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






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






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






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






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






6. DoS attacks are more probable with this mode.






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






8. '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






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

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10. Uses protocol number 50.






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






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






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






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






16. Uses IKE for key exchange.






17. 'MACs with hash algorithms -'






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






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






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






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






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






23. 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.






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






25. 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.






26. '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.'






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






28. 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.






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






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






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






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






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






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






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






36. The DES algorithm that performs 3 times sequentially.






37. 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.






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






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






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






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






42. 'Encryption - where Peer X uses Peer Y






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






44. Does not provide payload encryption.






45. '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.'






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






47. IPSEC Encryption is performed by

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48. One of the most popular tunneling protocols is






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






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