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Test your basic knowledge |
CCIE Sec Encryption Ipsec
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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. That authenticate data packets and ensure that data is not tampered with or modified.
IPSEC (aggressive mode)
Hashing
3DES
hash algorithms
2. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
IKE
Hashing
IPSEC (main mode)
GRE
3. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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4. 'MACs with hash algorithms -'
IPSEC (aggressive mode)
DES
'IPSEC (phase1 -step3)'
hash-based message authentication codes (HMAC).
5. 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.
Asymetric Encryption Protocols
RSA
ISAKMP
MD5
6. Verify whether the data has been altered.
DES
AH
Hashing
3DES
7. A variable block- length and key-length cipher.
IPSEC
AES
IPSEC (aggressive mode)
Difffie-Hellman
8. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'
Difffie-Hellman
Origin Auth (DH auth)
RSA/DSA
IKE
9. Used in government installs and was created to work with the SHA-1 hash algorithm.
3DES
ISAKMP
DSA
IPSEC (main mode)
10. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
AES
SHA
Asymetric Encryption Protocols
RSA
11. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
IKE
AES
Difffie-Hellman
RSA
12. IPSec SAs are negotiated and protected by the existing IPsec SA.
IPSEC (phase2)
RSA
ISAKMP
ISAKMP
13. Common key size is 1024 bits.
Tunnel Mode (ipsec)
RSA
message authentication codes (MAC).
IKE
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).
AES
3DES
DSA
15. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
3DES
ISAKMP
IPSEC (aggressive mode)
Tunnel Mode (ipsec)
16. Does not provide payload encryption.
AH
SHA
DSA
IPSEC (aggressive mode)
17. 'in most cases - this mode is preferred with certificates.'
3DES
AH/ESP
IPSEC (main mode)
Difffie-Hellman
18. '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.'
ESP
Difffie-Hellman
3DES
Hashing
19. 'Encryption - where Peer X uses Peer Y
ISAKMP
ISAKMP
'IPSEC (phase1 -step3)'
RSA
20. Act of encapsulating a packet within another packet.
IKE
MD5
Tunneling
Difffie-Hellman
21. '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
Hashing
RSA
message authentication codes (MAC).
Difffie-Hellman
22. The DES algorithm that performs 3 times sequentially.
3DES
MD5
'IPSEC (phase1 -step3)'
'IPSEC (phase1 -step1)'
23. '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.'
RSA
Transport Mode (Ipsec)
IPSEC (main mode)
3DES
24. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
HMAC-MD5/HMAC-SHA
3DES
AH/ESP
SHA
25. 'A 56-bit encryption algorithm - meaning the number of possible keys
RSA
DES
AH
'MD5 - SHA-1 - or RSA'
26. One of the most popular tunneling protocols is
GRE
Hashing
Difffie-Hellman
RSA
27. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
Transport Mode (Ipsec)
AES
ISAKMP
AH
28. Used in IPsec for two discreet purposes:
ISAKMP
RSA
Difffie-Hellman
Transport Mode (Ipsec)
29. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
Difffie-Hellman
AES
IKE
DSA
30. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
Antireplay
ESP
'MD5 - SHA-1 - or RSA'
IKE
31. More CPU intensive
Tunnel Mode (ipsec)
DES
IPSEC BENEFIT
SHA
32. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
DSA
Asymetric Encryption Protocols
3DES
GRE
33. Provides authentication and encryption of the payload.
IPSEC BENEFIT
3DES
3DES
ESP
34. The receiving device decrypts the data with the third key.
3DES
Hashing
hash algorithms
IPSEC (aggressive mode)
35. Integrity checks are done
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36. '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.'
Difffie-Hellman
Difffie-Hellman
RSA
DSA
37. A
ESP
SHA
AES
Hashing
38. Main disadvantage of asymmetric algorithms is that they are slow.
ESP
RSA/DSA
RSA
RSA
39. Uses protocol number 51.
Hashing
RSA
DES
AH
40. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
IPSEC (main mode)
IKE
'IPSEC (phase1 -step2)'
Tunnel Mode (ipsec)
41. 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
DSA
ESP
Tunnel Mode (ipsec)
42. Uses the D-H algorithm to come to agreement over a public network.
Hashing
GRE
MD5
IKE
43. Key exchange for IPSEC
Asymetric Encryption Protocols
IKE
RSA
'DES - 3DES - or AES.'
44. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
MD5
AES
RSA
Hashing
45. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
IPSEC (aggressive mode)
'MD5 - SHA-1 - or RSA'
DSA
IPSEC BENEFIT
46. 'defines the mode of communication - creation - and management of security associations.'
ISAKMP
HMAC
3DES
ESP
47. '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
hash algorithms
RSA/DSA
Asymetric Encryption Protocols
AES
48. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
Hashing
AH
IKE
IPSEC (aggressive mode)
49. This mode does not support identity protection or protection against clogging attacks and spoofing.
IPSEC BENEFIT
AH
IKE
IPSEC (aggressive mode)
50. '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.'
Difffie-Hellman
IKE
MD5
Hashing
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