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Test your basic knowledge |
CCIE Sec Encryption Ipsec
Start Test
Study First
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. The receiving device then encrypts the data with the second key.
ESP
3DES
Hashing
'IPSEC (phase1 -step2)'
2. 'MACs with hash algorithms -'
hash-based message authentication codes (HMAC).
AH
Difffie-Hellman
IPSEC (main mode)
3. 'Finally - the receiving devices decrypt the data with the first key.'
IPSEC (main mode)
3DES
IKE
SHA
4. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
3DES
RSA/DSA
Antireplay
MD5
5. Used for integrity checks on peer and data sent by peer and for authentication checks.
IKE
AH
3DES
Asymetric Encryption Protocols
6. Has a trailer which identifies IPsec information and ESP integrity-check information.
ESP
RSA
AH
SHA
7. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
RSA
'IPSEC (phase1 -step1)'
IPSEC BENEFIT
AH
8. Uses IKE for key exchange.
Tunnel Mode (ipsec)
DES
ISAKMP
Difffie-Hellman
9. 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.
3DES
IPSEC BENEFIT
IPSEC (aggressive mode)
Tunnel Mode (ipsec)
10. One of the most popular tunneling protocols is
3DES
Difffie-Hellman
RSA
GRE
11. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
AH
AH
DES
3DES
12. Provides authentication and encryption of the payload.
Origin Auth (DH auth)
HMAC
3DES
ESP
13. '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
Tunneling
Antireplay
RSA
AH/ESP
14. Act of encapsulating a packet within another packet.
3DES
ESP
Tunneling
ISAKMP
15. '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
IPSEC (main mode)
HMAC-MD5/HMAC-SHA
Asymetric Encryption Protocols
SHA
16. Provide authentication in Internet Key Exchange (IKE) Phase 2.
MD5
ESP
HMAC
RSA
17. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'
AH
AH/ESP
IKE
Asymetric Encryption Protocols
18. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
ISAKMP
AH
'IPSEC (phase1 -step1)'
AES
19. This mode does not support identity protection or protection against clogging attacks and spoofing.
SHA
message authentication codes (MAC).
IKE
IPSEC (aggressive mode)
20. IPSEC tunnels data through IP using one of two protocols?
AH/ESP
IPSEC BENEFIT
IPSEC (aggressive mode)
RSA/DSA
21. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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22. Used in government installs and was created to work with the SHA-1 hash algorithm.
Difffie-Hellman
Hashing
DSA
SHA
23. 'Encryption - where Peer X uses Peer Y
RSA
IPSEC (aggressive mode)
IPSEC BENEFIT
IKE
24. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
ESP
ISAKMP
SHA
DES
25. 'requires that the sender and receiver have key pairs. By combining the sender
AH/ESP
'IPSEC (phase1 -step3)'
Difffie-Hellman
IPSEC (aggressive mode)
26. More CPU intensive
IKE
3DES
Tunneling
SHA
27. IPSec SAs are negotiated and protected by the existing IPsec SA.
AES
IPSEC (aggressive mode)
IPSEC (phase2)
Difffie-Hellman
28. It also provides protection for ISAKMP peer identities with encryption.
IPSEC (main mode)
3DES
'IPSEC (phase1 -step3)'
AH
29. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
IPSEC (aggressive mode)
DES
message authentication codes (MAC).
Asymetric Encryption Protocols
30. No additional Layer 3 header is created. The original Layer 3 header is used.
DES
Transport Mode (Ipsec)
AH
IPSEC (aggressive mode)
31. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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32. '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.'
DSA
ISAKMP
ESP
AES
33. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
DSA
IKE
AH
Difffie-Hellman
34. Data integrity is the process of making sure data is not tampered with while it
Difffie-Hellman
GRE
IPSEC BENEFIT
AH/ESP
35. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
AH/ESP
Difffie-Hellman
IPSEC (main mode)
Hashing
36. 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.
SHA
Asymetric Encryption Protocols
Tunnel Mode (ipsec)
IPSEC (phase2)
37. Main disadvantage of asymmetric algorithms is that they are slow.
RSA/DSA
3DES
IPSEC (main mode)
IPSEC (aggressive mode)
38. 'provides everything required to securely connect over a public media - such as the Internet.'
3DES
IPSEC
Difffie-Hellman
Antireplay
39. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
IKE
AH
AH
IPSEC (main mode)
40. IPSEC Encryption is performed by
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41. 'defines the mode of communication - creation - and management of security associations.'
ISAKMP
3DES
MD5
MD5
42. 'The sending device decrypts the data with the second key - which is also 56 bits in length.'
3DES
RSA
hash algorithms
IPSEC (aggressive mode)
43. That authenticate data packets and ensure that data is not tampered with or modified.
Asymetric Encryption Protocols
Difffie-Hellman
Tunnel Mode (ipsec)
hash algorithms
44. 'When using the hash-based key function -'
3DES
MD5
Asymetric Encryption Protocols
HMAC-MD5/HMAC-SHA
45. '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.'
3DES
MD5
hash-based message authentication codes (HMAC).
Origin Auth (DH auth)
46. Key exchange for IPSEC
RSA
Hashing
AES
IKE
47. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
IPSEC (aggressive mode)
IKE
Origin Auth (DH auth)
AES
48. Used in IPsec for two discreet purposes:
'DES - 3DES - or AES.'
SHA
GRE
RSA
49. '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.'
DES
IPSEC BENEFIT
HMAC
Difffie-Hellman
50. A
Hashing
SHA
Origin Auth (DH auth)
DSA