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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. IPsec implements using a shim header between L2 and L3






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






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






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






5. Act of encapsulating a packet within another packet.






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






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






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

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






10. '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






11. More CPU intensive






12. The DES algorithm that performs 3 times sequentially.






13. A






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






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






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






17. '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.'






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






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






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






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






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






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






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






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






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






27. '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.'






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






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






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






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






32. Used in IPsec for two discreet purposes:






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






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






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






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






37. Verify whether the data has been altered.






38. Common key size is 1024 bits.






39. Integrity checks are done

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40. '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.'






41. '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.'






42. Uses protocol number 50.






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






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






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






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






47. '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.'






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

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49. '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






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







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