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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. Act of encapsulating a packet within another packet.






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






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






4. '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.'






5. Uses IKE for key exchange.






6. Uses protocol number 51.






7. Does not provide payload encryption.






8. Key exchange for IPSEC






9. The DES algorithm that performs 3 times sequentially.






10. Common key size is 1024 bits.






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






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






13. Uses protocol number 50.






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






15. Verify whether the data has been altered.






16. 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.






17. DoS attacks are more probable with this mode.






18. '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.'






19. One of the most popular tunneling protocols is






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






21. 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.






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

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






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






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






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






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






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






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






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






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






33. '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.'






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






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






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






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






38. '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.'






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






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






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






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






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






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

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






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






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






48. 'MACs with hash algorithms -'






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






50. Integrity checks are done

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