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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. Invented by Ron Rivest of RSA Security (RFC 1321).
AH/ESP
'IPSEC (phase1 -step1)'
message authentication codes (MAC).
MD5
2. IPSEC tunnels data through IP using one of two protocols?
Difffie-Hellman
3DES
3DES
AH/ESP
3. '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.'
3DES
'IPSEC (phase1 -step1)'
Difffie-Hellman
DES
4. A variable block- length and key-length cipher.
Hashing
AES
HMAC
IPSEC BENEFIT
5. This mode does not support identity protection or protection against clogging attacks and spoofing.
3DES
MD5
SHA
IPSEC (aggressive mode)
6. Integrity checks are done
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7. 'Encryption - where Peer X uses Peer Y
RSA
Difffie-Hellman
ESP
3DES
8. Data integrity is the process of making sure data is not tampered with while it
AH/ESP
IKE
IPSEC BENEFIT
IPSEC (aggressive mode)
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.
IPSEC (phase2)
Asymetric Encryption Protocols
Tunnel Mode (ipsec)
IKE
10. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
3DES
IPSEC (aggressive mode)
Hashing
IPSEC BENEFIT
11. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
3DES
MD5
DSA
hash-based message authentication codes (HMAC).
12. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm
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13. It also provides protection for ISAKMP peer identities with encryption.
Hashing
AH/ESP
Difffie-Hellman
IPSEC (main mode)
14. Used in IPsec for two discreet purposes:
Hashing
MD5
RSA
DES
15. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
IPSEC (aggressive mode)
hash algorithms
Transport Mode (Ipsec)
Difffie-Hellman
16. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'
'DES - 3DES - or AES.'
IPSEC (phase2)
RSA
IPSEC (aggressive mode)
17. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
ESP
Difffie-Hellman
AH/ESP
IPSEC BENEFIT
18. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
DSA
3DES
AH/ESP
message authentication codes (MAC).
19. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
DES
'DES - 3DES - or AES.'
'IPSEC (phase1 -step2)'
Origin Auth (DH auth)
20. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
3DES
DSA
GRE
IPSEC (main mode)
21. 'provides everything required to securely connect over a public media - such as the Internet.'
IPSEC
DSA
AH
IPSEC (main mode)
22. 'MACs with hash algorithms -'
MD5
hash-based message authentication codes (HMAC).
Hashing
IKE
23. 'Finally - the receiving devices decrypt the data with the first key.'
3DES
AH/ESP
RSA
Difffie-Hellman
24. 'requires that the sender and receiver have key pairs. By combining the sender
Difffie-Hellman
IPSEC (aggressive mode)
Hashing
'IPSEC (phase1 -step1)'
25. Key exchange for IPSEC
RSA
AH
IKE
IPSEC (main mode)
26. The protocol of choice for key management and establishing security associations between peers on the Internet.
ISAKMP
ESP
'IPSEC (phase1 -step3)'
SHA
27. A
'IPSEC (phase1 -step2)'
IPSEC (phase2)
Hashing
3DES
28. '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.'
IPSEC (aggressive mode)
IPSEC BENEFIT
ISAKMP
DES
29. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
Difffie-Hellman
IPSEC (main mode)
HMAC-MD5/HMAC-SHA
IPSEC (aggressive mode)
30. IPsec implements using a shim header between L2 and L3
ISAKMP
AH/ESP
IKE
SHA
31. 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
Hashing
IPSEC (main mode)
32. No additional Layer 3 header is created. The original Layer 3 header is used.
Difffie-Hellman
Transport Mode (Ipsec)
Hashing
DES
33. IPSEC Encryption is performed by
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34. Common key size is 1024 bits.
Asymetric Encryption Protocols
RSA
HMAC
Difffie-Hellman
35. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
RSA
DSA
IPSEC (phase2)
Difffie-Hellman
36. Act of encapsulating a packet within another packet.
ESP
Tunneling
DSA
Antireplay
37. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
IPSEC (main mode)
IPSEC (aggressive mode)
IPSEC
hash algorithms
38. Provides authentication and encryption of the payload.
ESP
3DES
Tunneling
RSA
39. 'in most cases - this mode is preferred with certificates.'
IPSEC (phase2)
IPSEC BENEFIT
IPSEC (main mode)
3DES
40. '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.'
ISAKMP
DSA
Hashing
IKE
41. The receiving device then encrypts the data with the second key.
RSA
IKE
SHA
3DES
42. '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
Difffie-Hellman
RSA
Hashing
IPSEC BENEFIT
43. '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 - SHA-1 - or RSA'
SHA
AH/ESP
44. Used for integrity checks on peer and data sent by peer and for authentication checks.
AH
RSA/DSA
AH/ESP
IPSEC (phase2)
45. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
Difffie-Hellman
ESP
AH/ESP
IKE
46. Uses protocol number 50.
IPSEC
ESP
Difffie-Hellman
Difffie-Hellman
47. Uses protocol number 51.
RSA
IKE
AH
3DES
48. 'When using the hash-based key function -'
IKE
IPSEC (aggressive mode)
HMAC-MD5/HMAC-SHA
IKE
49. RFC 2631 on the workings of the key generation/exchange process.
IKE
RSA
Difffie-Hellman
Tunneling
50. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
Difffie-Hellman
IKE
SHA
Hashing