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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. '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.'






2. '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.'






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






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






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






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






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






8. 'Encryption - where Peer X uses Peer Y






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






10. 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.






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






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






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






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






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






16. Provides authentication and encryption of the payload.






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






18. Used in IPsec for two discreet purposes:






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






20. Verify whether the data has been altered.






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






22. Common key size is 1024 bits.






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






25. 'MACs with hash algorithms -'






26. '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






27. Integrity checks are done

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






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






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






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






32. Does not provide payload encryption.






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






34. 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.






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






36. Uses protocol number 50.






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






38. More CPU intensive






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

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






41. Act of encapsulating a packet within another packet.






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






43. '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






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






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






46. '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.'






47. Uses protocol number 51.






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






49. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits

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