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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. '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.'
'MD5 - SHA-1 - or RSA'
AH
IPSEC (aggressive mode)
Difffie-Hellman
2. Common key size is 1024 bits.
DSA
ESP
AES
RSA
3. '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
hash-based message authentication codes (HMAC).
IPSEC (main mode)
AH
4. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
Antireplay
SHA
Difffie-Hellman
AH/ESP
5. 'The sending device decrypts the data with the second key - which is also 56 bits in length.'
AES
3DES
hash algorithms
RSA
6. 'in most cases - this mode is preferred with certificates.'
DES
IKE
Difffie-Hellman
IPSEC (main mode)
7. Act of encapsulating a packet within another packet.
3DES
Tunneling
message authentication codes (MAC).
Hashing
8. 'defines the mode of communication - creation - and management of security associations.'
ESP
RSA
Difffie-Hellman
ISAKMP
9. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'
IPSEC (aggressive mode)
RSA/DSA
Difffie-Hellman
RSA
10. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
Hashing
Tunnel Mode (ipsec)
RSA
Difffie-Hellman
11. 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.
Tunnel Mode (ipsec)
Asymetric Encryption Protocols
'DES - 3DES - or AES.'
MD5
12. Integrity checks are done
13. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
DES
3DES
IPSEC (aggressive mode)
Hashing
14. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
IKE
AES
3DES
SHA
15. '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
Antireplay
RSA
3DES
16. The sending device encrypts for a final time with another 56-bit key.
'IPSEC (phase1 -step2)'
3DES
Transport Mode (Ipsec)
Origin Auth (DH auth)
17. Uses IKE for key exchange.
DES
3DES
ISAKMP
IKE
18. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
GRE
3DES
Origin Auth (DH auth)
AH/ESP
19. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
IPSEC (main mode)
Difffie-Hellman
Difffie-Hellman
Difffie-Hellman
20. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
RSA/DSA
AH/ESP
IPSEC (main mode)
AES
21. 'A 56-bit encryption algorithm - meaning the number of possible keys
ISAKMP
HMAC
Hashing
DES
22. Uses protocol number 51.
AH
AH/ESP
IPSEC (main mode)
3DES
23. 'Finally - the receiving devices decrypt the data with the first key.'
Hashing
RSA/DSA
3DES
SHA
24. 'Encryption - where Peer X uses Peer Y
RSA
Hashing
3DES
Difffie-Hellman
25. Verify whether the data has been altered.
HMAC
Difffie-Hellman
Antireplay
Hashing
26. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
3DES
3DES
IPSEC (aggressive mode)
ESP
27. Used in IPsec for two discreet purposes:
DES
RSA
'MD5 - SHA-1 - or RSA'
AH
28. It uses UDP 500 and is defined by RFC 2409.
HMAC
ESP
IKE
IPSEC (aggressive mode)
29. 'provides everything required to securely connect over a public media - such as the Internet.'
MD5
IKE
Hashing
IPSEC
30. Key exchange for IPSEC
AES
3DES
IKE
ESP
31. RFC 2631 on the workings of the key generation/exchange process.
'MD5 - SHA-1 - or RSA'
HMAC
DES
Difffie-Hellman
32. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm
33. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
Difffie-Hellman
Origin Auth (DH auth)
Difffie-Hellman
MD5
34. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
IPSEC (aggressive mode)
DES
ESP
IPSEC (main mode)
35. Used for integrity checks on peer and data sent by peer and for authentication checks.
AH
ISAKMP
Transport Mode (Ipsec)
IKE
36. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
37. Does not provide payload encryption.
ISAKMP
Difffie-Hellman
AH
Transport Mode (Ipsec)
38. Uses protocol number 50.
ISAKMP
ESP
AES
HMAC-MD5/HMAC-SHA
39. 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.
3DES
Hashing
IPSEC (main mode)
Asymetric Encryption Protocols
40. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
ESP
IPSEC BENEFIT
RSA
IPSEC (aggressive mode)
41. 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.
AES
Difffie-Hellman
IKE
DSA
42. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
IKE
GRE
MD5
IPSEC (aggressive mode)
43. DoS attacks are more probable with this mode.
IPSEC (aggressive mode)
Difffie-Hellman
IPSEC (main mode)
ESP
44. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
45. A variable block- length and key-length cipher.
DSA
AES
Antireplay
AH/ESP
46. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
IPSEC (aggressive mode)
'IPSEC (phase1 -step1)'
DSA
3DES
47. More CPU intensive
IPSEC (main mode)
SHA
ISAKMP
Difffie-Hellman
48. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
IPSEC (aggressive mode)
ESP
RSA
AES
49. Data integrity is the process of making sure data is not tampered with while it
MD5
IPSEC (main mode)
IPSEC BENEFIT
'IPSEC (phase1 -step3)'
50. Has a trailer which identifies IPsec information and ESP integrity-check information.
IKE
ESP
IPSEC (aggressive mode)
DSA