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NEW QUESTION: 1
The IEEE separates the Data Link and Physical ISO layers into four sub-layers. Based on the exhibit, what is the correct order of these sub-layers; from lowest to highest?


Answer:
Explanation:

Reference:
https://www.oreilly.com/library/view/ethernet-the-definitive/1565926609/ch01.html

NEW QUESTION: 2
Which of the following is not a disadvantage of symmetric cryptography when compared with Asymmetric Ciphers?
A. Large number of keys are needed
B. Provides Limited security services
C. Has no built in Key distribution
D. Speed
Answer: D
Explanation:
Symmetric cryptography ciphers are generally fast and hard to break. So speed is one of the key advantage of Symmetric ciphers and NOT a disadvantage. Symmetric Ciphers uses simple encryption steps such as XOR, substitution, permutation, shifting columns, shifting rows, etc... Such steps does not required a large amount of processing power compare to the complex mathematical problem used within Asymmetric Ciphers.
Some of the weaknesses of Symmetric Ciphers are: The lack of automated key distribution. Usually an Asymmetric cipher would be use to protect the symmetric key if it needs to be communicated to another entity securely over a public network. In the good old day this was done manually where it was distributed using the Floppy Net sometimes called the Sneaker Net (you run to someone's office to give them the key).
As far as the total number of keys are required to communicate securely between a large group of users, it does not scale very well. 10 users would require 45 keys for them to communicate securely with each other. If you have 1000 users then you would need almost half a million key to communicate secure. On Asymmetric ciphers there is only 2000 keys required for 1000 users. The formula to calculate the total number of keys required for a group of users who wishes to communicate securely with each others using Symmetric encryption is Total Number of Users (N) * Total Number of users minus one Divided by 2 or N (N-1)/2
Symmetric Ciphers are limited when it comes to security services, they cannot provide all
of the security services provided by Asymmetric ciphers. Symmetric ciphers provides
mostly confidentiality but can also provide integrity and authentication if a Message
Authentication Code (MAC) is used and could also provide user authentication if Kerberos
is used for example. Symmetric Ciphers cannot provide Digital Signature and Non-
Repudiation.
Reference used for theis question:
WALLHOFF, John, CBK#5 Cryptography (CISSP Study Guide), April 2002 (page 2).

NEW QUESTION: 3
会社は、すべてのネットワークリソースをAzureに移行することを計画しています。 Azureを探索して、計画プロセスを開始する必要があります。 最初に何を作成する必要がありますか？
A. a subscription
B. a management group
C. a virtual network
D. a resource group
Answer: A
Explanation:
The first thing you create in Azure is a subscription. You can think of an Azure subscription as an 'Azure account'. You get billed per subscription.
A subscription is an agreement with Microsoft to use one or more Microsoft cloud platforms or services, for which charges accrue based on either a per-user license fee or on cloud-based resource consumption.
Microsoft's Software as a Service (SaaS)-based cloud offerings (Office 365, Intune/EMS, and Dynamics 365) charge per-user license fees.
Microsoft's Platform as a Service (PaaS) and Infrastructure as a Service (IaaS) cloud offerings (Azure) charge based on cloud resource consumption.
You can also use a trial subscription, but the subscription expires after a specific amount of time or consumption charges. You can convert a trial subscription to a paid subscription.
Organizations can have multiple subscriptions for Microsoft's cloud offerings.
References:
https://docs.microsoft.com/en-us/office365/enterprise/subscriptions-licenses-accounts-and-tenants-for-microsoft-cloud-offerings