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NEW QUESTION: 1
When LLQ is being configured, which IOS command is used to limit the traffic rate on the priority queue even when the other class queues are not congested?
A. police
B. priority
C. queue-limit
D. bandwidth
E. hold-queue
Answer: A
Explanation:
bandwidth - Allows for the configuration of CBWFQ. The specifics of CBWFQ operation are beyond the scope of this explanation, but this command provides a minimum bandwidth guarantee to this class of traffic. fair-queue - Not available in all classes. This command enables Flow-based Weighted Fair Queuing within this class. police - Allows for the configuration of a policer, also known as rate limiting . The police command, when used within a class, is called class-based policing. priority - Designates that this class is a Low Latency Queuing (LLQ) class, which should receive strict scheduling priority to minimize delay, jitter and packet loss. Also specifies the amount of bandwidth for this class. queue-limit - Designates the maximum number of packets that can be in this queue. random-detect - Enables Weighted Random Early Detection (WRED) for congestion avoidance. By default, IP precedence is used for weight determination, but additional options within this command allow for the WRED algorithm to look at the DSCP. This command also provides an option for enabling explicit congestion notification (ECN) on this class. service-policy - Allows for the configuration of hierarchical policies (policy within a policy), which may be used to achieve functionality not possible in a single policy. For example, a T1 can be shaped to 512 kbps via a top-level policy, and then that 512 kbps can be divided (using CBWFQ/LLQ) within a second-level policy. Top-level policies are
NEW QUESTION: 2
Refer to the exhibit.
Users report that IP addresses cannot be acquired from the DHCP server. The DHCP server is configured as shown. About 300 total nonconcurrent users are using this DHCP server, but none of them are active for more than two hours per day. Which action fixes the issue within the current resources?
A. Configure the DHCP lease time to a smaller value
B. Add the network 192.168.2.0 255.255.255.0 command to the DHCP pool
C. Configure the DHCP lease time to a bigger value
D. Modify the subnet mask to the network 192.168.1.0 255.255.254.0 command in the DHCP pool
Answer: A
NEW QUESTION: 3
The backups server connects to a NAS device using block-level storage over Ethernet. The performance is very slow, however, and the network technician suspects the performance issues are network related.
Which of the following should the technician do to improve performance?
A. Enable jumbo frames on the NAS and server
B. Encapsulate the storage traffic in a GRE tunnel
C. Utilize UDP to eliminate packet overhead
D. Turn off MDIX settings on the NAS and server switchports
Answer: A
NEW QUESTION: 4
Which of the following answers is described as a random value used in cryptographic algorithms to ensure that patterns are not created during the encryption process?
A. IV - Initialization Vector
B. Stream Cipher
C. OTP - One Time Pad
D. Ciphertext
Answer: A
Explanation:
The basic power in cryptography is randomness. This uncertainty is why encrypted data is unusable to someone without the key to decrypt.
Initialization Vectors are a used with encryption keys to add an extra layer of randomness to encrypted data. If no IV is used the attacker can possibly break the keyspace because of patterns resulting in the encryption process. Implementation such as DES in Code Book Mode (CBC) would allow frequency analysis attack to take place.
In cryptography, an initialization vector (IV) or starting variable (SV)is a fixed-size input to a cryptographic primitive that is typically required to be random or pseudorandom.
Randomization is crucial for encryption schemes to achieve semantic security, a property
whereby repeated usage of the scheme under the same key does not allow an attacker to
infer relationships between segments of the encrypted message. For block ciphers, the use
of an IV is described by so-called modes of operation. Randomization is also required for
other primitives, such as universal hash functions and message authentication codes
based thereon.
It is define by TechTarget as:
An initialization vector (IV) is an arbitrary number that can be used along with a secret key
for data encryption. This number, also called a nonce, is employed only one time in any
session.
The use of an IV prevents repetition in data encryption, making it more difficult for a hacker
using a dictionary attack to find patterns and break a cipher. For example, a sequence
might appear twice or more within the body of a message. If there are repeated sequences
in encrypted data, an attacker could assume that the corresponding sequences in the
message were also identical. The IV prevents the appearance of corresponding duplicate
character sequences in the ciphertext.
The following answers are incorrect:
-Stream Cipher: This isn't correct. A stream cipher is a symmetric key cipher where plaintext digits are combined with pseudorandom key stream to product cipher text.
-OTP - One Time Pad: This isn't correct but OTP is made up of random values used as key material. (Encryption key) It is considered by most to be unbreakable but must be changed with a new key after it is used which makes it impractical for common use.
-Ciphertext: Sorry, incorrect answer. Ciphertext is basically text that has been encrypted with key material (Encryption key)
The following reference(s) was used to create this question:
For more details on this TOPIC and other questions of the Security+ CBK, subscribe to our Holistic Computer Based Tutorial (CBT) at http://www.cccure.tv and whatis.techtarget.com/definition/initialization-vector-IV and en.wikipedia.org/wiki/Initialization_vector
