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QUESTION 81
Regarding constructing a good encryption algorithm, what does creating an avalanche effect indicate?
A. Changing only a few bits of a plain-text message causes the ciphertext to be completely different. PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 640-553
B. Changing only a few bits of a ciphertext message causes the plain text to be completely different.
C. Altering the key length causes the plain text to be completely different.
D. Altering the key length causes the ciphertext to be completely different.
Correct Answer: A QUESTION 82
Which one of the aaa accounting commands can be used to enable logging of both the start and stop records for user terminal sessions on the router?
A. aaa accounting connection start-stop tacacs+
B. aaa accounting network start-stop tacacs+
C. aaa accounting exec start-stop tacacs+
D. aaa accounting system start-stop tacacs+ Correct Answer: C
QUESTION 83
Stream ciphers run on which of the following?
A. Individual blocks, one at a time, with the transformations varying during the encryption
B. Individual digits, one at a time, with the transformations varying during the encryption
C. Fixed-length groups of digits called blocks
D. Fixed-length groups of bits called blocks
Correct Answer: B QUESTION 84
Which description is correct based on the exhibit and partial configuration?
PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 640-553
A. All traffic from network 10.0.0.0 will be permitted.
B. This ACL will prevent any host on the Internet from spoofing the inside network address as the source address for packets coming into the router from the Internet.
C. Access-list 101 will prevent address spoofing from interface E0.
D. All traffic destined for network 172.16.150.0 will be denied due to the implicit deny all.
Correct Answer: C
QUESTION 85
Which description is true about ECB mode?
A. ECB mode uses the same 64-bit key to serially encrypt each 56-bit plain-text block.
B. In ECB mode, each 56-bit plain-text block is exclusive ORed (XORed) bitwise with the previous ciphertext block.
C. ECB mode uses the same 56-bit key to serially encrypt each 64-bit plain-text block.
D. In ECB mode, each 64-bit plain-text block is exclusive ORed (XORed) bitwise with the previous ciphertext block.
Correct Answer: C QUESTION 86
For the following items ,which one can be used to authenticate the IPsec peers during IKE Phase 1?
A. XAUTH
B. pre-shared key PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 640-553
C. integrity check value
D. Diffie-Hellman Nonce
Correct Answer: B QUESTION 87
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?
A. Roughly 66 percent
B. Roughly 10 percent
C. Roughly 75 percent
D. Roughly 50 percent
Correct Answer: D QUESTION 88
What will be disabled as a result of the no service password-recovery command?
A. password encryption service
B. ROMMON
C. changes to the config-register setting
D. the xmodem privilege EXEC mode command to recover the Cisco IOS image
Correct Answer: B QUESTION 89
Which example is of a function intended for cryptographic hashing?
A. SHA-135
B. MD65
C. XR12
D. MD5
Correct Answer: D QUESTION 90
Which one of the following items may be added to a password stored in MD5 to make it more secure?
A. Rainbow table
B. Cryptotext
C. Ciphertext
D. Salt
Correct Answer: D QUESTION 91
What is the MD5 algorithm used for?
A. takes a variable-length message and produces a 168-bit message digest
B. takes a fixed-length message and produces a 128-bit message digest
C. takes a variable-length message and produces a 128-bit message digest
D. takes a message less than 2^64 bits as input and produces a 160-bit message digest
Correct Answer: C QUESTION 92
Which algorithm was the first to be found suitable for both digital signing and encryption?
A. SHA-1
B. MD5
C. HMAC
D. RSA
Correct Answer: D QUESTION 93
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?
A. 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
B. 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
C. access-list 101 permit tcp host 192.168.1.10 eq 80 10.1.0.0 0.0.255.255 eq 3030
D. access-list 101 permit tcp any eq 3030
Correct Answer: B QUESTION 94
Observe the following options carefully, which two attacks focus on RSA? (Choose all that apply.)
A. DDoS attack
B. BPA attack
C. Adaptive chosen ciphertext attack
D. Man-in-the-middle attack
Correct Answer: BC QUESTION 95
A standard access control list has been configured on a router and applied to interface Serial 0 in an outbound direction. No ACL is applied to Interface Serial 1 on the same router. What will happen when traffic being filtered
PassGuide.com-Make You Succeed To Pass IT Exams PassGuide 640-553
by the access list does not match the configured ACL statements for Serial 0?
A. The source IP address is checked, and, if a match is not found, traffic is routed out interface Serial 1.
B. The resulting action is determined by the destination IP address.
C. The resulting action is determined by the destination IP address and port number.
D. The traffic is dropped.
Correct Answer: D
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