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NEW QUESTION: 1
You need to recommend changes to the network Infrastructure that support the company's planned deployment of App5.
What should you include in the recommendation?
A. Implementation of IPSec
B. Implementation of IPv6 tunneling
C. Modifications to the existing DHCP infrastructure
D. Modifications to the existing DNS infrastructure
Answer: C
Explanation:
Explanation/Reference: You need to recommend an access strategy for the wireless network that meets the company's security requirements.

NEW QUESTION: 2
Click the Exhibit button.
Refer to the exhibit. Which Layer 2 feature detects a link failure between the switch and
router B that decreases OSPF reconvergence to approximately 50 milliseconds?
A. RSTP
B. BFD
C. UDLD
D. PVST+
Answer: B

NEW QUESTION: 3
SIMULATION
When might you need to migrate configuration changes?
Answer:
Explanation:
You might need to migrate customizations like apps, objects, code, reports or email
templates from a development sandbox to a training sandbox or production environment

NEW QUESTION: 4
Which of the following attacks could be used to initiate a subsequent man-in-the-middle attack?
A. Replay
B. Brute force
C. ARP poisoning
D. DoS
Answer: A
Explanation:
A replay attack (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by IP packet substitution (such as stream cipher attack).
For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of identity, which
Alice dutifully provides (possibly after some transformation like a hash function); meanwhile, Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is over, Eve (posing as Alice) connects to
Bob; when asked for a proof of identity, Eve sends Alice's password (or hash) read from the last session, which Bob accepts thus granting access to Eve.
Countermeasures: A way to avoid replay attacks is by using session tokens: Bob sends a one-time token to Alice, w hich Alice uses to transform the password and send the result to Bob (e.g. computing a hash function of the session token appended to the password). On his side Bob performs the same computation; if and only if both values match, the login is successful. Now suppose Eve has captured this value and tries to use it on another session; Bob sends a different session token, and when Eve replies with the captured value it will be different from Bob's computation.
Session tokens should be chosen by a (pseudo-) random process. Otherwise Eve may be able to pose as Bob, presenting some predicted future token, and convince Alice to use that token in her transformation. Eve can then replay her reply at a later time (when the previously predicted token is actually presented by Bob), and Bob will accept the authentication.
One-time passwords are similar to session tokens in that the password expires after it has been used or after a very short amount of time. They can be used to authenticate individual transactions in addition to sessions. The technique has been widely implemented in personal online banking systems.
Bob can also send nonces but should then include a message authentication code (MAC), which Alice should check.
Timestamping is another way of preventing a replay attack. Synchronization should be achieved using a secure protocol. For example Bob periodically broadcasts the time on his clock together with a MAC. When Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her message, which is also authenticated. Bob only accepts messages for which the timestamp is within a reasonable tolerance. The advantage of this scheme is that Bob does not need to generate (pseudo-) random numbers, with the trade-off being that replay attacks, if they are performed quickly enough i.e. within that 'reasonable' limit, could succeed.
Incorrect Answers:
A. Address Resolution Protocol poisoning (ARP poisoning) is a form of attack in which an attacker changes the Media
Access Control (MAC) address and attacks an Ethernet LAN by changing the target computer's ARP cache with a forged
ARP request and reply packets. This modifies the layer -Ethernet MAC address into the hacker's known MAC address to monitor it. Because the ARP replies are forged, the target computer unintentionally sends the frames to the hacker's computer first instead of sending it to the original destination. As a result, both the user's data and privacy are compromised. An effective ARP poisoning attempt is undetectable to the user.
ARP poisoning is also known as ARP cache poisoning or ARP poison routing (APR). ARP poisoning would not be used to initiate a subsequent man-in-the-middle attack.
B. DoS, short for denial-of-service attack, a type of attack on a network that is designed to bring the network to its knees by flooding it with useless traffic. Many DoS attacks, such as the Ping of Death and Teardrop attacks, exploit limitations in the TCP/IP protocols. For all known DoS attacks, there are software fixes that system administrators can install to limit the damage caused by the attacks. But, like viruses, new DoS attacks are constantly being dreamed up by hackers. DoS would not be used to initiate a subsequent man-in-the-middle attack.
D. A brute force attack is a trial-and-error method used to obtain information such as a user password or personal identification number (PIN). In a brute force attack, automated software is used to generate a large number of consecutive guesses as to the value of the desired data. Brute force attacks may be used by criminals to crack encrypted data, or by security analysts to test an organization's network security.
A brute force attack may also be referred to as brute force cracking.
For example, a form of brute force attack known as a dictionary attack might try all the words in a dictionary. Other forms of brute force attack might try commonly-used passwords or combinations of letters and numbers.
An attack of this nature can be time- and resource-consuming. Hence the name "brute force attack;" success is usually based on computing power and the number of combinations tried rather than an ingenious algorithm. A brute force attack would not be used to initiate a subsequent man-in-the-middle attack.
References:
http://en.wikipedia.org/wiki/Replay_attack
http://www.techopedia.com/definition/27471/address-resolution-protocol-poisoning-arp-poisoning
http://www.webopedia.com/TERM/D/DoS_attack.html
http://www.techopedia.com/definition/18091/brute-force-attack