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






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






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






4. 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.






5. 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.






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






7. '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.'






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






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






10. Does not provide payload encryption.






11. Provides authentication and encryption of the payload.






12. Act of encapsulating a packet within another packet.






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






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






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






16. Uses protocol number 50.






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






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






19. 'is a more secure version of MD5 - and hash-based message authentication codes (HMAC) provides further security with the inclusion of a key-based hash.'






20. DoS attacks are more probable with this mode.






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






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






23. '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






24. The sending device encrypts for a final time with another 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. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'






27. Uses IKE for key exchange.






28. '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.'






29. Integrity checks are done

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30. 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.






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






32. A






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






34. Key exchange for IPSEC






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






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






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






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






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






40. '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






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






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






43. Uses protocol number 51.






44. 'Encryption - where Peer X uses Peer Y






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






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






47. Common key size is 1024 bits.






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






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






50. The DES algorithm that performs 3 times sequentially.