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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. '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.'






2. '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






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






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






5. The DES algorithm that performs 3 times sequentially.






6. Uses IKE for key exchange.






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






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






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






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






11. '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






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






13. IPSEC Encryption is performed by

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






15. Act of encapsulating a packet within another packet.






16. DoS attacks are more probable with this mode.






17. Does not provide payload encryption.






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






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






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






21. IPSEC tunnels data through IP using one of two protocols?






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






23. Verify whether the data has been altered.






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






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

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26. A






27. 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.






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






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






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






31. Common key size is 1024 bits.






32. '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.'






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






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






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






36. Uses protocol number 50.






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






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






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






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






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






42. 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.






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






44. 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.






45. 'Encryption - where Peer X uses Peer Y






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






47. '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.'






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






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






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







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