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NEW QUESTION: 1
You have a Hyper-V server named Server1 that runs Windows Server 2012 R2.
Server1 hosts a virtual machine named VM1 that runs Windows Server 2016. VM1 connects to an external
virtual switch named Switch1.
You can ping VM1 from Server1.
You upgrade Server1 to Windows Server 2016.
You need to ensure that you can connect to VM1 by using PowerShell Direct.
What should you do?
A. Configure the firewall rules on VM1.
B. Enable the Hyper-V extensible switch extensions on Server1.
C. Configure the firewall rules on Server1.
D. Upgrade the configuration version of VM1.
Answer: D

NEW QUESTION: 2
Timestamps and sequence numbers act as countermeasures against which of the following types of attacks?
A. Vishing
B. DoS
C. Replay
D. Smurf
Answer: C
Explanation:
Explanation/Reference:
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, which 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.

NEW QUESTION: 3
展示を参照してください。

出力の2つの説明は正しいですか？
A. フェーズ2は、宛先サブネットへの経路があることを示しています。
B. ファイアウォールはデフォルトを使用して送信元IPアドレスに到達します。
C. すべてのパケットは許可されています。
D. 出力はpacket-tracerコマンドの実行から出力されます。
E. この出力はファイアウォールでshow captureコマンドを実行したことによるものです。
Answer: A,D

NEW QUESTION: 4
Which three are requirements when using vMotion to move a virtual machine across vCenter Server systems? (Choose three.)
A. Both vCenter Servers must have High Availability enabled on source and destination clusters.
B. Time must be synchronized.
C. Duplicate VM MAC addresses must be configured.
D. Both vCenter Servers must be using Enhanced Linked Mode.
E. Both vCenter Servers must be in the same Single Sign-On Domain.
Answer: B,D,E
Explanation:
Explanation/Reference:
Reference: https://kb.vmware.com/s/article/2106952