Which is a more secure way to use preshared keys between multiple peers

1. (TCO 6) Which is a more secure way to use preshared keys between multiple peers? (Points : 4) Specify the same key to share with multiple remote peers.
Specify different keys for related groups of remote peers.
Specify a different key for every remote peer connection.
Use the hostname of the remote router as a preshared key value.

Question 2. 2. (TCO 6) The default lifetime of an ISAKMP security association (SA) is _____. (Points : 4)

12 hours
24 hours
48 hours
72 hours

Question 3. 3. (TCO 6) The Cisco IOS firewall crypto isakmp policy mode command that will set the data integrity algorithm to MD5 is _____. (Points : 4)

integrity md5
set hash md5
hash md5
set integrity md5

Question 4. 4. (TCO 6) _____ encryption algorithms use the same key to encrypt and decrypt data between the sender and recipient. (Points : 4)

Symmetric
Asymmetric
Balanced
Single token

Question 5. 5. (TCO 6) The _____ encryption algorithm uses a key size of 128, 192, and 256 bits. (Points : 4)

DES
3DES
AES
WEP

Question 6. 6. (TCO 6) Which of the following algorithms is used to securely exchange IKE policy information? (Points : 4)

Diffie-Hellman
RSA signatures
Preshared keys
MD5