Cloud Architecture
1.0 Network Fundamentals 1.1 Explain the role and function of network components 1.1.g Servers 1.2 Describe the characteristics of network topology architectures 1.2.f On-premises and cloud 1.12 Explain virtualization fundamentals (virtual machines)
It it has a variety of network access options; and it can be measured and billed back to the user based on can be requested on-demand; it can dynamically scale (that is, it is elastic); it uses a pool of resources; the amount used. Cisco Server Hardware Cisco expanded its product line into the server market, with the Cisco Unified Computing System (UCS) product line Server Virtualization Basics
The the settings for the VMhypervisor manages and allocates the host hardware (CPU, RAM, etc.) to each VM based on few of the vendors and product family names associated with virtualized data centers: ○ VMware vCenter ○ Microsoft HyperV
Ports connected to VMs or share the same VLAN with other VMs, or even use VLAN trunking to the VM itself.: The vSwitch can configure a port so that the VM will be in its own VLAN, Ports connected to physical NICs: that the switch is adjacent to the external physical LAN switch. The vSwitch can (and likely does) The vSwitch uses the physical NICs in the server hardware so use VLAN trunking. Automated configuration: virtualization software that controls the VMs. That programmability allows the virtualization The configuration can be easily done from within the same software to move VMs between hosts (servers) and reprogram the vSwitches so that the VM has the same networking capabilities no matter where the VM is running.
each host is cabled to two different switches in the top of the rackswitches—to provide redundant paths into the LAN. Each ToR switch acts as an access layer —called Top of Rack (ToR) switch from a design perspective. Each ToR switch is then cabled to an End of Row (EoR) switch, which acts as a distribution switch and also connects to the rest of the network.
Public Cloud
Software as a Service
(Development) Platform as a Service like IaaS in some ways. Both supply the consumer with one or more VMs, with a configurable amount of CPU, RAM, and other resources. includes many more software tools beyond the basic OS.
often include an integrated development environment (IDE) include continuous integration tools that allow the developer to update code and have that code automatically tested and integrated into a larger software project. Examples include Google’s App Engine PaaS offering (integrated development environment (see https://cloud.google.com/appenginewww.eclipse.org), and the Jenkins continuous ), the Eclipse integration and automation tool (see https://jenkins.io).
Pros and Cons with Connecting to Public Cloud with Internet good reasons to use the Internet as the WAN connection to a public cloud service: Agility to order a private WAN connection to the cloud provider because cloud : An enterprise can get started using public cloud without having to wait providers support Internet connectivity. Migration another more easily because cloud providers all connect to the Internet.: An enterprise can switch its workload from one cloud provider to Distributed user Internet with their devices (as in the sales SaaS app example).s: The enterprise’s users are distributed and connect to the negatives for using the Internet for public cloud access Security “man in the middle” can attempt to read the contents of data that passes : The Internet is less secure than private WAN connections in that a to/from the public cloud. Capacity traffic, so the question of whether the enterprise’s Internet links can handle the : Moving an internal application to the public cloud increases network additional load needs to be considered. Quality of Service (QoS): WANs can. Using the Internet may result in a worse user experience than The Internet does not provide QoS, whereas private desired because of higher delay (latency), jitter, and packet loss.
Cisco makes the that runs as a VM in a cloud service, controlled by the cloud consumer, to do various Cloud Services Router (CSR )to do exactly that: to be a router, but a router functions that routers do, including terminating VPNs. Pros and Cons of Connecting to Cloud with Private WANs
more secure
Pros
Cons Installing the new private WAN connections takes time, delaying when a company gets started in cloud computing cost more than using the Internet migrating to a new cloud provider can require another round of private WAN installation, again delaying work projects
you get the same benefits as when connecting with a private WAN connection to a public cloud, but with the additional pro of easier migration to a new cloud provider. The main con is that using an intercloud exchange introduces another company into the mix.
Migrating Traffic Flows When Migrating to Email SaaS
Branch Offices with Internet and Private WAN
16 Controller-Based Networking
1.0 Network Fundamentals
1.1 Explain the role and function of network components
1.1.f Endpoints
1.1.g Servers
1.2 Describe characteristics of network topology architectures
1.2.c Spine-leaf
6.0 Automation and Programmability
6.1 Explain how automation impacts network management
6.2 Compare traditional networks with controller-based networking
6.3 Describe controller-based and software defined architectures (overlay, underlay, and fabric)
6.3.a Separation of control plane and data plane
6.3.b Northbound and southbound APIs
SDN makes use of a controller that centralizes some network functions.
controllers enable programs to automatically configure and operate networks through power application programming interfaces (APIs).
The Data Plane
the tasks that a networking device does to forward a message.
anything to do with receiving data, processing it, and forwarding that same data
frame, a packet, or, more generically, a message
often called the forwarding plane.
actions that a networking device does that fit into the data plane:
De-encapsulating and re-encapsulating a packet in a data-link frame (routers, Layer 3
switches)