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






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






3. '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.'






4. Provides authentication and encryption of the payload.






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






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






7. More CPU intensive






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






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






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






11. '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.'






12. '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






13. 'MACs with hash algorithms -'






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






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






16. One of the most popular tunneling protocols is






17. A






18. IPSEC Encryption is performed by

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

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






21. 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.






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






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






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






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






26. DoS attacks are more probable with this mode.






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






28. 'Encryption - where Peer X uses Peer Y






29. '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.'






30. '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






31. '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.'






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






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






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






35. Does not provide payload encryption.






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






37. The receiving device decrypts the data with the third key.






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






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






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






41. 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.






42. Used in IPsec for two discreet purposes:






43. '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.'






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






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






46. 'requires that the sender and receiver have key pairs. By combining the sender






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






48. 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.






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






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