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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. Provides authentication and encryption of the payload.






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






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






4. Does not provide payload encryption.






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






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

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






8. One of the most popular tunneling protocols is






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






10. 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.






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






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






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






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






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






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






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






19. '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.'






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






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






23. 'Encryption - where Peer X uses Peer Y






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






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






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






27. Act of encapsulating a packet within another packet.






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






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






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






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






32. '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






33. Verify whether the data has been altered.






34. Integrity checks are done

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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. 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.






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

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






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






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






41. More CPU intensive






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






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






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






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






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






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






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






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






50. Used in IPsec for two discreet purposes: