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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. '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.'






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






3. The DES algorithm that performs 3 times sequentially.






4. Uses protocol number 50.






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






6. Integrity checks are done

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






8. 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.






9. IPSEC Encryption is performed by

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






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






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






13. '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






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






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






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






17. 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.






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






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

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






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






22. 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.






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






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






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






26. '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.'






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






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






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






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






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






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






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






34. Used in IPsec for two discreet purposes:






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






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






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






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






39. More CPU intensive






40. Common key size is 1024 bits.






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






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






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






44. Uses protocol number 51.






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






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






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






48. 'Encryption - where Peer X uses Peer Y






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