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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. '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.'






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






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






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






5. DoS attacks are more probable with this mode.






6. Used in IPsec for two discreet purposes:






7. Does not provide payload encryption.






8. Invented by Ron Rivest of RSA Security (RFC 1321).






9. Key exchange for IPSEC






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






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






12. Provides authentication and encryption of the payload.






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






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






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






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






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






18. More CPU intensive






19. '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.'






20. '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.'






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






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






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






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






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






26. Act of encapsulating a packet within another packet.






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






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

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29. Common key size is 1024 bits.






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






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






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






33. Verify whether the data has been altered.






34. '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






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. 'MACs with hash algorithms -'






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






38. 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.






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






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






41. One of the most popular tunneling protocols is






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






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

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






45. 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.






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






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






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






49. '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.'






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