21. '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.'






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






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






24. IPSEC Encryption is performed by

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






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






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






28. Does not provide payload encryption.






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






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






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






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






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






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






35. 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.






36. Provides authentication and encryption of the payload.






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






38. 'Encryption - where Peer X uses Peer Y






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






40. '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.'






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






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

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






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






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

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






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






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






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






50. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'