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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. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
IPSEC (main mode)
Difffie-Hellman
DES
3DES
2. Uses protocol number 51.
ISAKMP
AH
IKE
3DES
3. '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.'
3DES
AH/ESP
Hashing
3DES
4. 'defines the mode of communication - creation - and management of security associations.'
IKE
AES
AH
ISAKMP
5. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
Difffie-Hellman
3DES
Asymetric Encryption Protocols
IPSEC BENEFIT
6. '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.'
Difffie-Hellman
RSA/DSA
RSA
3DES
7. Used for integrity checks on peer and data sent by peer and for authentication checks.
hash algorithms
AH
'IPSEC (phase1 -step3)'
Difffie-Hellman
8. Integrity checks are done
9. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
10. Uses IKE for key exchange.
MD5
ISAKMP
Origin Auth (DH auth)
IPSEC (aggressive mode)
11. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
IKE
3DES
DSA
RSA
12. IPSec SAs are negotiated and protected by the existing IPsec SA.
RSA
SHA
IPSEC (phase2)
DES
13. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
Antireplay
Difffie-Hellman
3DES
SHA
14. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
message authentication codes (MAC).
3DES
Difffie-Hellman
SHA
15. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
ISAKMP
IPSEC (aggressive mode)
AH/ESP
IKE
16. No additional Layer 3 header is created. The original Layer 3 header is used.
Transport Mode (Ipsec)
IKE
IPSEC (main mode)
DSA
17. 'A 56-bit encryption algorithm - meaning the number of possible keys
IPSEC BENEFIT
Hashing
RSA
DES
18. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
RSA
IPSEC (aggressive mode)
IKE
3DES
19. 'requires that the sender and receiver have key pairs. By combining the sender
DSA
message authentication codes (MAC).
Difffie-Hellman
'DES - 3DES - or AES.'
20. Does not provide payload encryption.
Origin Auth (DH auth)
IKE
ISAKMP
AH
21. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
'MD5 - SHA-1 - or RSA'
IPSEC (aggressive mode)
DSA
hash-based message authentication codes (HMAC).
22. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
3DES
RSA
IKE
HMAC
23. '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
Asymetric Encryption Protocols
hash-based message authentication codes (HMAC).
IKE
hash algorithms
24. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
IKE
DSA
AH
AH/ESP
25. Data integrity is the process of making sure data is not tampered with while it
Antireplay
Hashing
IPSEC BENEFIT
DES
26. Uses protocol number 50.
IKE
ESP
IPSEC (aggressive mode)
Hashing
27. 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.
IPSEC (aggressive mode)
3DES
Tunnel Mode (ipsec)
DES
28. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
DES
IKE
GRE
Difffie-Hellman
29. It also provides protection for ISAKMP peer identities with encryption.
IPSEC BENEFIT
Difffie-Hellman
IPSEC (main mode)
IPSEC (aggressive mode)
30. 'provides everything required to securely connect over a public media - such as the Internet.'
IPSEC
Asymetric Encryption Protocols
RSA
'IPSEC (phase1 -step1)'
31. ' is defined in RFC 3174. has as output a 160-bit value -'
DSA
Difffie-Hellman
SHA
IPSEC (aggressive mode)
32. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
MD5
IPSEC
'IPSEC (phase1 -step2)'
Asymetric Encryption Protocols
33. '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
3DES
DES
Difffie-Hellman
RSA
34. IPSEC tunnels data through IP using one of two protocols?
AH/ESP
IKE
SHA
IPSEC (phase2)
35. The receiving device then encrypts the data with the second key.
IPSEC
Hashing
3DES
SHA
36. Used in IPsec for two discreet purposes:
Difffie-Hellman
RSA
Difffie-Hellman
Difffie-Hellman
37. The sending device encrypts for a final time with another 56-bit key.
Antireplay
IKE
3DES
Difffie-Hellman
38. IPSEC Encryption is performed by
39. Act of encapsulating a packet within another packet.
AES
Tunneling
message authentication codes (MAC).
RSA
40. Uses the D-H algorithm to come to agreement over a public network.
IKE
AES
DSA
ISAKMP
41. A variable block- length and key-length cipher.
3DES
AES
3DES
IKE
42. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
IPSEC BENEFIT
IKE
AES
AH/ESP
43. Invented by Ron Rivest of RSA Security (RFC 1321).
IPSEC (aggressive mode)
3DES
Hashing
MD5
44. RFC 2631 on the workings of the key generation/exchange process.
MD5
Difffie-Hellman
IPSEC (phase2)
'DES - 3DES - or AES.'
45. More CPU intensive
SHA
MD5
Difffie-Hellman
AH
46. Provides authentication and encryption of the payload.
Difffie-Hellman
'IPSEC (phase1 -step2)'
AES
ESP
47. Key exchange for IPSEC
DSA
IKE
DES
Hashing
48. It uses UDP 500 and is defined by RFC 2409.
ESP
IKE
ISAKMP
'IPSEC (phase1 -step2)'
49. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
SHA
3DES
Difffie-Hellman
IPSEC
50. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
'MD5 - SHA-1 - or RSA'
RSA
IPSEC (main mode)
'DES - 3DES - or AES.'