Cisco-IINS Implementing Cisco IOS Network Security Set 3

1.

Stream ciphers run on which of the following?

Individual blocks, one at a time, with the transformations varying during the encryption Individual digits, one at a time, with the transformations varying during the encryption Fixed-length groups of digits called blocks Fixed-length groups of bits called blocks

2.

Which description is true about ECB mode?

ECB mode uses the same 64-bit key to serially encrypt each 56-bit plain-text block. In ECB mode, each 56-bit plain-text block is exclusive ORed (XORed) bitwise with the previous ciphertextblock. ECB mode uses the same 56-bit key to serially encrypt each 64-bit plain-text block. In ECB mode, each 64-bit plain-text block is exclusive ORed (XORed) bitwise with the previous ciphertextblock.

3.

For the following items ,which one can be used to authenticate the IPsec peers during IKE Phase 1?

XAUTH pre-shared key integrity check value Diffie-Hellman Nonce

4.

In a brute-force attack, what percentage of the keyspace must an attacker generally search through until he or she finds the key that decrypts the data?

Roughly 66 percent Roughly 10 percent Roughly 75 percent Roughly 50 percent

5.

What will be disabled as a result of the no service password-recovery command?

password encryption service ROMMON changes to the config-register setting the xmodem privilege EXEC mode command to recover the Cisco IOS image

6.

Which example is of a function intended for cryptographic hashing?

SHA-135 MD65 XR12 MD5

7.

Which one of the following items may be added to a password stored in MD5 to make it more secure?

Rainbow table Cryptotext Ciphertext Salt

8.

What is the MD5 algorithm used for?

takes a variable-length message and produces a 168-bit message digest takes a fixed-length message and produces a 128-bit message digest takes a variable-length message and produces a 128-bit message digest takes a message less than 2^64 bits as input and produces a 160-bit message digest

9.

Which algorithm was the first to be found suitable for both digital signing and encryption?

SHA-1 MD5 HMAC RSA

10.

Examine the following options, which access list will permit HTTP traffic sourced from host 10.1.129.100 port 3030 destined to host 192.168.1.10?

access-list 101 permit tcp 10.1.129.0 0.0.0.255 eq www 192.168.1.10 0.0.0.0 eq www access-list 101 permit tcp 10.1.128.0 0.0.1.255 eq 3030 192.168.1.0 0.0.0.15 eq www access-list 101 permit tcp host 192.168.1.10 eq 80 10.1.0.0 0.0.255.255 eq 3030 access-list 101 permit tcp any eq 3030

Cisco-IINS Implementing Cisco IOS Network Security Set 3

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Cisco-IINS Implementing Cisco IOS Network Security Set 3

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