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






2. 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.






3. '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






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






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






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






7. Used in IPsec for two discreet purposes:






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






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






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






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






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






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






14. Act of encapsulating a packet within another packet.






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






16. More CPU intensive






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






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






19. A






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






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






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






23. '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.'






24. '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.'






25. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm

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26. Uses protocol number 51.






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






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






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






30. 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.






31. The DES algorithm that performs 3 times sequentially.






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






33. IPSEC Encryption is performed by

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

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






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






37. Integrity checks are done

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38. 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.






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






40. Common key size is 1024 bits.






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






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






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






44. Verify whether the data has been altered.






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






46. 'is a block-cipher algorithm - which means that it performs operations on fixed-length data streams of 64-bit blocks. The key ostensibly consists of 64 bits; however - only 56 are actually used by the algorithm.'






47. '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.'






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






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






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







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