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NEW QUESTION: 1
Timestamps and sequence numbers act as countermeasures against which of the following types of attacks?
A. Smurf
B. DoS
C. Replay
D. Vishing
Answer: C
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. A smurf attack is a type of network security breach in which a network connected to the Internet is swamped with replies to ICMP echo (PING) requests. A smurf attacker sends PING requests to an Internet broadcast address. These are special addresses that broadcast all received messages to the hosts connected to the subnet. Each broadcast address can support up to 255 hosts, so a single PING request can be multiplied 255 times. The return address of the request itself is spoofed to be the address of the attacker's victim. All the hosts receiving the PING request reply to this victim's address instead of the real sender's address. A single attacker sending hundreds or thousands of these
PING messages per second can fill the victim's T-1 (or even T-3) line with ping replies, bring the entire Internet service to its knees.
Smurfing falls under the general category of Denial of Service attacks -- security attacks that don't try to steal information, but instead attempt to disable a computer or network. Timestamps are not used to defend against this type of 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. Timestamps are not used to defend against this type of attack.
C. Vishing is the telephone equivalent of phishing. Vishing is the act of using the telephone in an attempt to scam the user into surrendering private information that will be used for identity theft. The scammer usually pretends to be a legitimate business, and fools the victim into thinking he or she will profit. Timestamps are not used to defend against this type of attack.
References:
http://en.wikipedia.org/wiki/Replay_attack
http://www.webopedia.com/TERM/S/smurf.html
http://www.webopedia.com/TERM/D/DoS_attack.html
http://www.webopedia.com/TERM/V/vishing.html
NEW QUESTION: 2
A customer is acquiring a POWER7+ system with 6 IBM i LPARs. A requirement exists to perform simultaneous backups of 3 of the partitions. Production schedules will cause the time of the backups to vary significantly on a daily basis.
Which configuration would support the requirements of the customer with least operator interaction?
A. Configure the system with 3 fibre tape adapters. Configure a tape library with 3 tape drives. Use
the HMC scheduler to move the adapters. Use BRMS and the BRMS network feature to manage
backups and media.
B. Configure an LPAR with 1 fibre tape adapter. Configure a tape library with 3 tape drives.
Use iSCSI to channel the 5 other LPARs through the LPAR that owns the fibre tape adapter Use
BRMS and the BRMS advanced function feature to manage backups and media.
C. Configure each LPAR with a fibre tape adapter. Configure a tape library with 3 tape drives.
Configure a fibre switch for tape library and drive connectivity Use BRMS and the BRMS network
feature to manage backups and media.
D. Configure a VIO Server (VIOS) LPAR with 1 fibre tape adapter. Configure a tape library with 1
tape drive.
Configure Virtual SCSI to enable each IBM i LPAR to connect to the VIOS. Configure backups to
use virtual tape catalogs hosted by VIOS.
Answer: C
NEW QUESTION: 3
内部監査人が実施するコンサルティング業務の範囲は次のとおりです。
A. その後の保証契約の対象となる可能性のある領域を除外します。
B. クライアントと合意した目的に十分に取り組む。
C. 現在の営業期間内の活動に限定されます。
D. コンサルティング契約の年間計画と併せて事前承認されます。
Answer: B
