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






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






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






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. Common key size is 1024 bits.






6. 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.






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






8. '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.'






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






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






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






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






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






14. '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.'






15. A






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






17. The DES algorithm that performs 3 times sequentially.






18. '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.'






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






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






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






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






23. 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.






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

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






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






27. Key exchange for IPSEC






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






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

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30. Provides authentication and encryption of the payload.






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






32. Uses protocol number 51.






33. Verify whether the data has been altered.






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






35. 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.






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






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






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






39. IPSEC Encryption is performed by

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






41. '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






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






43. DoS attacks are more probable with this mode.






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






45. Uses IKE for key exchange.






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






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






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






49. Uses protocol number 50.






50. '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







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