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






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






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

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4. 'MACs with hash algorithms -'






5. 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.






6. Verify whether the data has been altered.






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






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






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






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






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






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






13. Common key size is 1024 bits.






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






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






16. Does not provide payload encryption.






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






18. '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.'






19. 'Encryption - where Peer X uses Peer Y






20. Act of encapsulating a packet within another packet.






21. '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






22. The DES algorithm that performs 3 times sequentially.






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






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






26. One of the most popular tunneling protocols is






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






28. Used in IPsec for two discreet purposes:






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






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






31. More CPU intensive






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






33. Provides authentication and encryption of the payload.






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






35. Integrity checks are done

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36. '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.'






37. A






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






39. Uses protocol number 51.






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






41. 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.






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






43. Key exchange for IPSEC






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






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






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






47. '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






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






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






50. '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.'







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