30 Questions
What is the primary concern related to tenants in traditional data centers?
Locked IP addresses
Why are subnets generally assigned different IP addresses in traditional data centers?
To guarantee location independence
What is a key advantage of having a tenant's IP address that can be taken anywhere?
Location-independent addressing
Why is it challenging to change the IP addresses of live running services in traditional data centers?
The complexity of changing topological locators
How do traditional data centers suffer from a lack of agility with tenants?
Locked IP addresses to topological locations
What is a significant benefit of having tenants with IP addresses independent of location?
Location-independent addressing flexibility
Where is the intelligence placed in a Software Defined Network (SDN)?
In a logically centralized location
What is the goal of a logically centralized controller in a Software Defined Network?
To simplify widely distributed switching gear
What does NOX represent in the context of Software Defined Networking (SDN)?
An early SDN controller
What does the logically centralized controller allow building on top of it in SDN?
Software abstractions
In SDN, what is used to identify a user's traffic and tag it with an identifier?
A VLAN tag
What type of interface is provided for the data plane in software-defined networking architectures?
Low-level interface and programmatic interface
What is the main goal of classifying traffic matrices into 40 categories of clusters?
To detect patterns in traffic matrices over time
In the context of network design, what is the purpose of a Clos topology?
To provide a richly-connected backbone with non-blocking properties
What failure characteristic was highlighted after analyzing 300K alarm tickets and 36 million error events?
0.4% of failures resolved in over one day
What characteristic of VL2 physical topology makes it well-suited for Very Large Backbone networks?
Use of two separate address families
Why is 'oblivious routing' used in network design based on the text provided?
To adapt to unpredictable traffic patterns efficiently
What distinguishes the Clos topology from traditional network design approaches like VL2?
Emphasis on scale-out rather than scale-up architecture
What is the stand-by cost of a VM at the edge node?
$0.03
What is the computing cost of a VM at the edge node?
$0.20
If the total number of VMs requested by the client at time slot $t=2$ is 100, how many VMs will be allocated from the private cloud?
70
What is the unit price of an on-demand instance in the public cloud?
$3.00
If the total number of VMs requested by the client at time slot $t=3$ is 200, how many VMs will be available at the edge node at the beginning of the fourth time slot?
180
What is the computing cost of the private cloud?
$3.00
What is the cost at the edge node for time slot (t = 1)?
$23.46
For time slot (t = 2), which type of instance is used in the public cloud?
On-demand instance
What is the cost at the edge node for time slot (t = 3)?
$19.08
What is the objective function for the Long-Term Optimal Resource Allocation problem?
$\sum_{t=1}^T C_t^{pub}$
How is the resource allocation problem modeled?
As a Markov Decision Process (MDP)
For time slot (t = 3), which type of instance is used in the public cloud?
Spot instance
Test your knowledge on resource allocation and pricing strategies in cloud computing, including stand-by costs, computing costs, unit prices of different cloud instances, and customization pricing. Practice calculations based on different cost values and allocation actions.
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