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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. 'Encryption - where Peer X uses Peer Y






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






3. '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.'






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






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






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






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






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






9. 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.






10. IPSEC Encryption is performed by

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

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12. Verify whether the data has been altered.






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






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






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






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






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

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






19. Act of encapsulating a packet within another packet.






20. More CPU intensive






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






22. Common key size is 1024 bits.






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






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






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






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






27. '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






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






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






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






31. Key exchange for IPSEC






32. A






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






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






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






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






37. 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.






38. Does not provide payload encryption.






39. '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.'






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






41. 'MACs with hash algorithms -'






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






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






44. '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.'






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






46. '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






47. DoS attacks are more probable with this mode.






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






49. One of the most popular tunneling protocols is






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.'