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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. '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






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






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






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






5. A






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






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






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






9. 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.






10. Uses protocol number 51.






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






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






13. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.






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






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






16. 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.






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






18. Does not provide payload encryption.






19. 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.






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






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






22. 'Encryption - where Peer X uses Peer Y






23. '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.'






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






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






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






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






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






29. 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.






30. One of the most popular tunneling protocols is






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






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






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






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






35. Act of encapsulating a packet within another packet.






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






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






38. Key exchange for IPSEC






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






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






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






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






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






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






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






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






47. Uses protocol number 50.






48. '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.'






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






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

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