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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. A






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






3. 'Encryption - where Peer X uses Peer Y






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






5. 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.






6. Used in IPsec for two discreet purposes:






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






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






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






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






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






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






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






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






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






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






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






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






19. Provides authentication and encryption of the payload.






20. Key exchange for IPSEC






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






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






23. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.






24. '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.'






25. 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.






26. One of the most popular tunneling protocols is






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






28. Common key size is 1024 bits.






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






30. Verify whether the data has been altered.






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






32. Does not provide payload encryption.






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






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






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






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






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






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






39. '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






40. 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.






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






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






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






44. Uses protocol number 50.






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






46. IPSEC Encryption is performed by

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






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






49. Uses protocol number 51.






50. '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.'