Cloud Virtualization NFV Networking

ROADM: Reconfigurable Add Drop Multiplexer traditionally used in conjunction with DWDM system, basically to convert Optical signan to Electrical signal. recently on order to selectively convert a single optical signal of a specific wavelength, it has been used. ROADM consist of 3 basic component 1. Wavelength selective switch 2. Amplifier  3. Channel Monitor Here you can see, ROADM are used to at both end to convert electrical signal in to optical Here you can see that electrical signal is further converted in by other network devices , Like Model Digital to Analog, Passed to firewall, router and switch inside a network and finally data is delivered to specific device/computer/system

Router: Layer 3 device of OSI model, deals with communication via IP address, Private Network, public network etc. routing protocols OSPF, etc are used, with concepts like routing tables. DNS: Domain Name server DHCP: Dynamic Host Configuration Protocol ======================================================================== NETWORKS , SUBNETWORKS and ROUTE                                   ROUTING TABLE  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface default             gateway             0.0.0.0         UG    100    0        0 em2 15.15.0.0       10.10.4.99      255.255.255.0   U...

Idea: Allow multiple types of data to travel over a same media, by using Mux and demux methodology SONET/SDH :  Electrical signal transmission WDM : Allot different signal a different wavelength Over optical fibre , laser lights travels over wire. Multiple wavelength lights dont interfere with each other while travelling in same media. Prims is used for multiplexing, multiple optical lights of different wavelength , with some angle adjustment, so that all lights come out of prism at same end point and travel straight in to fibre optic pipes. FDM: Allot different signal a different FREQUENCY TDM: Allot different signal a different Timeslot

QEMU: Its a virtul machine virtualization like Like : VMware, VirtualBox Its able to simulate/emulate new operating system in a operating system. Good performance than virtualbox: because it executes guest operating system code on the actual real cpu.

Kernel based Virtulization. Provided in all Linux type OS, with built in packages , like to jave KVM in RHEL6 yum install qemu-kvm qemu-img These packages provide the user-level KVM emulator and disk image manager on the host Red Hat Enterprise Linux system # yum install virt-manager libvirt libvirt-python python-virtinst libvirt-client python-virtinst: Provides the  virt-install  command for creating virtual machines. libvirt: to talk to RHEL KVM, via commands like "libvirtd" to VM mamager #virt-mamager &  a graphical tool of KVM to manage the VMS With virt-manager,  graphically step  by step wizard, you can create VMs, provide image , choose type of OS,. Take snapshot, revert back on any image, it's like a VCenter. #Daemon #libvirtd  use other commands on host mamanger like  #virsh list --all #virsh domaininfo <vmname> // info and confi of your vm   ...